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Dec. 17, 1946.
' J, B, MMNEIQLL
1
2,412,897
CIRCUIT INTERRUPTER
Filed Dec. 26, 1942
5
I21, 1‘
25'
Z
2 Sheets-Sheet 1
224.2 ’
Z8
17
50
WITNESSES:
1
, 464%,
mm
INVENTOR _
Jo/m 5 W00 Nez/Z.
~
QJWZYX/K
ATTO
‘
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’
Dec. 17, 1946.
J, B, MécNElLL
2,412,897
C IRCUIT INTERRUPTER
Filed Dec. 26, 1942
2' Sheets-Sheet 2
15
WITNESSES’:
' INVENTOR
_ L644
2a.
W
Jo/WZB Mac/Veil
‘
Patented Dec. 7, 1946
2.,éll2,897
UNITED STATES PATENT OFFICE
2,412,897
CIRCUIT INTERRUPTER
John B. MacNeill, Wilkinsburg, Pa., assignor to
Westinghouse Electric Corporation, East Pitts
burgh, Pa., a corporation of Pennsylvania
Application December 26, 1942, Serial No. 470,161
9 Claims.
This invention relates to circuit interrupters
in general and, more particularly, to circuit in
terrupters which e?ect arc extinction by a blast
of an arc extinguishing ?uid.
An object of my invention is to provide an im
proved circuit interrupter in which rapid extinc
tion of the arc produced upon opening the circuit
interrupter is brought about by converging two
(01. 200-150)
2
Fig. 2 is a View similar to that of Fig. 1 but
mowing the circuit interrupter of Fig. 1 in the
partially open circuit position;
Fig. 3 is a view in cross section taken along the
line III-III of Fig, 1;
Fig. 4 is a view in cross section of another
circuit interrupter embodying my invention and
shown in the partially open circuit position;
streams of ?uid upon the arc.
Fig. 5 is a view in cross section taken along the
Another object of my invention is to provide 10 line V-—V of Fig. 4;
an improved circuit interrupter in which two
Fig. 6 is a view in cross section of still another
serially related arcs are drawn and to effect the
circuit interrupter embodying my invention and
rapid interruption of one of said arcs by subject
ing it immediately upon establishment to a stream
of fluid.
Another object of the invention is to provide
an improved circuit interrupter in which both a
pressure generating arc and an interrupting are
are