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Патент USA US2408201

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Sept. 24, 19%.;
J.,M.CUMMING ETAL
2,408,199
CIRCUIT BREAKER
Filed Sept. 15, 1941
2 Sheets-Sheet 1
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INVENTORS
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JamesM Cummin
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. R/C閘yG/?d C (?unm'lgzzam
Patented Sept. 24, 1946
2,408,199
UNITED STATES PATENT OFFICE
2,408,199
CIRCUIT BREAKER
James M. Cumming, Turtle Creek, and Richard
C. Cunningham, East Mclieesport, Pa., assign
ors to Westinghouse Electric Corporation, East
Pittsburgh, Pin, a corporation of Pennsylvania
Application September 13, 1941, Serial No. 410,686
?
17 Claims.
1
The invention relates to circuit breakers, and
more particularly to high speed circuit breaker
operating mechanisms of the pneumatic type.
High speed operation of circuit breakers is
becoming increasingly important, and circuit
(01. 175-294)
2
reclose the breaker and having an adequate ?uid
pressure exhausting means controlled by the cir
cuit breaker tripping means to provide for quick
and substantially unretarded opening of the
breaker and produce the effect of trip free action
breakers are now desired embodying operating
mechanisms which are capable of quickly re
Versing the switching movement of the contacts
without disconnecting the operating piston from
ing movement of the breaker to reclose the same
ping means so that a tripping impulse will al
the breaker.
Another object of the invention is the provision
in order to provide high speed opening of the
of a circuit breaker operating mechanism oper
contacts, and quick automatic reclosing of the 10 ated by compressed air to close or automatically
contacts immediately after interruption of a
reclose the breaker and having an improved air
short circuit. Automatic reclosing time can be
pressure exhausting means, for the operating
materially reduced by quickly reversing the open
cylinder, controlled by the circuit breaker trip
immediately after interruption of the circuit, par 15 ways take precedence over a closing impulse thus
ticularly if the reclosing movement is initiated
providing the effect of trip free action without
before the breaker reaches full open position.
disconnecting the main circuit breaker operating
It is also important that the breaker shall be
piston from the breaker.
opened quickly without substantial retardation
Another object of the invention is the provision
in response to an overload.
The movement of
the contacts must be reversed quickly to opening
movement without substantial retardation when
the breaker is being closed or automatically re
closed against a fault, even though the closing
air pressure is still being admitted to the oper
of a circuit breaker operating mechanism which
is pneumatically operated to close or automati
cally reclose the breaker and provided with a
main exhaust valve of the piston type which is
opened by air pressure under the control of a
light pilot valve operated by the armature of the
circuit breaker tripping means, whereby the ex
An object of the invention is the provision of
haust valve is caused to open by air pressure
a circuit breaker embodying an operating mech
in the operating cylinder at the same time the
anism operable by ?uid pressure to close the
circuit breaker is unlatched or tripped, Without
breaker and having an improved construction 30 adding an appreciable load on the circuit breaker
which will permit quickv reversal of operation of
tripping coil.
the breaker in either direction of movement.
Another object of the invention is the provision
Another object of the invention is the pro
of a circuit breaker operating mechanism oper
vision of a circuit breaker embodying an oper
able to close or quickly reclose the breaker by
ating cylinder.
ating mechanism pneumatically operated to close 35 ?uid pressure and having an exhaust passage
or automatically reclose the breaker, and having
larger than the main inlet passage and an ex
means for causing quick and substantially un
haust valve controlled by the circuit breaker
retarded opening of the breaker in response to
tripping means to provide trip free action, the
predetermined abnormal conditions in the circuit
exhaust passage being located in the operating
even if the abnormal condition occurs at the 40 cylinder so as to be closed by the main operating
instant the circuit is closed.
piston before it reaches the position at which
Another object of the invention is the pro
?uid pressure is admitted for quick reclosure thus
vision of a circuit breaker operating mechanism
preventing exhausting of the reclosing fluid pres
which. is operated by ?uid pressure to close or
sure and at the same time allowing a su?icient
automatically reclose the breaker, and means for 45 time interval for the mechanical closing of the
causing quick collapse of the closing fluid pres
exhaust valve on a quick reclosing operation.
sure in the operating cylinder upon the occur
Another object of the invention is the pro
rence of predetermined abnormal conditions in
vision of an improved circuit breaker operating
the circuit to cause quick and substantially? un~
mechanism of the pneumatic type, which is
retarded opening of the breaker in response to
simple, reliable in operation and inexpensive to
said condition even if the main inlet valve of
the mechanism is open at the time.
Another object of the invention is the provision
of a circuit breaker operating mechanism oper
manufacture.
ated by ?uid pressure to close or to automatically ~
itself, however, both as to structure and oper
The novel features that are considered char
acteristic of the invention are set forth in par
ticular in the appended claims. The invention
2,408,199
3
vantages thereof will be best understood from
the following detailed description of several em
bodiments thereof when read in conjunction with
the accompanying drawings, in which:
means of a high speed latching mechanism com
prising a main latch 5| which is pivoted on the
main casting 21 by means of a pivot pin 53. The
latch 5| is adapted to extend between the parallel
levers 31 and its latch end is adapted to engage
and restrain the roller 41 carried by the free end
of the breaker operating lever 35. The latch 5|
is biased to latching position against a stop 55
by means of a spring pressed plunger 51 which
engages a projection 59 of the latch. The plunger
Figure 1 is a vertical sectional view of a cir
cuit breaker operating mechanism embodying the
features of the invention, the mechanism being
shown in the closed position by the full lines;
Fig. 2 is a fragmentary sectional view, taken
substantially along the line IlI--II of Fig. 1, showing the exhaust valve of the mechanism, which
cannot be seen in the section of Fig. 1;
Fig. 3 is a wiring diagram of the circuits for
controlling opening and closing of the circuit
breaker, the operating mechanism and circuit
breaker being illustrated schematically in this
?gure; and
Fig. 4 is a fragmentary sectional View similar
to Fig. 2 but illustrating a modi?ed construction
4
35 is adapted to be held in the closed position,
shown in Fig. 1, to hold the breaker closed, by
ation together with additional objects and ad
51 is slidably mounted in an opening in a portion
of the main casting 21 and is biased inwardly
against the projection 59 of the latch 5| by means
of a compression spring 5| surrounding the
plunger 51 and disposed between the head thereof
and a plate 63 secured to the casting 21. An
adjustable nut 65 is threaded on the outer end
20 of the spring pressed plunger 51 and this nut
of the exhaust valve.
Referring to the drawings, the circuit breaker
1 shown schematically in Fig. 3, may be of any
conventional construction either of the oil break,
air break or gas blast type. The circuit breaker,
as shown, comprises stationary contact means 9
and cooperating movable contact means H for
controlling a main circuit represented diagram~
serves to limit inward movement or the plunger.
The construction of the latch face of the main
latch 5| is such that this latch alone will not serve
by itself to hold the breaker operating lever 35
in closed position unless the main latch is itself
? held in latching position.
An auxiliary latch 61
is provided for normally engaging and holding
the main latch 5| in latching position. The
auxiliary latch 61 is pivoted on the casting 21 by
matically by a single line |3. Although illustrated
means of a pivot pin 69 and has a latch projection
as a single pole circuit breaker, it will, of course, 30
1| which is adapted to engage under a tail pro
be understood that the breaker may be a multi
jection 13 of the main latch 5| in the latching
pole circuit breaker having a set of contact means
position of the latching means. The auxiliary
9?| | for each pole thereof with the movable con
latch 61 is biased to latching position, as shown
tact means mechanically connected for simulta
in Fig. 1, by a compression spring 15 which is
neous operation in the usual manner. The circuit 35
seated in a recess in the casting 21 and engages
breaker is biased to open circuit position by means
an integral projection of the auxiliary latch. The
of an accelerating spring shown schematically at
auxiliary latch 61 is also provided with a projec
l5, and the breaker is mechanically connected
tion 11 which extends directly over the upper end
to the operating mechanism indicated generally
of the trip plunger 19 of an electromagnetic trip
40
at l1 by suitable connecting means. The con
device 8|. The trip device 8| comprises in addi
necting means is represented schematically as
tion to the trip plunger 19, an E-shaped core 83
comprising a lever | 9 pivoted at 2| on a ?xed
of magnetic material, an energizing winding 85
support, one end of the lever being pivotally con
which
is mounted on the center leg of the E.
nected to the breaker lift rod 23 and the other
shaped core, and a movable armature E1 cooper
end being pivotally connected to the breaker
ating with the core 83. The trip plunger 19 is
operating rod 25 which is, in turn, mechanically
secured
to the center portion of the armature 81
connected to the operating mechanism l1.
and slidably extends upwardly through a guide
Referring now to Fig. 1, the operating mecha
opening in the center portion of the core 83 and
nism comprises a main casting 21 which is formed
through an opening in the horizontal portion of
50
to provide a cylinder 29 closed at the upper end
the main casting 21. The armature 81 is biased
by an integral part of the casting. A closure
downwardly to unattracted position, as shown in
member 3| is secured to the lower end of the
Fig. 1, by a compression spring 89 which encircles
cylinder 29 to close this end of the cylinder, and
the upper portion of the plunger 19 and is dis
this closure member has a relatively large port
33 therein which is open to the atmosphere. An 55 posed between a collar 9| secured to the plunger
and a bushing 93 which is threaded in the upper
operating or latching lever 35 is pivotally mounted
end of the opening of the casting through which
at one end on the casting 21. The operating lever
the
plunger extends. When the trip device 8|
consists of two spaced parallel levers 31 (only one
is energized, the armature 81 thereof is moved
being visible in Fig. l) which are pivotally con
upwardly against the core 83 causing upward
nected at one end by means of a pivot pin 39 to 60
movement of the trip plunger 19. This upward
the upper end of a pair of parallel links 4| (only
movement of the trip plunger causes the auxiliary
one appearing in Fig. 1) which are in turn piv
latch 1| to be rotated counterclockwise and dis
otally mounted on an car 43 of the main casting
engage the projection 13 of the main latch 5|,
21 by means of a pivot pin 44. The opposite end
whereupon the accelerating spring l5 of the cir
of the levers 31 comprising the operating lever
35 are connected by a cross member and carry a
short shaft 45 therebetween, on which is rotatably
mounted a roller 41 disposed between the parallel
levers 31. The breaker operating rod 25 is piv
otally connected by a pivot pin 49 to an inter
mediate point of the operating lever 35, the pivot
pin 49 extending transversely through the par
allel levers 31 and engaging an opening in the
lower end of the rod 25 which is disposed between
the parallel levers. The breaker operating lever 75
cuit breaker moves the breaker to open circuit
position, the operating lever 35 being rotated
counterclockwise about its pivoted end by the
opening movement of the breaker. During the
initial opening movement of the operating lever
35, the roller 41 forces the main latch 5| in a
counterclockwise direction as it clears the latch.
In order to prevent the auxiliary latch from being
returned to latching position until the breaker
operating lever 35 is returned to closed position
5
2,408,199
there is provided a U-shaped holding lever 95 the
legs of which are pivotally mounted on the ends
of the pivot pin 69 on opposite sides of the aux
iliary latch til. The holding lever 95 is biased
in a counterclockwise direction by the compres
sion spring 91 which is seated in a recess in the
casting 21 and engages a projection $9 of the
holding lever. A cross member ml of the holding
rounds the guide sleeve I 3|. The lower end of
the valve biasing spring I35 bears against the
spider legs of the bushing I33 and the upper end
of the spring bears against a, spring support I3?!
which is secured to the upper end of the valve
stem I29. The auxiliary air tank III is secured
to the underside of the valve housing II9 by
means of a plurality of bolts I39 (only one being
lever 95 is disposed directly beneath the end of
shown) which extend through the valve housing
the operating lever 35 so as to be held in inopera 10 i it and engage an annular ?ange MI formed on
tive position when the operating lever 35 is in
the. neck of the air tank III, thereby clamping
closed position. However, when the operating
the ?ange tightly against the underside of the
lever is released and moves toward open position,
valve housing H9. A sealing ring 543 is inter?
the holding lever 95 is rotated in a counterclock
posed between the valve housing and the ?ange
wise direction and a lateral extension I09: of the 15 MI of the auxiliary air tank iII to tightly seal
portion 99 of the holding lever engages and holds
the joint there-between. The auxiliary air tank
the auxiliary latch 61 in unlatched position until
i H is connected to a main air storage tank (not
the breaker operating lever 35 is returned to
shown) by moans of a conduit M5, compressed
closed position and its roller has become re
air being supplied to and maintained in the main
engaged by the latch face of the main latch 5i. 20 storage tank by a suitable motor driven com
For this purpose the biasing spring 91 of the hold
pressor unit, not shown.
ing lever is of greater strength than the auxiliary
The main inlet valve I21 is adapted to be
latch biasing spring ?I5.
opened by means of a valve piston I4?! to admit
An operating piston ")3 having piston rings N35
compressed air into the upper end of the oper
is movable within the operating cylinder 29 and ~
ating cylinder 2%} to? close or automatically reclose
this piston has a piston rod Ill?! which slidably
the circuit breaker. The valve piston I4?! is mov
extends in a ?uid tight manner through an open
ing provided therefor in the top wall of the cylin
der 29. The upper end of the piston rod Iiil has
able in a valve cylinder M9 formed in the valve
housing H9, and the valve piston is biased up
wardly to an. inoperative position against the
a connecting element H39 threadedly connected 30 head of the valve cylinder by means of a helical
thereto, which is pivotally connected to the? pivot
compression spring I5I which surrounds a por
pin 49 carried by the operating or latching lever
tion of a valve biasing spring and is disposed
35. Thus the operating piston I93 is mechanically
between the underside of the valve piston and a
connected directly to the circuit breaker oper
shoulder formed in the valve housing I IS.
ating rod 25. The purpose of the lever 35 is to
The valve operating piston M1 is adapted to
provide a mechanical advantage for the latching
be moved downwardly to open the main inlet
means to reduce the latch load, otherwise the
valve, by compressed air from the auxiliary air
lever 35 could be omitted and the latch arranged
tank Ill, through passages I52 and E53 formed
to latch directly on the operating rod. The oper
in the valve housing II 9, the valve piston Ill?!
ating piston IE3 is adapted to be moved down 40 being suitably recessed at its upper end, as shown
wardly in the cylinder 29 to close or automatically
in Fig. 1, for the purpose of permitting the com
reclose the circuit breaker, by compressed air
pressed air to move the piston downwardly from
from an auxiliary air reservoir or tank HI, the
its upper inoperative. position. The air passages
compressed air being admitted to the upper end
and I53 communicate with cooperating pas
of the operating cylinder 29 through an inlet : sages in the pilot valve housing I55 which is
passage controlled by a main inlet valve indicated
secured to the main valve housing H9. Com
generally at I � The opening operation of the
munication between. the auxiliary air tank and
main inlet valve is, in turn, controlled by a pilot
the upper end of the valve cylinder I 45 is nor
valve H5 operated by an electromagnet ill.
mally shut o?, however, by a pilot valve I51 dis
A skirt on the lower end of the operating piston
I03 cooperates with an annular recess I 84 formed
by the closure plate 3: to provide a dash pot
action to help in, stopping the piston at the end
of its downward or closing stroke.
The main inlet valve [l3 comprises av valve
housing I59 which is secured to the side of the
main cylinder casting 27 by a plurality of bolts
(not shown), and this valve housing is provided
with inlet passages I2 l and
the former com
municating with the auxiliary air reservoir Hi
and the latter communicating with an inlet port
I25 in the upper end of the main cylinder 25.
A main valve element 52?! disposed in the valve
guide
housing
sleeve
has '53.!
a stem
which
I25isslidably
carried mounted
by a bushing
in
I33. The bushing I33 is threaded in an opening
in the valve housing between the passages 12!
and 823, and this bushing serves as a valve seat
fer the valve element M27. The guide sleeve I35
is connected to the bushing :33 by a plurality of.
spider legs which permit the compressed air to
?ow through the passages iZI and
when the
valve is open. The valve element 522:? is biased
- posed in the pilot valve housing 555.
The pilot
valve I5?! is biased to closed position against its
seat by a compression spring I59 which bears
against the underside of the pilot valve. The
pilot valve is adapted to be operated to open posi
tion to cause air pressure to open the main inlet
valve, by means of the electromagnet I I?! upon
energization thereof.
The cylinder portion I49 of the main inlet
valve housing is provided with a plurality of ports
lid (only one being shown) adjacent the lower
end of the cylinder 549 which open to the atmos
phere. These ports function to prevent the main
inlet valve from being reclosed by the differential
pressure on the under side of the valve piston
I41 aided by they force of they springs I35 and I5!,
as the main inlet valve 22.?! opens.
A skirt on
the lower end of the valve piston M?! closes the
ports I555 as the piston I4?! reaches the bottom end
of its stroke to prevent any further leakage of
the closing air pressure through ports �. The
ports E50 also function to slowly exhaust the air
pressure in the operating cylinder 23 after the
completion of a normal closing operation.
to closed position, as shown in Fig. 1, by means
The electromagnet II?! comprises a frame, I6!
of a helical compression spring I 351- which sur 75
and a core I53 both of magnetic material, an
2,408,199
8
energizing winding I65, and a pivoted armature
I51. The electromagnet is secured to the pilot
valve housing I55 by the lower end of the core
I63 being threaded into an opening in the upper
of the operating cylinder 29 by a plurality of
bolts (not shown), and the exhaust passage I83
extends through the valve housing and is open to
the atmosphere at a port I88 on one side of the
end of the pilot valve housing I55, thus clamping
the winding spool and the frame IISI to the pilot
valve housing I85. The exhaust passage I83,
however, is normally closed by a piston type ex
Valve housing I55, the upper end of the core
I63 having a shoulder which bears against a plate
I59 which rests on the upper end of the winding
spool. The armature I51 of the electromagnet is
pivotally supported on the upper end of the frame
IBI, and this armature engages a plunger I1I
which extends slidably through an opening in the
center of the core I33, and the plunger is con
nected at its lower end to the pilot valve I51. 15
haust valve I39 which is slidably mounted in a
cylinder I9I formed in the exhaust valve hous
ing I85. The piston type exhaust valve I89 is
biased upwardly to closed position in which it
The pilot valve biasing spring I59 normally main
tains the pilot valve in closed position and the
closes the exhaust passage I83, by means of a
helical compression spring I93 disposed within
the valve cylinder. The upper end of the biasing
spring I93 bears against the underside of the top
of the piston valve I89 and the lower end of the
spring bears against the bottom closure plate
I55 01? the valve cylinder I9I, An annular guide
projection I91 is formed integral with the bottom
armature I61 in unattracted position. A casing
end plate I95 of the valve cylinder I9I and a co
I13 is secured to the plate I59 and frame I6I,
20 operating cylindrical shaped projection I99 is
and this casing encloses the armature I61.
formed on the inside of the piston I89. The pro
When the electromagnet H1 is energized, the
jections I91 and 199 serve as a guide for the bias
armature I61 thereof is moved to attracted posi
ing spring I93, and when the exhaust valve is
tion depressing the plunger Ill and thereby caus
moved downwardly to open position, the cylin
ing opening of the pilot valve I51 to admit com
drical projection I99 slides into the annular pro
pressed air from the air tank II I to the upper
jection I31 to provide a cushioning effect by the
end of the valve cylinder I49. The compressed
trapped air in the bottom of the annular projec
air ?owing into the upper end of the valve cylin
tion I31 at the end of the opening movement of
der through the passages I52 and I53 forces the
the exhaust valve I89. The exhaust ports I8I and
valve piston I41 downwardly, thereby causing
opening of the main inlet valve I21 to admit com 30 exhaust passage I83 are of a size sufficient when
the exhaust valve is open to cause quick col
pressed air to the upper end of the breaker oper
lapse of air pressure in the main operating cyl
ating cylinder 29. When the main inlet valve
inder 29 even though the main inlet valve I21
I21 is open, compressed air flows from the auxil
may be open. The exhaust passage and exhaust
iary air tank III, through the passages I2I and
I23 into the main operating cylinder 29 and 35 valve operate to quickly dump the air pressure
in the main operating cylinder 29 whenever the
quickly moves the operating piston I93 downward
trip device BI is operated, thus preventing any air
ly to closed position, thereby closing the circuit
pressure on the closing side of the main operating
breaker 1. As soon as the electromagnet II1 is
piston Hi3 from retarding opening movement of
deenergized, the pilot valve I 51 immediately closes
the circuit breaker when the circuit breaker is
and the main inlet valve I21 is quickly returned
called upon to open. Opening of the main ex
by its biasing spring I35 to closed position, the
haust valve IE9 is controlled by a pilot valve, in
valve operating piston I41 being also returned
dicated generally at ZBI, which is adapted to be
upwardly to its upper inoperative position by the
operated by the trip device 8I, Actual opening
spring I5I.
A push button I15 extends through the casing
I13 of the electromagnet and engages the arma
ture I61.
The push button I15 serves as a means
' movement of the main exhaust valve I89 is pro
duced by air pressure from the main operating
cylinder 29, when the pilot valve is opened by
the operation of the trip device 8|.
The exhaust pilot valve comprises a light pilot
for manually opening the pilot valve I51 to cause
a closing operation of the circuit breaker. The
electromagnet I I1 of the pilot valve I I5 is adapted 50 valve element 293 movable in an opening 294
provided therefor in the pilot valve housing 205
to be operated electrically to cause closing or
which is formed integral with the main operating
automatic reclosing of the circuit breaker by cir
cylinder casting 21. If desired the pilot valve
cuit means which will be hereinafter described.
housing 295 may be made as a separate casting
In order to provide for quick reversal of move�
secured to the cylinder 29. The pilot valve ele
ment of the operating piston I93 and circuit
ment 293 is directly mechanically connected to
breaker 1 (Fig. 3) to provide the effect of trip
the lower end of the trip plunger 19 which is con
free operation of the circuit breaker and to also
nected to and extends through the armature B1
provide for quick reclosing of the breaker, the
of the trip device. An air passage 291 formed in
operating cylinder 29 is provided with an air pres
the
cylinder casting 21 communicates with the
sure exhaust means for causing quick collapse of 60
main operating cylinder at one end and at the
air pressure in the cylinder 29 whenever the trip
other end with the valve opening 204, in which
ping device BI is operated, the exhaust passage
the pilot valve element 293 slides, The valve
of the exhaust means being so located that it is
opening 294 is in communication with a passage.
closed by the main operating piston before the
2II (Fig. 2) formed in a closure plate 2I2 which
piston reaches a position at which compressed
is secured to the bottom of the pilot valve hous
air is admitted for quick reclosure. The pres
ing 295. A conduit 2I3 (Fig, 2) connects the air
sure exhaust means comprises exhaust ports I8I
passage 2II to a recess 2I5 in the upper end of
formed in the side wall of the operating cylinder,
the exhaust valve cylinder I9l above the piston
indicated by the dotted lines of Fig. 1.
type main exhaust valve I89. The top of the
70
Referring to Fig. 2, the exhaust ports I8I in
main exhaust valve I89 is recessed, as shown in
the side of the main operating cylinder 29 com
Fig. 2, to permit the air pressure admitted
municate withv an exhaust passage I83 formed in
through the conduit 2I3 when the pilot valve is
the valve housing I35 of a main exhaust valve
opened, to initiate opening movement of the main
indicated generally at I81 (Fig. 2), The main
exhaust valve housing I85 is secured to the side 75 exhaust valve I89. As soon as the main exhaust
9
2,408,199
valve I89 is opened a small distance by air pres
sure through the conduit 2I3, the air pressure
?owing from the main operating cylinder 29,
through the exhaust passage I83 passes over the
top of the main exhaust valve I89 and the pres
10
which connects the circuit breaker operating rod
25 to the operating lever 55. The operating shaft
233 of the auxiliary switch device
is also con
nected by a crank 245 and a link 25? to the pro?
jection 239 of the auxiliary switch operating lever
sure quickly forces the main exhaust valve down
21?. Thus each of the auxiliary switch devices
wardly to open position and maintains it in open
225 and 22? is operated by and in accordance with
position against the force of the main exhaust
the movement of the circuit breaker '5'.
valve spring I93 until the pressure in the main
Referring now to Fig? 3 which diagrammati
operating cylinder 29 has collapsed to a prede 10
cally shows the circuits for electrically control
termined value whereupon the spring I93 imme
ling the inlet valve electromagnet II? and the
diately recloses the main exhaust valve. The air
trip device 8!. 25I and 253 designate a pair of
trapped in the annular projection I9'I by the
supply conductors connected to a source of elec
piston type projection I99 assists the spring I93
tric energy (not shown). The winding I65 of
in quickly returning the main exhaust valve to
closed position upon collapse of pressure in the
breaker operating cylinder. The biasing spring
the electromagnet Ill which controls the admis
sion of compressed air to the operating cylinder
for closing the circuit breaker, is connected in
an energizing circuit 255 extending from the sup
39 of the trip plunger 19 serves to return the ex
haust pilot valve 293 to closed position as soon
ply conductor 25I, through the Winding I55,
as the trip device BI is deenergized.
20 through back contacts 251 of a release relay 259
A port H9 is provided in the lower end of the
and front contacts 26! of an operating relay 293
exhaust valve cylinder I9I to permit opening of
the piston type main exhaust valve I89, the port
to the supply conductor 253.
The energizing
winding of the operating relay 263 is connected
2I9 being opened to the atmosphere to allow air
in an energizing circuit which extends from the
beneath the piston I99 to escape upon downward
supply conductor 253, through a conductor 295,
movement of the piston of the valve One or
back contacts 26'! of the release relay 259, ener
more small bleeder openings 22I are provided in
gizing winding of the operating relay 259, con
the top of the piston type main exhaust valve I89
ductor 259 and through a manual control switch
to prevent leakage air from the pilot valve 29I
2'? for controlling normal closing operation of
and from the main cylinder 29 from falsely oper 30 the circuit breaker, to the supply conductor 25L
ating the exhaust valve I89.
The energizing winding of the release relay 259
The exhaust ports I8! are located in the side
is connected in an energizing circuit which ex
wall of the cylinder 29 at a point intermediate
tends from the supply conductor 253, through an
the end positions of the operating piston H33 so
auxiliary switch 213 which is adapted to be closed
that these exhaust ports will be closed by the
when the circuit breaker reaches closed posi
main operating piston I03 after the ?breaker has
tion, through a conductor 215, energizing wind
opened a predetermined distance su?icient to in
ing of the release relay 259, conductor 21?.
terrupt the circuit and before the main operat
through the front contacts 2'58 of the operating
ing piston reaches the position at which com
relay 253 and through a conductor 219 to the
pressed air is admitted for quick automatic re
supply conductor 25I.
closing of the breaker. This arrangement pre
A stick circuit is provided for maintaining the
vents the dumping of the quick reclosing air pres
operating relay 253 energized after a momentary
sure and also allows a time interval for the me
operation of the manual closing control switch
chanical closing of the main exhaust valve �
2?. This stick circuit extends from the supply
on a quick reclosing operation of the mechanism.
conductor 253, through the conductor 255 and
The closing of the exhaust ports I8I by the pis
back contacts 267 of the release relay 259, ener
ton I93 also acts to provide a cushioning action
giZing winding of the operating relay 253, and
for the partial opening stroke of the breaker and
through a conductor 283, conductor 27?, front
piston during a quick reclosing operation. It
contacts 218 of the operating relay and conduc
will thus be seen that the pressure exhaust means .
tor 279 to the supply conductor 25!. A locking
in addition to providing trip free action to per
circuit is also provided for maintaining the re
mit quick reversal of switching movement during
lease relay 259 energized until the manual clos
closing or reclosing and substantially unretarded
ing control switch 2'? has been opened. This
opening movement of the breaker, also provides
locking circuit for the relay 259 extends from
for quick reversal of the opening movement dur
the supply conductor 253, through a portion of
ing a quick reclosing operation by preventing the
the conductor 265, front contacts 285 of the re
dumping of the reclosing air during the initial
portion of the reclosing operation, before the ex
lease relay 259, energizing winding of release re
lay 259, conductor 283, conductor 299 and the
manual closing control switch 2'? to the supply
A pair of auxiliary switch devices 225 and 22'! 60 conductor 25 I.
is mounted on a bracket 229 secured to the main
The winding 85 of the trip device BI is con
casting 27. Each of these auxiliary switch de
nected in an energizing circuit which extends
vices comprises a multi-pole auxiliary switch of
from the supply conductor 253, through conduc
conventional construction, wherein the individ
tor 287, through an auxiliary switch 299 which is
haust valve I91 closes.
ual switch poles are adjustable relative to their
operating shafts 23I and 233, respectively, where?
closed when the circuit breaker is closed, con
ductor 29I, energizing winding 95 of the trip
by the auxiliary switches may be set to operate
device
8i, conductor 293 and the contacts 295
at predetermined desired points in the operation
of a fault responsive relay 29? and through a
of the main circuit breaker ?I. The operating
conductor 299 to the opposite supply conductor
shaft 23! of the auxiliary switch device 225 is 70 25L The fault responsive relay 291 is arranged
connected by a crank 235 and link 231 to the pro
to be operated to close its contacts 295 upon the
jection 239 of an auxiliary switch operating lever
occurrence of a predetermined overload, such,
MI. The lever 24I is pivotally mounted on the
for example, as a short circuit in the main cir
?xed pivot pin 53 and the free end of this lever
cuit
I3 controlled by the circuit breaker ?I. For
is connected by a slot 249 to the pivot pin 49 75 this purpose,
the energizing winding of the pro
2,408,199
11
tective relay 291 is arranged to be energized by
a current transformer 39! associated with the
main circuit conductor !3. Thus when a prede
termined overload condition or short circuit oc~
ours in the main circuit !3 controlled by the
12
closing the adjustable" auxiliary switch 3l1. The
contacts 3!9 of the fault responsive relay are
closed simultaneously with the contacts 295 upon
operation of the fault responsive relay in re
sponse to an overload or short circuit, thus im
breaker ?I, the fault responsive relay 291 becomes
energized a suflicient amount to close its contacts,
thereby effecting energization of the trip de
vice 8!. When the trip device 8! is energized, it
mediately preparing the energizing circuit for
the reclosing relay 391. During the initial open
circuit breaker operating lever 35, whereupon the
circuit breaker is quickly moved to open position
by its biasing springs.
relay 391 thereupon closes its contacts 399, com
pleting an energizing circuit for the operating
relay 263, this energizing circuit extending from
the supply conductor 25!, through the contacts
399 of the reclosing relay, conductor 3!!, con
ductor 269, energizing winding of operating re
lay 263, back contacts 261 of the release relay
259, and conductor 265 to the opposite supply
ing movement of the circuit breaker, the aux--v
iliary switch 3!1 closes and completes the ener
causes release of the latching means 5!, 1! and 10 gizing circuit for the reclosing relay 391', and the
The circuit breaker 1 may also be tripped open
manually by means of a manually operable trip
control switch 303 connected in series with a
conductor 395 which is arranged to shunt the
contacts 295 of the protective relay 291.
conductor 253. The operating relay instantly
The circuit breaker 1 is adapted to be auto
matically reclosed immediately following inter 20 closes its contacts 218 and 23!. Closing of the
operating relay contacts 26! completes an ener~
ruption of the circuit by the circuit breaker 1,
gizing circuit for the inlet valve controlling elec
through the agency of a reclosing relay 391.
tromagnet l!1, through the back contacts 251
Automatic reclosing movement of the circuit
of the release relay, and through conductor 255.
breaker is preferably initiated immediately after
the circuit breaker has interrupted the circuit 25 The electromagnet I !1 when energized opens the
pilot valve _!51, thereby causing opening of the
and before the circuit breaker reaches full open
main inlet valve !21. Compressed air is there
position. Reclosing relay 391 has its contacts
upon admitted to the upper end of the operating
309 connected in series with a conductor 3!!
cylinder 29 quickly moving the operating piston
which is connected in shunt relation to the con
tacts 0f the manual closing control switch 21!. 30 ma downwardly to close the circuit breaker.
These operations occur substantially instan
taneously so that reclosing movement of the
operating piston is initiated immediately after
the circuit has been interrupted and before the
The energizing winding of the reclosing relay 35 breaker reaches the full open position. The po
sition at which automatic reclosing movement of
301 is connected in series in an energizing circuit
the main operating piston I93 takes place is in
3!5 which extends from the supply conductor
dicated by the dotted lines R in Fig. 1. As has
253, through the winding of the reclosing relay
previously been explained, the exhaust ports !8!
301, through an adjustable auxiliary switch 3l1
are located in a position such that they are
which is adjusted to close during the initial open
closed by the operating piston I03 during the
ing movement of the circuit breaker, and through
?rst part of the opening movement of the breaker
contacts 3!9 of the protective relay 291 and con
before the piston reaches the position at which
ductor 299 to the opposite supply conductor 25!.
compressed air is admitted for quick reclosure,
The operation of the mechanism is as follows,
so that dumping of the reclosing air is thereby
assuming the circuit breaker to be in closed po
prevented and the exhaust valve [89 is given a
sition, as shown in Figs. 1 and 3. When a pre
time interval to mechanically close before the
determined overload or short circuit occurs in
downward movement of the operating piston
the main circuit !3 controlled by the circuit
opens the exhaust ports !8!.
breaker 1, the fault responsive relay 291 is im
Closing of the contacts 218 of the operating
mediately energized and closes its contacts 295
relay 263 prepares an energizing circuit for the
to e?ect energization of the trip device 8 I. When
release relay 259. This circuit extending from
the trip device 8! is thus energized, it moves the
the supply conductor 25!, through conductor 219,
trip plunger 19 upwardly to cause the auxiliary
contacts 218, conductor 211, energizing winding
latch 61 to release the main latch 5!, thereby
releasing the breaker operating lever 35. The - of the release relay 259, conductor 215 to the aux
iliary switch 213 which closes the instant the cir
circuit breaker is immediately moved to open po
cuit breaker reaches closed position. As soon
sition by its biasing spring !5. The operation
as the circuit breaker reaches closed position, the
of the trip plunger 19 also opens the pilot valve
auxiliary switch 213 completes the energizing
293, thereby causing the main exhaust valve to
circuit for the release relay 259, whereupon the
be opened and quickly exhaust any air pressure
release relay operates to open its back contacts
in the operating cylinder 29, if there is any pres
A manually operable switch 3i3 is provided in
the conductor 3!! for the purpose of preventing
quick automatic reclosing operation of the cir~
cuit breaker if automatic reclosing is not desired.
sure in the cylinder 29 at this time.
The main
circuit I3 is interrupted during the ?rst part of
the opening movement of the circuit breaker 1
by the time the circuit breaker has opened
through only a part of its full open distance.
Assuming the manual switch 3l3 to be closed,
quick automatic reclosing operation of the circuit
261 and 251 and closes its front contacts 285.
The opening of contacts 251 effects deenergiza~
tion of the inlet valve controlling electromagnet
!!1, thereby causing shutting off the supply of
compressed air to the operating cylinder 29, and
the opening of contacts 231 e?ects deenergization
of the operating relay 263. The closing of the
front contacts 285 normally produces no effect
breaker will be caused to take place as soon as
the circuit breaker has opened through a prede 70 during quick automatic reclosing operation, since
the contacts 399 of the reclosing relay open be
termined distance, less than the full open dis
fore the breaker reaches closed position.
tance, Quick automatic reclosing operation of
If the condition which caused the overload or
the circuit is accomplished by the reclosing relay
short circuit has been removed by the time the
301 in response to closing of its circuit by the
contacts 3l9 of the fault responsive relay 291 and 75 circuit breaker completes the circuit upon a quick
13
2,408,199
14
automatic reclosing operation, the circuit breaker
tacts 285 and energizing winding of the release
relay 259, conductor 283, conductor 269 and man
ual closing control switch 21! to the supply con
ductor 25 I. This locking circuit thus prevents the
circuit breaker from pumping if the breaker will
remains closed and the control circuits assume
the normal condition shown in Fig. 3. However,
if the fault condition which causes the overload
or short circuit is still present at the time the
circuit is completed by the contacts of the circuit
not remain closed and the manual control switch
breaker during a quick reclosing operation there
is held in closed position. If the circuit breaker
of, the fault responsive relay 23?! is again ener
should be closed against an overload or short cir
gized the instant the main circuit is completed
cuit during a normal closing operation, the trip
again causing energization of the trip device 8!. 10 device 8! will be operated to release the latch
Consequently trip plunger 19 is again operated.
and cause opening of the exhaust valve !81 so
upwardly opening the pilot valve 203, thereby
that the breaker will immediately open even
causing the air pressure in the operating cylinder
though the inlet valve I89 may be opened at the
29 to open the main exhaust valve I89 and quickly
time the circuit is completed.
cause collapse of the air pressure in the operat 15
The circuit breaker may be manually tripped
ing cylinder 29 even though the main inlet valve
open by closing the manual trip control switch
!2'! may still be open at this time. The trip de
303 which effects energization of the trip device
vice 8| also moves the latches to released posi
8! and tripping of the circuit breaker.
tion. Thus the circuit breaker is caused to
A modi?cation of the main exhaust valve is
quickly reverse its movement and start opening
illustrated in Fig. a. The construction of this
even though the inlet valve may be open at this
modi?ed form of the exhaust valve is substan
time. The opening movement of the circuit
tially the same as that shown in the original em
breaker is substantially unretarded due to the
bodiment, except that the valve cylinder is open
quick collapse of air pressure in the operating
at its lower end and the lower end of the valve
cylinder 29. A lockout device 32! of any con 25 biasing spring is mechanically connected to the
ventional construction may be provided in the
auxiliary switch operating lever 24%. Referring
circuit of the reclosing relay 3!]? to prevent more
to Fig. 4, the modi?ed exhaust valve comprises a
than one quick automatic reclosing operation of
valve housing 325 secured to the side of the main
the circuit breaker, or to open the quick reclosing
operating cylinder 29. The valve housing is
circuit and transfer control of the reclosing relay
formed to provide a valve cylinder 32? which is
to a time delayed reclosing device in a manner
open at its lower end, and the housing contains
well known in the art. If the lockout device 32!
the exhaust passage 329 which is open to the at
is of a character to provide for only a single
quick automatic reclosure of the circuit breaker,
the circuit breaker proceeds to the full open posi
mosphere at one end and communicates at its
35
tion and remains open after one unsuccessful
other end with the exhaust ports Hit of the op
erating cylinder 29. The exhaust valve 33! is a
piston type valve which is slidably mountedv in
attempt at quick reclosure.
the valve cylinder 32?. The valve 33! is biased
Normal closing operation of the circuit breaker
upwardly to closed position to close the exhaust
from the full open position is accomplished by
passage 329 by means of a helical biasing spring
closing the manual control switch 21!. The clos 40
the upper end of which bears against the
ing of this switch completes an energizing circuit
underside of the piston type exhaust valve. The
for the operating relay 263. When the operating
lower end of the spring 333 bears against a spring
relay is thus energized, it closes its contacts 26!
support 335 which is carried by a connecting rod
and 218, the closing of contacts 26! completing
33?. The connecting rod 331 slidably extends
an energizing circuit for the inlet valve control
' through openings provided in the valve 33! and
ling electromagnet H1, thereby causing com
valve housing 325, and the upper end of the con
necting rod is pivotally connected at 338 to the
pressed air to be admitted to the operating cyl
inder to close the circuit breaker. The contacts
218 prepare an energizing circuit for the release
relay 259, this circuit being completed by the aux
iliary switch 213 when the breaker reaches the
fully closed position. The manual closing con
trol switch 21! need only be closed for an instant
because as soon as the operating relay closes its
contacts 218, a stick circuit is completedv for
maintaining the operating relay energized until
the release relay operates. This stick circuit has
been previously described. Closing of the con
tacts 218 of the operating relay 263 prepares an
auxiliary switch operating lever 26!. The upper
end of the valve cylinder 32'! has a passage 2I5
in
which is connected by conduit 2!?� to the pilot
valve passage 2! l in the same manner as shown
and described in connection with the original
embodiment, and the upper end of the piston type
valve 33! is provided with a recess so that com
pressed air admitted through the conduit 2!3 to
the upper end of the cylinder can initiate open
ing of the exhaust valve 33!. The purpose of
connecting the lower end of the valve biasing
spring to the auxiliary switch operating lever 24!
energizing circuit for the release relay 259 which 60 is to provide for additional compression of the
is completed by the auxiliary switch 213 when
spring as the circuit breaker operating mecha
the breaker reaches the fully closed position.
nism opens in order to insure quick closing of the
When the release relay 259 is energized, it opens
exhaust valve and to prevent the valve from stick
its back contacts 25?! and 261, thereby deenergiz
_ ing open after the air in the breaker operating
ing the inlet valve controlling electromagnet I !'l
cylinder has been exhausted. The remaining
by the contacts 25?! and also deenergizing the
structure of the exhaust valve and its function
operating relay 263 by the contacts 26?! and .pre
is substantially the same as in the case of the
venting further energization of the operating re
original embodiment.
lay as long as these contacts remain open.
The
While the invention has been disclosed in ac
operation of the release relay also closes its front 79 cordance with the provisions of the patent stat
contacts 285 to complete a locking circuit for
utes, it is to be understood that various changes
maintaining the release relay energized as long
in the structural details and arrangements of
as the manual closing control switch 21! is held
parts thereof may be made without departing
closed, this locking circuit extending from the
from some of the essential features of the inven
supply conductor 253, through the front con 75 tion.
2,408,199
15
We claim as our invention:
1. In combination, a circuit breaker biased to
open circuit position, operating mechanism there
for comprising an operating cylinder, a piston in
said cylinder operatively related to the breaker,
a source of compressed air for operating said
piston to close the breaker, means including an
inlet valve operable to connect said source of com
16
ton reciprocable in said cylinder for actuating
the breaker, a source of compressed air for
operating said piston, an inlet valve operable to
connect one end of said cylinder to said source
of compressed air to close the breaker, means
operable to cause opening of the breaker, an
electromagnet having an armature operable in
response to the occurrence of predetermined ab
normal conditions to cause operation of said
pressed air to said cylinder to close the breaker,
latching means for releasably holding said breaker 10 means to open the breaker, an air pressure ex
haust passage communicating with said oper
closed, trippintT means operable in response to
ating cylinder of a size to cause quick collapse
predetermined abnormal conditions in the circuit
of pressure in said operating cylinder on the
to cause said latching means to release the
closing side of said piston even though said inlet
breaker and thereby cause opening of the breaker,
valve is open, a piston type exhaust valve in said
air pressure exhaust means connected to said
passage biased to normally close said passage,
cylinder intermediate its ends so as to be closed
off by said piston when in an intermediate posi
tion, said exhaust means including a normally
closed exhaust valve directly connected to said
cylinder apart from the connection to said source
of compressed. air, said valve when opened caus
ing quick collapse of pressure in said cylinder
except when said piston is at or to one side of
said exhaust valve being operable to open posi
tion to open said passage when air pressure is
applied to one end of the piston of said valve,
the circuit to cause said latching means to re
having an armature operable upon the occur
of the breaker, air pressure exhaust means asso
the circuit to cause said latching means'to release
the breaker and thereby cause opening of the
breaker, a pressure exhaust passage communi
eating with said cylinder of a size to cause quick
collapse of pressure in said cylinder when said
passage is open, a piston type exhaust valve in
said passage normally biased closed to close said
an auxiliary air passage connecting a portion
of said operating cylinder with said one end of
said piston valve, a pilot valve in said auxiliary
passage biased to close said passage, said pilot
valve being connected to the armature of said
said intermediate position, and means operated
by said tripping means upon operation thereof 25 electromagnet to be opened thereby when said
armature is operated to thereby cause opening
for causing opening of said exhaust valve.
of said exhaust valve by air pressure in said
2. In combination, a circuit breaker biased to
cylinder.
open circuit position, operating mechanism there
5. In combination, a circuit breaker biased to
for comprising an operating cylinder, a piston in
said cylinder operatively related to the breaker, 30 open circuit position, operating mechanism
therefor comprising an operating cylinder, a pis
a source of compressed air for operating said
ton in said cylinder connected to the breaker,
piston to close the breaker, means including an
a source of compressed air for operating said
inlet valve operable to connect said source of
piston to close the breaker, means including an
compressed air to said cylinder to close the
breaker, latching means for releasably holding 35 inlet valve operable to connect said source of
compressed air to said cylinder to close the
said breaker closed, a tripping electromagnet
breaker, latching means for releasably holding
having an armature operable upon the occur
said breaker closed, a tripping electromagnet
rence of predetermined abnormal conditions in
lease said breaker and thereby cause opening 40 rence of predetermined abnormal conditions in
ciated with said operating cylinder including an
exhaust valve biased closed and having a piston
Operable by air pressure to open said valve, said
exhaust valve when opened causing quick collapse
of pressure in said breaker operating cylinder,
and means including a normally closed pilot valve
operable by the armature of said tripping electro
magnet upon operation thereof to cause opening
of said exhaust valve.
3. An operating mechanism for a circuit
breaker comprising an operating cylinder, a pis
ton reciprocable in said cylinder for actuating the
breaker, a source of compressed air for operating
said piston, an inlet valve operable to connect .
one end of said cylinder to said source of com
passage, said exhaust valve being operable to
open position when a predetermined air pressure
is applied to one end of the piston of said valve,
an auxiliary air passage connecting a portion
of said cylinder with the exhaust valve housing
adjacent said one end of the valve piston, a pilot
valve in said auxiliary passage biased to nor
mally close said passage, said pilot valve being
connected to the armature of said tripping elec
tromagnet to be opened thereby when said arma
ture is operated to thereby cause opening of
said exhaust valve by air pressure in said
pressed air to close the breaker, means operable
to cause opening of the breaker, an electromagnet
having an armature operable in response to the
occurrence of predetermined abnormal conditions 60 cylinder.
to cause operation of said means to open the
6. In combination, a circuit breaker biased to
breaker, air pressure exhaust means associated
with said operating cylinder including an exhaust
valve biased closed and having a piston operable
by air pressure to open said exhaust valve, said
exhaust means when said exhaust valve is open
causing quick collapse of air pressure in said cyl
inder on the 1closing side of said breaker operating
open circuit position, operating mechanism there
for comprising compressed air operated closing
piston when said breaker-operating piston is in
breaker and thereby cause opening of the breaker,
means automatically operable to initiate an in
or adjacent closed position, and a normally closed
pilot valve operable by the armature of said elec- ,
tromagnet upon operation thereof to cause open
ing of said exhaust valve.
4. An operating mechanism for a circuit
breaker comprising an operating cylinder, at pis 75
means for closing the breaker, latching means
for releasably holding said breaker in closed cir
cuit position, tripping means operable in response
to predetermined abnormal conditions in the cir
cuit to cause said latching means to release the
stantaneous reclosing operation of the closing
means after interruption of the circuit and at
least by the time the breaker reaches full open
position, air pressure exhaust means associated
with said closing means including a normally
17
2,408,199
closed exhaust valve operable to cause a quick
collapse of closing air pressure in said closing
means, said tripping means when operated caus
ing opening of said exhaust valve, and means
responsive to the position of said closing means
for mechanically closing said exhaust ,means
when said closing means is in the neighborhood
of its open position.
18
closed, tripping means operable upon the occur
rence of predetermined overload conditions in the
circuit to cause said latching means to release
the breaker and thereby cause opening of the
breaker, a pressure exhaust passage communi
eating with said cylinder of a size sufficient to
cause quick collapse of pressure in said cylinder
when said passage is open even if said inlet valve
is
an exhaust valve in said passage biased
mechanism 10 to open,
normally close said passage, means operated
7. In combination, a circuit breaker biased to
open circuit position, operating
therefor comprising an operating cylinder, a
piston in said cylinder operatively related to said
substantially simultaneously with said tripping
means for causing opening of said exhaust valve,
said exhaust passage being closed by a part mov
breaker, a source of compressed air, an inlet
valve operable to connect said source of com?
able in accordance with the movement of said
pressed air to one end of said cylinder to effect 15 piston
when said piston is within a predetermined
closing of the breaker, latching means for re
leasably holding said breaker closed, tripping
means operable upon the occurrence of prede
termined overload conditions in the circuit to
distance of the full open position.
10. In combination, a circuit breaker biased to
open
circuit position,
operating mechanism
therefor comprising an operating cylinder, a
cause said latching means to release� the breaker 20 piston movable in said cylinder and operatively
and thereby cause opening of the breaker, means
related to said breaker, a source of compressed
operable to automatically open said inlet valve
air, means including an inlet valve for connect
to cause, said operating piston to initiate reclos
ing one end of said cylinder to said source of
ing of the breaker after interruption of the circuit
compressed air to effect closing of the breaker,
and before said breaker reaches the full open
latching means for releasably holding said
position, an air pressure exhaust passage com
breaker closed, tripping means operable upon
municating with said cylinder at a point inter
the occurrence of predetermined overload condi
mediate its ends, said exhaust passage being of
tions in the circuit to cause said latching means
a size su?icient to cause quick collapse of pres
sure in said cylinder even if said inlet valve is 30 to release the breaker and thereby cause opening
of the breaker, a pressure exhaust passage com
open when the piston is near the end of its
municating with said cylinder through the side
stroke opposite the inlet end of the cylinder and
wall thereof at a point intermediate the ends
said exhaust passage being closed off from the
thereof, said passage being of a size sufficient
inlet when the piston is between said interme
to cause quick collapse of pressure in said cylinder
diate point and the inlet end of the cylinder
when said passage is open, an exhaust valve in
sov as to permit quick reclosing of the breaker
said
passage normally biased closed, means oper
before reaching full open position, an exhaust
ated
by said tripping means upon operation
valve in said passage biased to normally close
thereof for causing opening Of said exhaust valve,
said exhaust passage, and means operated by
said tripping means upon operation thereof to 40 said operating piston closing communication be
tween a portion of said cylinder and said ex
cause opening of said exhaust valve.
haust passage when the breaker is opened more
8. In combination, a circuit breaker biased
than a predetermined distance to permit quick
to open circuit position operating mechanism
reclosing operation of the breaker and allow said
therefor comprising an operating cylinder, a
exhaust valve to close during a quick reclosing
piston movable in said cylinder and operatively
operation.
related to said breaker, a source of compressed
11. An operating mechanism for a circuit
air, means including an inlet valve for connect
breaker comprising an operating cylinder, - a
ing one end of said cylinder to said source of
piston in said cylinder operatively related to the
compressed-air to effect closing of the breaker,
a source of compressed air for actuating
latching means for releasably holding said 50 breaker,
said
piston,
means including an inlet valve oper
breaker closed, tripping means operable upon
able to connect one end of said cylinder to said
the occurrence of predetermined overload condi
source of compressed air to effect closing of the
tions in the circuit to cause said latching means
breaker,
latching means for releasably holding
to release the breaker and thereby cause open
ing of the breaker, a pressure exhaust passage 55 the breaker closed, tripping means operable upon
the occurrence of predetermined overload condi
communicating with said cylinder through the
tions to cause said latching means to release the
side Wall of the cylinder at a predetermined point
breaker and thereby cause opening of the
intermediate the end positions of said piston,
breaker, a pressure exhaust passage communi
said passage having a size such as to cause a
quick collapse of pressure in said cylinder when 60 cating with said cylinder through the side Wall
thereof, said passage being of a size sufficient
said passage is open even if said inlet valve is
when said passage is open to cause quick col
open, an exhaust valve in said passage normally
lapse of pressure in said cylinder even if said
biased closed to close said exhaust passage, and
inlet
valve is open, a piston type exhaust valve
means operated by said tripping means upon
in
said
passage biased to normally close said
operation thereof for causing opening of said 65
passage, means operated substantially simulta
exhaust valve.
neously with said tripping means for causing said
9. In combination, a circuit breaker biased to
exhaust valve to be opened by air pressure in
open circuit position, operating mechanism
said cylinder, said operating piston closing said
therefor comprising an operating cylinder, a
piston movable in said cylinder and operatively 70 exhaust passage off from a portion of the cylinder
when said breaker has opened a predetermined
related to said breaker, a source of compressed
amount less than the full opening distance.
air, means including an inlet valve for connecting
12. An operating mechanism for a circuit
one end of said cylinder to said source of com
breaker comprising an operating cylinder, a
pressed air to effect closing of the breaker, latch
piston in said cylinder operatively related to the
ing means for releasably holding said ?breaker 75 breaker, a source of compressed air for actuating
aroma;
19
20
cause said latching means to release the breaker
said piston to close the breaker, means including
and thereby cause opening of the breaker, means
automatically operable to open said inlet valve
to initiate a quick automatic reclosing operation
of the breaker after interruption of the circuit
but before said breaker reaches full open posi
tion, a ?uid pressure exhaust passage communi
an inlet valve operable to connect one end of
said cylinder to said source of compressed air
to effect closing of the breaker, means operable
to cause opening of the breaker, an electromag
net having an armature operable upon the occur
rence of predetermined overload conditions in the
eating with said cylinder at a point intermediate
the end positions of said piston, said passage
circuit to cause operation of said means to open
the breaker, a pressure exhaust passage com
being of a size suf?cient when said passage is
open to cause quick collapse of fluid pressure
municating with said cylinder, said passage being
of a size sufficient when said passage is open to
cause quick collapse of pressure in said cylinder
?even if said inlet valve is open, a piston type
exhaust valve in said passage, spring means for
in said cylinder even if said inlet valve is ?open,
a piston type exhaust valve in said passage biased
by a spring to normally close said passage,
means operated by said tripping means upon
biasing said exhaust valve to normally close said
passage, means operated by the armature of said
electromagnet upon operation thereof to cause
said exhaust valve to be opened by air pressure
in said cylinder, and a connection between said
operation thereof for causing said exhaustrvalve
to be opened by ?uid pressure in a portion of
said cylinder, said breaker operating piston acting
to close off communication between said exhaust
passage and a portion of the operating cylinder
spring means and a part movable with said 20
after said breaker has opened a predetermined
piston for moving said spring to increase the
amount but before the time at which ?uid under
force acting to close said exhaust valve during
pressure is admitted to said cylinder for a quick
opening of the breaker.
automatic reclosing operation, thereby prevent
13. Operating mechanism for a circuit breaker
comprising an operating cylinder, a piston in said 25 ing dumping of the reclosing ?uid pressure in
said cylinder during the ?rst portion of a quick
cylinder operatively related to the breaker, a
reclosing operation and allowing a time interval
source of ?uid under pressure for actuating said
for mechanical closing of said exhaust valve.
piston, means including an inlet valve operable
15. In combination, a circuit breaker biased
to connect one end of said cylinder to said source
to
open circuit position, operating mechanism
of ?uid under pressure to effect closing of the 30
therefor comprising an operating cylinder, 2.
breaker, means operable to cause opening of the
piston in said cylinder operatively related to the
breaker, an electromagnet having an armature
breaker,
a source of compressed air for operating
operable upon the occurrence of predetermined
said piston to close the breaker, means including
overload conditions in the circuit to cause oper
an inlet valve operable to connect said source
ation of said means to open the breaker, means 35
of compressed air to said cylinder to close the
automatically operable to open said inlet valve
breaker, latching means for releasably holding
to initiate quick automatic reclosing operation
of the breaker after interruption of the circuit
but before the breaker reaches full open position,
said breaker closed, electromagnetic tripping
means operable in response to predetermined ab
a fluid pressure exhaust passage communicating 40 normal conditions in the circuit to cause said
latching means to release the breaker to there
with said cylinder at a point intermediate the
by cause opening of the breaker, exhaust means
end positions of said piston, said passage being
associated with said cylinder including a piston
of a size su?icient when said passage is open
type
exhaust valve biased closed and operable
to cause quick collapse of fluid pressure in said
by air pressure to cause a quick collapse of pres
cylinder on the closing side of the piston even
sure in said operating cylinder even if said inlet
if said inlet valve is open, a piston type exhaust
valve is open, means including a normally closed
valve in said passage, spring means biasing said
pilot valve operable to cause opening of said
exhaust valve closed to normally close said ex
exhaust valve, and means for causing opening
haust passage, means operated simultaneously
of said pilot valve substantially simultaneously
with the operation of said armature to cause said
with the operation of said electromagnetic trip
exhaust valve to be opened by ?uid pressure in
a portion of said cylinder, said breaker oper
ating piston closing off communication between
said exhaust passage and a portion of the oper
ping means.
ating cylinder after said breaker has opened a Y
predetermined amount but before the time at
which ?uid under pressure is admitted to said
cylinder for a quick automatic reclosing oper
ation, thereby preventing dumping of the reclcs
ing ?uid pressure in said cylinder during the
?rst portion of a quick reclosing operation and
allowing a time interval for mechanical closing
of said exhaust valve.
14. In combination, a circuit breaker biased
p.
i
16. In combination, a circuit breaker, operating
mechanism therefor comprising an operating
cylinder, a piston in said cylinder operatively
related to the breaker, a source of compressed air
for operating said piston, means including an
inlet valve operable to connect said source of
compressed air to said cylinder to close the
breaker, latching means for holding said breaker
in closed position, tripping means operable in
response to predetermined abnormal conditions
in the circuit to cause said latching means to
release the breaker, a, compressed air operated
to open circuit position, operating mechanism 65 dump valve directly connected to said cylinder
apart from the connection to said pressure source
therefor, comprising an operating cylinder, a
for instantaneously reducing back pressure
piston in said cylinder operatively related to the
against said piston so that high speed opening
breaker, a source of ?uid under pressure for
operation of said breaker may be obtainedeand
actuating said piston to close the breaker, means
including an inlet valve operable to connect one 70 means for causing opening of said dump valve
in response to operation of said tripping means
end of said cylinder to said source of ?uid under
by pressure air from the cylinder if, and only
pressure to effect closing of the breaker, latching
if,
there is pressure air in the cylinder.
means for holding said breaker closed, tripping
17. A pneumatic operating mechanism of the
means operable upon the occurrence of prede
termined overload conditions in the circuit to 75 trip-free type for an electric circuit breaker com
21
2,408,199
prising a source of compressed gas, a ?uid motor
including a piston and cylinder, an inlet to said
cylinder from said source, a control valve be
tween said source and inlet, said valve being ar
ranged to admit gas under pressure from said
source to said cylinder, means operatively re
lating said piston to said circuit breaker for
closing said breaker, a dump valve connected to
said cylinder intermediate its ends for venting
rapidly said cylinder to atmosphere at the work_ 10
ing face of said piston only when said piston is
22
on the side of said dump valve connection op
posite said inlet whereby said piston can then
return toward its initial position notwithstand
ing ?ow of ?uid under pressure from said source
through said control valve and inlet to said
cylinder, and means for causing opening move
ment of said breaker and for also opening said
dump valve for causing trip-free operation.
JAMES M. CUMMING.
RICHARD C. CUNNINGHAM.
ker operating mechanism oper
manufacture.
ated by ?uid pressure to close or to automatically ~
itself, however, both as to structure and oper
The novel features that are considered char
acteristic of the invention are set forth in par
ticular in the appended claims. The invention
2,408,199
3
vantages thereof will be best understood from
the following detailed description of several em
bodiments thereof when read in conjunction with
the accompanying drawings, in which:
means of a high speed latching mechanism com
prising a main latch 5| which is pivoted on the
main casting 21 by means of a pivot pin 53. The
latch 5| is adapted to extend between the parallel
levers 31 and its latch end is adapted to engage
and restrain the roller 41 carried by the free end
of the breaker operating lever 35. The latch 5|
is biased to latching position against a stop 55
by means of a spring pressed plunger 51 which
engages a projection 59 of the latch. The plunger
Figure 1 is a vertical sectional view of a cir
cuit breaker operating mechanism embodying the
features of the invention, the mechanism being
shown in the closed position by the full lines;
Fig. 2 is a fragmentary sectional view, taken
substantially along the line IlI--II of Fig. 1, showing the exhaust valve of the mechanism, which
cannot be seen in the section of Fig. 1;
Fig. 3 is a wiring diagram of the circuits for
controlling opening and closing of the circuit
breaker, the operating mechanism and circuit
breaker being illustrated schematically in this
?gure; and
Fig. 4 is a fragmentary sectional View similar
to Fig. 2 but illustrating a modi?ed construction
4
35 is adapted to be held in the closed position,
shown in Fig. 1, to hold the breaker closed, by
ation together with additional objects and ad
51 is slidably mounted in an opening in a portion
of the main casting 21 and is biased inwardly
against the projection 59 of the latch 5| by means
of a compression spring 5| surrounding the
plunger 51 and disposed between the head thereof
and a plate 63 secured to the casting 21. An
adjustable nut 65 is threaded on the outer end
20 of the spring pressed plunger 51 and this nut
of the exhaust valve.
Referring to the drawings, the circuit breaker
1 shown schematically in Fig. 3, may be of any
conventional construction either of the oil break,
air break or gas blast type. The circuit breaker,
as shown, comprises stationary contact means 9
and cooperating movable contact means H for
controlling a main circuit represented diagram~
serves to limit inward movement or the plunger.
The construction of the latch face of the main
latch 5| is such that this latch alone will not serve
by itself to hold the breaker operating lever 35
in closed position unless the main latch is itself
? held in latching position.
An auxiliary latch 61
is provided for normally engaging and holding
the main latch 5| in latching position. The
auxiliary latch 61 is pivoted on the casting 21 by
matically by a single line |3. Although illustrated
means of a pivot pin 69 and has a latch projection
as a single pole circuit breaker, it will, of course, 30
1| which is adapted to engage under a tail pro
be understood that the breaker may be a multi
jection 13 of the main latch 5| in the latching
pole circuit breaker having a set of contact means
position of the latching means. The auxiliary
9?| | for each pole thereof with the movable con
latch 61 is biased to latching position, as shown
tact means mechanically connected for simulta
in Fig. 1, by a compression spring 15 which is
neous operation in the usual manner. The circuit 35
seated in a recess in the casting 21 and engages
breaker is biased to open circuit position by means
an integral projection of the auxiliary latch. The
of an accelerating spring shown schematically at
auxiliary latch 61 is also provided with a projec
l5, and the breaker is mechanically connected
tion 11 which extends directly over the upper end
to the operating mechanism indicated generally
of the trip plunger 19 of an electromagnetic trip
40
at l1 by suitable connecting means. The con
device 8|. The trip device 8| comprises in addi
necting means is represented schematically as
tion to the trip plunger 19, an E-shaped core 83
comprising a lever | 9 pivoted at 2| on a ?xed
of magnetic material, an energizing winding 85
support, one end of the lever being pivotally con
which
is mounted on the center leg of the E.
nected to the breaker lift rod 23 and the other
shaped core, and a movable armature E1 cooper
end being pivotally connected to the breaker
ating with the core 83. The trip plunger 19 is
operating rod 25 which is, in turn, mechanically
secured
to the center portion of the armature 81
connected to the operating mechanism l1.
and slidably extends upwardly through a guide
Referring now to Fig. 1, the operating mecha
opening in the center portion of the core 83 and
nism comprises a main casting 21 which is formed
through an opening in the horizontal portion of
50
to provide a cylinder 29 closed at the upper end
the main casting 21. The armature 81 is biased
by an integral part of the casting. A closure
downwardly to unattracted position, as shown in
member 3| is secured to the lower end of the
Fig. 1, by a compression spring 89 which encircles
cylinder 29 to close this end of the cylinder, and
the upper portion of the plunger 19 and is dis
this closure member has a relatively large port
33 therein which is open to the atmosphere. An 55 posed between a collar 9| secured to the plunger
and a bushing 93 which is threaded in the upper
operating or latching lever 35 is pivotally mounted
end of the opening of the casting through which
at one end on the casting 21. The operating lever
the
plunger extends. When the trip device 8|
consists of two spaced parallel levers 31 (only one
is energized, the armature 81 thereof is moved
being visible in Fig. l) which are pivotally con
upwardly against the core 83 causing upward
nected at one end by means of a pivot pin 39 to 60
movement of the trip plunger 19. This upward
the upper end of a pair of parallel links 4| (only
movement of the trip plunger causes the auxiliary
one appearing in Fig. 1) which are in turn piv
latch 1| to be rotated counterclockwise and dis
otally mounted on an car 43 of the main casting
engage the projection 13 of the main latch 5|,
21 by means of a pivot pin 44. The opposite end
whereupon the accelerating spring l5 of the cir
of the levers 31 comprising the operating lever
35 are connected by a cross member and carry a
short shaft 45 therebetween, on which is rotatably
mounted a roller 41 disposed between the parallel
levers 31. The breaker operating rod 25 is piv
otally connected by a pivot pin 49 to an inter
mediate point of the operating lever 35, the pivot
pin 49 extending transversely through the par
allel levers 31 and engaging an opening in the
lower end of the rod 25 which is disposed between
the parallel levers. The breaker operating lever 75
cuit breaker moves the breaker to open circuit
position, the operating lever 35 being rotated
counterclockwise about its pivoted end by the
opening movement of the breaker. During the
initial opening movement of the operating lever
35, the roller 41 forces the main latch 5| in a
counterclockwise direction as it clears the latch.
In order to prevent the auxiliary latch from being
returned to latching position until the breaker
operating lever 35 is returned to closed position
5
2,408,199
there is provided a U-shaped holding lever 95 the
legs of which are pivotally mounted on the ends
of the pivot pin 69 on opposite sides of the aux
iliary latch til. The holding lever 95 is biased
in a counterclockwise direction by the compres
sion spring 91 which is seated in a recess in the
casting 21 and engages a projection $9 of the
holding lever. A cross member ml of the holding
rounds the guide sleeve I 3|. The lower end of
the valve biasing spring I35 bears against the
spider legs of the bushing I33 and the upper end
of the spring bears against a, spring support I3?!
which is secured to the upper end of the valve
stem I29. The auxiliary air tank III is secured
to the underside of the valve housing II9 by
means of a plurality of bolts I39 (only one being
lever 95 is disposed directly beneath the end of
shown) which extend through the valve housing
the operating lever 35 so as to be held in inopera 10 i it and engage an annular ?ange MI formed on
tive position when the operating lever 35 is in
the. neck of the air tank III, thereby clamping
closed position. However, when the operating
the ?ange tightly against the underside of the
lever is released and moves toward open position,
valve housing H9. A sealing ring 543 is inter?
the holding lever 95 is rotated in a counterclock
posed between the valve housing and the ?ange
wise direction and a lateral extension I09: of the 15 MI of the auxiliary air tank iII to tightly seal
portion 99 of the holding lever engages and holds
the joint there-between. The auxiliary air tank
the auxiliary latch 61 in unlatched position until
i H is connected to a main air storage tank (not
the breaker operating lever 35 is returned to
shown) by moans of a conduit M5, compressed
closed position and its roller has become re
air being supplied to and maintained in the main
engaged by the latch face of the main latch 5i. 20 storage tank by a suitable motor driven com
For this purpose the biasing spring 91 of the hold
pressor unit, not shown.
ing lever is of greater strength than the auxiliary
The main inlet valve I21 is adapted to be
latch biasing spring ?I5.
opened by means of a valve piston I4?! to admit
An operating piston ")3 having piston rings N35
compressed air into the upper end of the oper
is movable within the operating cylinder 29 and ~
ating cylinder 2%} to? close or automatically reclose
this piston has a piston rod Ill?! which slidably
the circuit breaker. The valve piston I4?! is mov
extends in a ?uid tight manner through an open
ing provided therefor in the top wall of the cylin
der 29. The upper end of the piston rod Iiil has
able in a valve cylinder M9 formed in the valve
housing H9, and the valve piston is biased up
wardly to an. inoperative position against the
a connecting element H39 threadedly connected 30 head of the valve cylinder by means of a helical
thereto, which is pivotally connected to the? pivot
compression spring I5I which surrounds a por
pin 49 carried by the operating or latching lever
tion of a valve biasing spring and is disposed
35. Thus the operating piston I93 is mechanically
between the underside of the valve piston and a
connected directly to the circuit breaker oper
shoulder formed in the valve housing I IS.
ating rod 25. The purpose of the lever 35 is to
The valve operating piston M1 is adapted to
provide a mechanical advantage for the latching
be moved downwardly to open the main inlet
means to reduce the latch load, otherwise the
valve, by compressed air from the auxiliary air
lever 35 could be omitted and the latch arranged
tank Ill, through passages I52 and E53 formed
to latch directly on the operating rod. The oper
in the valve housing II 9, the valve piston Ill?!
ating piston IE3 is adapted to be moved down 40 being suitably recessed at its upper end, as shown
wardly in the cylinder 29 to close or automatically
in Fig. 1, for the purpose of permitting the com
reclose the circuit breaker, by compressed air
pressed air to move the piston downwardly from
from an auxiliary air reservoir or tank HI, the
its upper inoperative. position. The air passages
compressed air being admitted to the upper end
and I53 communicate with cooperating pas
of the operating cylinder 29 through an inlet : sages in the pilot valve housing I55 which is
passage controlled by a main inlet valve indicated
secured to the main valve housing H9. Com
generally at I � The opening operation of the
munication between. the auxiliary air tank and
main inlet valve is, in turn, controlled by a pilot
the upper end of the valve cylinder I 45 is nor
valve H5 operated by an electromagnet ill.
mally shut o?, however, by a pilot valve I51 dis
A skirt on the lower end of the operating piston
I03 cooperates with an annular recess I 84 formed
by the closure plate 3: to provide a dash pot
action to help in, stopping the piston at the end
of its downward or closing stroke.
The main inlet valve [l3 comprises av valve
housing I59 which is secured to the side of the
main cylinder casting 27 by a plurality of bolts
(not shown), and this valve housing is provided
with inlet passages I2 l and
the former com
municating with the auxiliary air reservoir Hi
and the latter communicating with an inlet port
I25 in the upper end of the main cylinder 25.
A main valve element 52?! disposed in the valve
guide
housing
sleeve
has '53.!
a stem
which
I25isslidably
carried mounted
by a bushing
in
I33. The bushing I33 is threaded in an opening
in the valve housing between the passages 12!
and 823, and this bushing serves as a valve seat
fer the valve element M27. The guide sleeve I35
is connected to the bushing :33 by a plurality of.
spider legs which permit the compressed air to
?ow through the passages iZI and
when the
valve is open. The valve element 522:? is biased
- posed in the pilot valve housing 555.
The pilot
valve I5?! is biased to closed position against its
seat by a compression spring I59 which bears
against the underside of the pilot valve. The
pilot valve is adapted to be operated to open posi
tion to cause air pressure to open the main inlet
valve, by means of the electromagnet I I?! upon
energization thereof.
The cylinder portion I49 of the main inlet
valve housing is provided with a plurality of ports
lid (only one being shown) adjacent the lower
end of the cylinder 549 which open to the atmos
phere. These ports function to prevent the main
inlet valve from being reclosed by the differential
pressure on the under side of the valve piston
I41 aided by they force of they springs I35 and I5!,
as the main inlet valve 22.?! opens.
A skirt on
the lower end of the valve piston M?! closes the
ports I555 as the piston I4?! reaches the bottom end
of its stroke to prevent any further leakage of
the closing air pressure through ports �. The
ports E50 also function to slowly exhaust the air
pressure in the operating cylinder 23 after the
completion of a normal closing operation.
to closed position, as shown in Fig. 1, by means
The electromagnet II?! comprises a frame, I6!
of a helical compression spring I 351- which sur 75
and a core I53 both of magnetic material, an
2,408,199
8
energizing winding I65, and a pivoted armature
I51. The electromagnet is secured to the pilot
valve housing I55 by the lower end of the core
I63 being threaded into an opening in the upper
of the operating cylinder 29 by a plurality of
bolts (not shown), and the exhaust passage I83
extends through the valve housing and is open to
the atmosphere at a port I88 on one side of the
end of the pilot valve housing I55, thus clamping
the winding spool and the frame IISI to the pilot
valve housing I85. The exhaust passage I83,
however, is normally closed by a piston type ex
Valve housing I55, the upper end of the core
I63 having a shoulder which bears against a plate
I59 which rests on the upper end of the winding
spool. The armature I51 of the electromagnet is
pivotally supported on the upper end of the frame
IBI, and this armature engages a plunger I1I
which extends slidably through an opening in the
center of the core I33, and the plunger is con
nected at its lower end to the pilot valve I51. 15
haust valve I39 which is slidably mounted in a
cylinder I9I formed in the exhaust valve hous
ing I85. The piston type exhaust valve I89 is
biased upwardly to closed position in which it
The pilot valve biasing spring I59 normally main
tains the pilot valve in closed position and the
closes the exhaust passage I83, by means of a
helical compression spring I93 disposed within
the valve cylinder. The upper end of the biasing
spring I93 bears against the underside of the top
of the piston valve I89 and the lower end of the
spring bears against the bottom closure plate
I55 01? the valve cylinder I9I, An annular guide
projection I91 is formed integral with the bottom
armature I61 in unattracted position. A casing
end plate I95 of the valve cylinder I9I and a co
I13 is secured to the plate I59 and frame I6I,
20 operating cylindrical shaped projection I99 is
and this casing encloses the armature I61.
formed on the inside of the piston I89. The pro
When the electromagnet H1 is energized, the
jections I91 and 199 serve as a guide for the bias
armature I61 thereof is moved to attracted posi
ing spring I93, and when the exhaust valve is
tion depressing the plunger Ill and thereby caus
moved downwardly to open position, the cylin
ing opening of the pilot valve I51 to admit com
drical projection I99 slides into the annular pro
pressed air from the air tank II I to the upper
jection I31 to provide a cushioning effect by the
end of the valve cylinder I49. The compressed
trapped air in the bottom of the annular projec
air ?owing into the upper end of the valve cylin
tion I31 at the end of the opening movement of
der through the passages I52 and I53 forces the
the exhaust valve I89. The exhaust ports I8I and
valve piston I41 downwardly, thereby causing
opening of the main inlet valve I21 to admit com 30 exhaust passage I83 are of a size sufficient when
the exhaust valve is open to cause quick col
pressed air to the upper end of the breaker oper
lapse of air pressure in the main operating cyl
ating cylinder 29. When the main inlet valve
inder 29 even though the main inlet valve I21
I21 is open, compressed air flows from the auxil
may be open. The exhaust passage and exhaust
iary air tank III, through the passages I2I and
I23 into the main operating cylinder 29 and 35 valve operate to quickly dump the air pressure
in the main operating cylinder 29 whenever the
quickly moves the operating piston I93 downward
trip device BI is operated, thus preventing any air
ly to closed position, thereby closing the circuit
pressure on the closing side of the main operating
breaker 1. As soon as the electromagnet II1 is
piston Hi3 from retarding opening movement of
deenergized, the pilot valve I 51 immediately closes
the circuit breaker when the circuit breaker is
and the main inlet valve I21 is quickly returned
called upon to open. Opening of the main ex
by its biasing spring I35 to closed position, the
haust valve IE9 is controlled by a pilot valve, in
valve operating piston I41 being also returned
dicated generally at ZBI, which is adapted to be
upwardly to its upper inoperative position by the
operated by the trip device 8I, Actual opening
spring I5I.
A push button I15 extends through the casing
I13 of the electromagnet and engages the arma
ture I61.
The push button I15 serves as a means
' movement of the main exhaust valve I89 is pro
duced by air pressure from the main operating
cylinder 29, when the pilot valve is opened by
the operation of the trip device 8|.
The exhaust pilot valve comprises a light pilot
for manually opening the pilot valve I51 to cause
a closing operation of the circuit breaker. The
electromagnet I I1 of the pilot valve I I5 is adapted 50 valve element 293 movable in an opening 294
provided therefor in the pilot valve housing 205
to be operated electrically to cause closing or
which is formed integral with the main operating
automatic reclosing of the circuit breaker by cir
cylinder casting 21. If desired the pilot valve
cuit means which will be hereinafter described.
housing 295 may be made as a separate casting
In order to provide for quick reversal of move�
secured to the cylinder 29. The pilot valve ele
ment of the operating piston I93 and circuit
ment 293 is directly mechanically connected to
breaker 1 (Fig. 3) to provide the effect of trip
the lower end of the trip plunger 19 which is con
free operation of the circuit breaker and to also
nected to and extends through the armature B1
provide for quick reclosing of the breaker, the
of the trip device. An air passage 291 formed in
operating cylinder 29 is provided with an air pres
the
cylinder casting 21 communicates with the
sure exhaust means for causing quick collapse of 60
main operating cylinder at one end and at the
air pressure in the cylinder 29 whenever the trip
other end with the valve opening 204, in which
ping device BI is operated, the exhaust passage
the pilot valve element 293 slides, The valve
of the exhaust means being so located that it is
opening 294 is in communication with a passage.
closed by the main operating piston before the
2II (Fig. 2) formed in a closure plate 2I2 which
piston reaches a position at which compressed
is secured to the bottom of the pilot valve hous
air is admitted for quick reclosure. The pres
ing 295. A conduit 2I3 (Fig, 2) connects the air
sure exhaust means comprises exhaust ports I8I
passage 2II to a recess 2I5 in the upper end of
formed in the side wall of the operating cylinder,
the exhaust valve cylinder I9l above the piston
indicated by the dotted lines of Fig. 1.
type main exhaust valve I89. The top of the
70
Referring to Fig. 2, the exhaust ports I8I in
main exhaust valve I89 is recessed, as shown in
the side of the main operating cylinder 29 com
Fig. 2, to permit the air pressure admitted
municate withv an exhaust passage I83 formed in
through the conduit 2I3 when the pilot valve is
the valve housing I35 of a main exhaust valve
opened, to initiate opening movement of the main
indicated generally at I81 (Fig. 2), The main
exhaust valve housing I85 is secured to the side 75 exhaust valve I89. As soon as the main exhaust
9
2,408,199
valve I89 is opened a small distance by air pres
sure through the conduit 2I3, the air pressure
?owing from the main operating cylinder 29,
through the exhaust passage I83 passes over the
top of the main exhaust valve I89 and the pres
10
which connects the circuit breaker operating rod
25 to the operating lever 55. The operating shaft
233 of the auxiliary switch device
is also con
nected by a crank 245 and a link 25? to the pro?
jection 239 of the auxiliary switch operating lever
sure quickly forces the main exhaust valve down
21?. Thus each of the auxiliary switch devices
wardly to open position and maintains it in open
225 and 22? is operated by and in accordance with
position against the force of the main exhaust
the movement of the circuit breaker '5'.
valve spring I93 until the pressure in the main
Referring now to Fig? 3 which diagrammati
operating cylinder 29 has collapsed to a prede 10
cally shows the circuits for electrically control
termined value whereupon the spring I93 imme
ling the inlet valve electromagnet II? and the
diately recloses the main exhaust valve. The air
trip device 8!. 25I and 253 designate a pair of
trapped in the annular projection I9'I by the
supply conductors connected to a source of elec
piston type projection I99 assists the spring I93
tric energy (not shown). The winding I65 of
in quickly returning the main exhaust valve to
closed position upon collapse of pressure in the
breaker operating cylinder. The biasing spring
the electromagnet Ill which controls the admis
sion of compressed air to the operating cylinder
for closing the circuit breaker, is connected in
an energizing circuit 255 extending from the sup
39 of the trip plunger 19 serves to return the ex
haust pilot valve 293 to closed position as soon
ply conductor 25I, through the Winding I55,
as the trip device BI is deenergized.
20 through back contacts 251 of a release relay 259
A port H9 is provided in the lower end of the
and front contacts 26! of an operating relay 293
exhaust valve cylinder I9I to permit opening of
the piston type main exhaust valve I89, the port
to the supply conductor 253.
The energizing
winding of the operating relay 263 is connected
2I9 being opened to the atmosphere to allow air
in an energizing circuit which extends from the
beneath the piston I99 to escape upon downward
supply conductor 253, through a conductor 295,
movement of the piston of the valve One or
back contacts 26'! of the release relay 259, ener
more small bleeder openings 22I are provided in
gizing winding of the operating relay 259, con
the top of the piston type main exhaust valve I89
ductor 259 and through a manual control switch
to prevent leakage air from the pilot valve 29I
2'? for controlling normal closing operation of
and from the main cylinder 29 from falsely oper 30 the circuit breaker, to the supply conductor 25L
ating the exhaust valve I89.
The energizing winding of the release relay 259
The exhaust ports I8! are located in the side
is connected in an energizing circuit which ex
wall of the cylinder 29 at a point intermediate
tends from the supply conductor 253, through an
the end positions of the operating piston H33 so
auxiliary switch 213 which is adapted to be closed
that these exhaust ports will be closed by the
when the circuit breaker reaches closed posi
main operating piston I03 after the ?breaker has
tion, through a conductor 215, energizing wind
opened a predetermined distance su?icient to in
ing of the release relay 259, conductor 21?.
terrupt the circuit and before the main operat
through the front contacts 2'58 of the operating
ing piston reaches the position at which com
relay 253 and through a conductor 219 to the
pressed air is admitted for quick automatic re
supply conductor 25I.
closing of the breaker. This arrangement pre
A stick circuit is provided for maintaining the
vents the dumping of the quick reclosing air pres
operating relay 253 energized after a momentary
sure and also allows a time interval for the me
operation of the manual closing control switch
chanical closing of the main exhaust valve �
2?. This stick circuit extends from the supply
on a quick reclosing operation of the mechanism.
conductor 253, through the conductor 255 and
The closing of the exhaust ports I8I by the pis
back contacts 267 of the release relay 259, ener
ton I93 also acts to provide a cushioning action
giZing winding of the operating relay 253, and
for the partial opening stroke of the breaker and
through a conductor 283, conductor 27?, front
piston during a quick reclosing operation. It
contacts 218 of the operating relay and conduc
will thus be seen that the pressure exhaust means .
tor 279 to the supply conductor 25!. A locking
in addition to providing trip free action to per
circuit is also provided for maintaining the re
mit quick reversal of switching movement during
lease relay 259 energized until the manual clos
closing or reclosing and substantially unretarded
ing control switch 2'? has been opened. This
opening movement of the breaker, also provides
locking circuit for the relay 259 extends from
for quick reversal of the opening movement dur
the supply conductor 253, through a portion of
ing a quick reclosing operation by preventing the
the conductor 265, front contacts 285 of the re
dumping of the reclosing air during the initial
portion of the reclosing operation, before the ex
lease relay 259, energizing winding of release re
lay 259, conductor 283, conductor 299 and the
manual closing control switch 2'? to the supply
A pair of auxiliary switch devices 225 and 22'! 60 conductor 25 I.
is mounted on a bracket 229 secured to the main
The winding 85 of the trip device BI is con
casting 27. Each of these auxiliary switch de
nected in an energizing circuit which extends
vices comprises a multi-pole auxiliary switch of
from the supply conductor 253, through conduc
conventional construction, wherein the individ
tor 287, through an auxiliary switch 299 which is
haust valve I91 closes.
ual switch poles are adjustable relative to their
operating shafts 23I and 233, respectively, where?
closed when the circuit breaker is closed, con
ductor 29I, energizing winding 95 of the trip
by the auxiliary switches may be set to operate
device
8i, conductor 293 and the contacts 295
at predetermined desired points in the operation
of a fault responsive relay 29? and through a
of the main circuit breaker ?I. The operating
conductor 299 to the opposite supply conductor
shaft 23! of the auxiliary switch device 225 is 70 25L The fault responsive relay 291 is arranged
connected by a crank 235 and link 231 to the pro
to be operated to close its contacts 295 upon the
jection 239 of an auxiliary switch operating lever
occurrence of a predetermined overload, such,
MI. The lever 24I is pivotally mounted on the
for example, as a short circuit in the main cir
?xed pivot pin 53 and the free end of this lever
cuit
I3 controlled by the circuit breaker ?I. For
is connected by a slot 249 to the pivot pin 49 75 this purpose,
the energizing winding of the pro
2,408,199
11
tective relay 291 is arranged to be energized by
a current transformer 39! associated with the
main circuit conductor !3. Thus when a prede
termined overload condition or short circuit oc~
ours in the main circuit !3 controlled by the
12
closing the adjustable" auxiliary switch 3l1. The
contacts 3!9 of the fault responsive relay are
closed simultaneously with the contacts 295 upon
operation of the fault responsive relay in re
sponse to an overload or short circuit, thus im
breaker ?I, the fault responsive relay 291 becomes
energized a suflicient amount to close its contacts,
thereby effecting energization of the trip de
vice 8!. When the trip device 8! is energized, it
mediately preparing the energizing circuit for
the reclosing relay 391. During the initial open
circuit breaker operating lever 35, whereupon the
circuit breaker is quickly moved to open position
by its biasing springs.
relay 391 thereupon closes its contacts 399, com
pleting an energizing circuit for the operating
relay 263, this energizing circuit extending from
the supply conductor 25!, through the contacts
399 of the reclosing relay, conductor 3!!, con
ductor 269, energizing winding of operating re
lay 263, back contacts 261 of the release relay
259, and conductor 265 to the opposite supply
ing movement of the circuit breaker, the aux--v
iliary switch 3!1 closes and completes the ener
causes release of the latching means 5!, 1! and 10 gizing circuit for the reclosing relay 391', and the
The circuit breaker 1 may also be tripped open
manually by means of a manually operable trip
control switch 303 connected in series with a
conductor 395 which is arranged to shunt the
contacts 295 of the protective relay 291.
conductor 253. The operating relay instantly
The circuit breaker 1 is adapted to be auto
matically reclosed immediately following inter 20 closes its contacts 218 and 23!. Closing of the
operating relay contacts 26! completes an ener~
ruption of the circuit by the circuit breaker 1,
gizing circuit for the inlet valve controlling elec
through the agency of a reclosing relay 391.
tromagnet l!1, through the back contacts 251
Automatic reclosing movement of the circuit
of the release relay, and through conductor 255.
breaker is preferably initiated immediately after
the circuit breaker has interrupted the circuit 25 The electromagnet I !1 when energized opens the
pilot valve _!51, thereby causing opening of the
and before the circuit breaker reaches full open
main inlet valve !21. Compressed air is there
position. Reclosing relay 391 has its contacts
upon admitted to the upper end of the operating
309 connected in series with a conductor 3!!
cylinder 29 quickly moving the operating piston
which is connected in shunt relation to the con
tacts 0f the manual closing control switch 21!. 30 ma downwardly to close the circuit breaker.
These operations occur substantially instan
taneously so that reclosing movement of the
operating piston is initiated immediately after
the circuit has been interrupted and before the
The energizing winding of the reclosing relay 35 breaker reaches the full open position. The po
sition at which automatic reclosing movement of
301 is connected in series in an energizing circuit
the main operating piston I93 takes place is in
3!5 which extends from the supply conductor
dicated by the dotted lines R in Fig. 1. As has
253, through the winding of the reclosing relay
previously been explained, the exhaust ports !8!
301, through an adjustable auxiliary switch 3l1
are located in a position such that they are
which is adjusted to close during the initial open
closed by the operating piston I03 during the
ing movement of the circuit breaker, and through
?rst part of the opening movement of the breaker
contacts 3!9 of the protective relay 291 and con
before the piston reaches the position at which
ductor 299 to the opposite supply conductor 25!.
compressed air is admitted for quick reclosure,
The operation of the mechanism is as follows,
so that dumping of the reclosing air is thereby
assuming the circuit breaker to be in closed po
prevented and the exhaust valve [89 is given a
sition, as shown in Figs. 1 and 3. When a pre
time interval to mechanically close before the
determined overload or short circuit occurs in
downward movement of the operating piston
the main circuit !3 controlled by the circuit
opens the exhaust ports !8!.
breaker 1, the fault responsive relay 291 is im
Closing of the contacts 218 of the operating
mediately energized and closes its contacts 295
relay 263 prepares an energizing circuit for the
to e?ect energization of the trip device 8 I. When
release relay 259. This circuit extending from
the trip device 8! is thus energized, it moves the
the supply conductor 25!, through conductor 219,
trip plunger 19 upwardly to cause the auxiliary
contacts 218, conductor 211, energizing winding
latch 61 to release the main latch 5!, thereby
releasing the breaker operating lever 35. The - of the release relay 259, conductor 215 to the aux
iliary switch 213 which closes the instant the cir
circuit breaker is immediately moved to open po
cuit breaker reaches closed position. As soon
sition by its biasing spring !5. The operation
as the circuit breaker reaches closed position, the
of the trip plunger 19 also opens the pilot valve
auxiliary switch 213 completes the energizing
293, thereby causing the main exhaust valve to
circuit for the release relay 259, whereupon the
be opened and quickly exhaust any air pressure
release relay operates to open its back contacts
in the operating cylinder 29, if there is any pres
A manually operable switch 3i3 is provided in
the conductor 3!! for the purpose of preventing
quick automatic reclosing operation of the cir~
cuit breaker if automatic reclosing is not desired.
sure in the cylinder 29 at this time.
The main
circuit I3 is interrupted during the ?rst part of
the opening movement of the circuit breaker 1
by the time the circuit breaker has opened
through only a part of its full open distance.
Assuming the manual switch 3l3 to be closed,
quick automatic reclosing operation of the circuit
261 and 251 and closes its front contacts 285.
The opening of contacts 251 effects deenergiza~
tion of the inlet valve controlling electromagnet
!!1, thereby causing shutting off the supply of
compressed air to the operating cylinder 29, and
the opening of contacts 231 e?ects deenergization
of the operating relay 263. The closing of the
front contacts 285 normally produces no effect
breaker will be caused to take place as soon as
the circuit breaker has opened through a prede 70 during quick automatic reclosing operation, since
the contacts 399 of the reclosing relay open be
termined distance, less than the full open dis
fore the breaker reaches closed position.
tance, Quick automatic reclosing operation of
If the condition which caused the overload or
the circuit is accomplished by the reclosing relay
short circuit has been removed by the time the
301 in response to closing of its circuit by the
contacts 3l9 of the fault responsive relay 291 and 75 circuit breaker completes the circuit upon a quick
13
2,408,199
14
automatic reclosing operation, the circuit breaker
tacts 285 and energizing winding of the release
relay 259, conductor 283, conductor 269 and man
ual closing control switch 21! to the supply con
ductor 25 I. This locking circuit thus prevents the
circuit breaker from pumping if the breaker will
remains closed and the control circuits assume
the normal condition shown in Fig. 3. However,
if the fault condition which causes the overload
or short circuit is still present at the time the
circuit is completed by the contacts of the circuit
not remain closed and the manual control switch
breaker during a quick reclosing operation there
is held in closed position. If the circuit breaker
of, the fault responsive relay 23?! is again ener
should be closed against an overload or short cir
gized the instant the main circuit is completed
cuit during a normal closing operation, the trip
again causing energization of the trip device 8!. 10 device 8! will be operated to release the latch
Consequently trip plunger 19 is again operated.
and cause opening of the exhaust valve !81 so
upwardly opening the pilot valve 203, thereby
that the breaker will immediately open even
causing the air pressure in the operating cylinder
though the inlet valve I89 may be opened at the
29 to open the main exhaust valve I89 and quickly
time the circuit is completed.
cause collapse of the air pressure in the operat 15
The circuit breaker may be manually tripped
ing cylinder 29 even though the main inlet valve
open by closing the manual trip control switch
!2'! may still be open at this time. The trip de
303 which effects energization of the trip device
vice 8| also moves the latches to released posi
8! and tripping of the circuit breaker.
tion. Thus the circuit breaker is caused to
A modi?cation of the main exhaust valve is
quickly reverse its movement and start opening
illustrated in Fig. a. The construction of this
even though the inlet valve may be open at this
modi?ed form of the exhaust valve is substan
time. The opening movement of the circuit
tially the same as that shown in the original em
breaker is substantially unretarded due to the
bodiment, except that the valve cylinder is open
quick collapse of air pressure in the operating
at its lower end and the lower end of the valve
cylinder 29. A lockout device 32! of any con 25 biasing spring is mechanically connected to the
ventional construction may be provided in the
auxiliary switch operating lever 24%. Referring
circuit of the reclosing relay 3!]? to prevent more
to Fig. 4, the modi?ed exhaust valve comprises a
than one quick automatic reclosing operation of
valve housing 325 secured to the side of the main
the circuit breaker, or to open the quick reclosing
operating cylinder 29. The valve housing is
circuit and transfer control of the reclosing relay
formed to provide a valve cylinder 32? which is
to a time delayed reclosing device in a manner
open at its lower end, and the housing contains
well known in the art. If the lockout device 32!
the exhaust passage 329 which is open to the at
is of a character to provide for only a single
quick automatic reclosure of the circuit breaker,
the circuit breaker proceeds to the full open posi
mosphere at one end and communicates at its
35
tion and remains open after one unsuccessful
other end with the exhaust ports Hit of the op
erating cylinder 29. The exhaust valve 33! is a
piston type valve which is slidably mountedv in
attempt at quick reclosure.
the valve cylinder 32?. The valve 33! is biased
Normal closing operation of the circuit breaker
upwardly to closed position to close the exhaust
from the full open position is accomplished by
passage 329 by means of a helical biasing spring
closing the manual control switch 21!. The clos 40
the upper end of which bears against the
ing of this switch completes an energizing circuit
underside of the piston type exhaust valve. The
for the operating relay 263. When the operating
lower end of the spring 333 bears against a spring
relay is thus energized, it closes its contacts 26!
support 335 which is carried by a connecting rod
and 218, the closing of contacts 26! completing
33?. The connecting rod 331 slidably extends
an energizing circuit for the inlet valve control
' through openings provided in the valve 33! and
ling electromagnet H1, thereby causing com
valve housing 325, and the upper end of the con
necting rod is pivotally connected at 338 to the
pressed air to be admitted to the operating cyl
inder to close the circuit breaker. The contacts
218 prepare an energizing circuit for the release
relay 259, this circuit being completed by the aux
iliary switch 213 when the breaker reaches the
fully closed position. The manual closing con
trol switch 21! need only be closed for an instant
because as soon as the operating relay closes its
contacts 218, a stick circuit is completedv for
maintaining the operating relay energized until
the release relay operates. This stick circuit has
been previously described. Closing of the con
tacts 218 of the operating relay 263 prepares an
auxiliary switch operating lever 26!. The upper
end of the valve cylinder 32'! has a passage 2I5
in
which is connected by conduit 2!?� to the pilot
valve passage 2! l in the same manner as shown
and described in connection with the original
embodiment, and the upper end of the piston type
valve 33! is provided with a recess so that com
pressed air admitted through the conduit 2!3 to
the upper end of the cylinder can initiate open
ing of the exhaust valve 33!. The purpose of
connecting the lower end of the valve biasing
spring to the auxiliary switch operating lever 24!
energizing circuit for the release relay 259 which 60 is to provide for additional compression of the
is completed by the auxiliary switch 213 when
spring as the circuit breaker operating mecha
the breaker reaches the fully closed position.
nism opens in order to insure quick closing of the
When the release relay 259 is energized, it opens
exhaust valve and to prevent the valve from stick
its back contacts 25?! and 261, thereby deenergiz
_ ing open after the air in the breaker operating
ing the inlet valve controlling electromagnet I !'l
cylinder has been exhausted. The remaining
by the contacts 25?! and also deenergizing the
structure of the exhaust valve and its function
operating relay 263 by the contacts 26?! and .pre
is substantially the same as in the case of the
venting further energization of the operating re
original embodiment.
lay as long as these contacts remain open.
The
While the invention has been disclosed in ac
operation of the release relay also closes its front 79 cordance with the provisions of the patent stat
contacts 285 to complete a locking circuit for
utes, it is to be understood that various changes
maintaining the release relay energized as long
in the structural details and arrangements of
as the manual closing control switch 21! is held
parts thereof may be made without departing
closed, this locking circuit extending from the
from some of the essential features of the inven
supply conductor 253, through the front con 75 tion.
2,408,199
15
We claim as our invention:
1. In combination, a circuit breaker biased to
open circuit position, operating mechanism there
for comprising an operating cylinder, a piston in
said cylinder operatively related to the breaker,
a source of compressed air for operating said
piston to close the breaker, means including an
inlet valve operable to connect said source of com
16
ton reciprocable in said cylinder for actuating
the breaker, a source of compressed air for
operating said piston, an inlet valve operable to
connect one end of said cylinder to said source
of compressed air to close the breaker, means
operable to cause opening of the breaker, an
electromagnet having an armature operable in
response to the occurrence of predetermined ab
normal conditions to cause operation of said
pressed air to said cylinder to close the breaker,
latching means for releasably holding said breaker 10 means to open the breaker, an air pressure ex
haust passage communicating with said oper
closed, trippintT means operable in response to
ating cylinder of a size to cause quick collapse
predetermined abnormal conditions in the circuit
of pressure in said operating cylinder on the
to cause said latching means to release the
closing side of said piston even though said inlet
breaker and thereby cause opening of the breaker,
valve is open, a piston type exhaust valve in said
air pressure exhaust means connected to said
passage biased to normally close said passage,
cylinder intermediate its ends so as to be closed
off by said piston when in an intermediate posi
tion, said exhaust means including a normally
closed exhaust valve directly connected to said
cylinder apart from the connection to said source
of compressed. air, said valve when opened caus
ing quick collapse of pressure in said cylinder
except when said piston is at or to one side of
said exhaust valve being operable to open posi
tion to open said passage when air pressure is
applied to one end of the piston of said valve,
the circuit to cause said latching means to re
having an armature operable upon the occur
of the breaker, air pressure exhaust means asso
the circuit to cause said latching means'to release
the breaker and thereby cause opening of the
breaker, a pressure exhaust passage communi
eating with said cylinder of a size to cause quick
collapse of pressure in said cylinder when said
passage is open, a piston type exhaust valve in
said passage normally biased closed to close said
an auxiliary air passage connecting a portion
of said operating cylinder with said one end of
said piston valve, a pilot valve in said auxiliary
passage biased to close said passage, said pilot
valve being connected to the armature of said
said intermediate position, and means operated
by said tripping means upon operation thereof 25 electromagnet to be opened thereby when said
armature is operated to thereby cause opening
for causing opening of said exhaust valve.
of said exhaust valve by air pressure in said
2. In combination, a circuit breaker biased to
cylinder.
open circuit position, operating mechanism there
5. In combination, a circuit breaker biased to
for comprising an operating cylinder, a piston in
said cylinder operatively related to the breaker, 30 open circuit position, operating mechanism
therefor comprising an operating cylinder, a pis
a source of compressed air for operating said
ton in said cylinder connected to the breaker,
piston to close the breaker, means including an
a source of compressed air for operating said
inlet valve operable to connect said source of
piston to close the breaker, means including an
compressed air to said cylinder to close the
breaker, latching means for releasably holding 35 inlet valve operable to connect said source of
compressed air to said cylinder to close the
said breaker closed, a tripping electromagnet
breaker, latching means for releasably holding
having an armature operable upon the occur
said breaker closed, a tripping electromagnet
rence of predetermined abnormal conditions in
lease said breaker and thereby cause opening 40 rence of predetermined abnormal conditions in
ciated with said operating cylinder including an
exhaust valve biased closed and having a piston
Operable by air pressure to open said valve, said
exhaust valve when opened causing quick collapse
of pressure in said breaker operating cylinder,
and means including a normally closed pilot valve
operable by the armature of said tripping electro
magnet upon operation thereof to cause opening
of said exhaust valve.
3. An operating mechanism for a circuit
breaker comprising an operating cylinder, a pis
ton reciprocable in said cylinder for actuating the
breaker, a source of compressed air for operating
said piston, an inlet valve operable to connect .
one end of said cylinder to said source of com
passage, said exhaust valve being operable to
open position when a predetermined air pressure
is applied to one end of the piston of said valve,
an auxiliary air passage connecting a portion
of said cylinder with the exhaust valve housing
adjacent said one end of the valve piston, a pilot
valve in said auxiliary passage biased to nor
mally close said passage, said pilot valve being
connected to the armature of said tripping elec
tromagnet to be opened thereby when said arma
ture is operated to thereby cause opening of
said exhaust valve by air pressure in said
pressed air to close the breaker, means operable
to cause opening of the breaker, an electromagnet
having an armature operable in response to the
occurrence of predetermined abnormal conditions 60 cylinder.
to cause operation of said means to open the
6. In combination, a circuit breaker biased to
breaker, air pressure exhaust means associated
with said operating cylinder including an exhaust
valve biased closed and having a piston operable
by air pressure to open said exhaust valve, said
exhaust means when said exhaust valve is open
causing quick collapse of air pressure in said cyl
inder on the 1closing side of said breaker operating
open circuit position, operating mechanism there
for comprising compressed air operated closing
piston when said breaker-operating piston is in
breaker and thereby cause opening of the breaker,
means automatically operable to initiate an in
or adjacent closed position, and a normally closed
pilot valve operable by the armature of said elec- ,
tromagnet upon operation thereof to cause open
ing of said exhaust valve.
4. An operating mechanism for a circuit
breaker comprising an operating cylinder, at pis 75
means for closing the breaker, latching means
for releasably holding said breaker in closed cir
cuit position, tripping means operable in response
to predetermined abnormal conditions in the cir
cuit to cause said latching means to release the
stantaneous reclosing operation of the closing
means after interruption of the circuit and at
least by the time the breaker reaches full open
position, air pressure exhaust means associated
with said closing means including a normally
17
2,408,199
closed exhaust valve operable to cause a quick
collapse of closing air pressure in said closing
means, said tripping means when operated caus
ing opening of said exhaust valve, and means
responsive to the position of said closing means
for mechanically closing said exhaust ,means
when said closing means is in the neighborhood
of its open position.
18
closed, tripping means operable upon the occur
rence of predetermined overload conditions in the
circuit to cause said latching means to release
the breaker and thereby cause opening of the
breaker, a pressure exhaust passage communi
eating with said cylinder of a size sufficient to
cause quick collapse of pressure in said cylinder
when said passage is open even if said inlet valve
is
an exhaust valve in said passage biased
mechanism 10 to open,
normally close said passage, means operated
7. In combination, a circuit breaker biased to
open circuit position, operating
therefor comprising an operating cylinder, a
piston in said cylinder operatively related to said
substantially simultaneously with said tripping
means for causing opening of said exhaust valve,
said exhaust passage being closed by a part mov
breaker, a source of compressed air, an inlet
valve operable to connect said source of com?
able in accordance with the movement of said
pressed air to one end of said cylinder to effect 15 piston
when said piston is within a predetermined
closing of the breaker, latching means for re
leasably holding said breaker closed, tripping
means operable upon the occurrence of prede
termined overload conditions in the circuit to
distance of the full open position.
10. In combination, a circuit breaker biased to
open
circuit position,
operating mechanism
therefor comprising an operating cylinder, a
cause said latching means to release� the breaker 20 piston movable in said cylinder and operatively
and thereby cause opening of the breaker, means
related to said breaker, a source of compressed
operable to automatically open said inlet valve
air, means including an inlet valve for connect
to cause, said operating piston to initiate reclos
ing one end of said cylinder to said source of
ing of the breaker after interruption of the circuit
compressed air to effect closing of the breaker,
and before said breaker reaches the full open
latching means for releasably holding said
position, an air pressure exhaust passage com
breaker closed, tripping means operable upon
municating with said cylinder at a point inter
the occurrence of predetermined overload condi
mediate its ends, said exhaust passage being of
tions in the circuit to cause said latching means
a size su?icient to cause quick collapse of pres
sure in said cylinder even if said inlet valve is 30 to release the breaker and thereby cause opening
of the breaker, a pressure exhaust passage com
open when the piston is near the end of its
municating with said cylinder through the side
stroke opposite the inlet end of the cylinder and
wall thereof at a point intermediate the ends
said exhaust passage being closed off from the
thereof, said passage being of a size sufficient
inlet when the piston is between said interme
to cause quick collapse of pressure in said cylinder
diate point and the inlet end of the cylinder
when said passage is open, an exhaust valve in
sov as to permit quick reclosing of the breaker
said
passage normally biased closed, means oper
before reaching full open position, an exhaust
ated
by said tripping means upon operation
valve in said passage biased to normally close
thereof for causing opening Of said exhaust valve,
said exhaust passage, and means operated by
said tripping means upon operation thereof to 40 said operating piston closing communication be
tween a portion of said cylinder and said ex
cause opening of said exhaust valve.
haust passage when the breaker is opened more
8. In combination, a circuit breaker biased
than a predetermined distance to permit quick
to open circuit position operating mechanism
reclosing operation of the breaker and allow said
therefor comprising an operating cylinder, a
exhaust valve to close during a quick reclosing
piston movable in said cylinder and operatively
operation.
related to said breaker, a source of compressed
11. An operating mechanism for a circuit
air, means including an inlet valve for connect
breaker comprising an operating cylinder, - a
ing one end of said cylinder to said source of
piston in said cylinder operatively related to the
compressed-air to effect closing of the breaker,
a source of compressed air for actuating
latching means for releasably holding said 50 breaker,
said
piston,
means including an inlet valve oper
breaker closed, tripping means operable upon
able to connect one end of said cylinder to said
the occurrence of predetermined overload condi
source of compressed air to effect closing of the
tions in the circuit to cause said latching means
breaker,
latching means for releasably holding
to release the breaker and thereby cause open
ing of the breaker, a pressure exhaust passage 55 the breaker closed, tripping means operable upon
the occurrence of predetermined overload condi
communicating with said cylinder through the
tions to cause said latching means to release the
side Wall of the cylinder at a predetermined point
breaker and thereby cause opening of the
intermediate the end positions of said piston,
breaker, a pressure exhaust passage communi
said passage having a size such as to cause a
quick collapse of pressure in said cylinder when 60 cating with said cylinder through the side Wall
thereof, said passage being of a size sufficient
said passage is open even if said inlet valve is
when said passage is open to cause quick col
open, an exhaust valve in said passage normally
lapse of pressure in said cylinder even if said
biased closed to close said exhaust passage, and
inlet
valve is open, a piston type exhaust valve
means operated by said tripping means upon
in
said
passage biased to normally close said
operation thereof for causing opening of said 65
passage, means operated substantially simulta
exhaust valve.
neously with said tripping means for causing said
9. In combination, a circuit breaker biased to
exhaust valve to be opened by air pressure in
open circuit position, operating mechanism
said cylinder, said operating piston closing said
therefor comprising an operating cylinder, a
piston movable in said cylinder and operatively 70 exhaust passage off from a portion of the cylinder
when said breaker has opened a predetermined
related to said breaker, a source of compressed
amount less than the full opening distance.
air, means including an inlet valve for connecting
12. An operating mechanism for a circuit
one end of said cylinder to said source of com
breaker comprising an operating cylinder, a
pressed air to effect closing of the breaker, latch
piston in said cylinder operatively related to the
ing means for releasably holding said ?breaker 75 breaker, a source of compressed air for actuating
aroma;
19
20
cause said latching means to release the breaker
said piston to close the breaker, means including
and thereby cause opening of the breaker, means
automatically operable to open said inlet valve
to initiate a quick automatic reclosing operation
of the breaker after interruption of the circuit
but before said breaker reaches full open posi
tion, a ?uid pressure exhaust passage communi
an inlet valve operable to connect one end of
said cylinder to said source of compressed air
to effect closing of the breaker, means operable
to cause opening of the breaker, an electromag
net having an armature operable upon the occur
rence of predetermined overload conditions in the
eating with said cylinder at a point intermediate
the end positions of said piston, said passage
circuit to cause operation of said means to open
the breaker, a pressure exhaust passage com
being of a size suf?cient when said passage is
open to cause quick collapse of fluid pressure
municating with said cylinder, said passage being
of a size sufficient when said passage is open to
cause quick collapse of pressure in said cylinder
?even if said inlet valve is open, a piston type
exhaust valve in said passage, spring means for
in said cylinder even if said inlet valve is ?open,
a piston type exhaust valve in said passage biased
by a spring to normally close said passage,
means operated by said tripping means upon
biasing said exhaust valve to normally close said
passage, means operated by the armature of said
electromagnet upon operation thereof to cause
said exhaust valve to be opened by air pressure
in said cylinder, and a connection between said
operation thereof for causing said exhaustrvalve
to be opened by ?uid pressure in a portion of
said cylinder, said breaker operating piston acting
to close off communication between said exhaust
passage and a portion of the operating cylinder
spring means and a part movable with said 20
after said breaker has opened a predetermined
piston for moving said spring to increase the
amount but before the time at which ?uid under
force acting to close said exhaust valve during
pressure is admitted to said cylinder for a quick
opening of the breaker.
automatic reclosing operation, thereby prevent
13. Operating mechanism for a circuit breaker
comprising an operating cylinder, a piston in said 25 ing dumping of the reclosing ?uid pressure in
said cylinder during the ?rst portion of a quick
cylinder operatively related to the breaker, a
reclosing operation and allowing a time interval
source of ?uid under pressure for actuating said
for mechanical closing of said exhaust valve.
piston, means including an inlet valve operable
15. In combination, a circuit breaker biased
to connect one end of sa
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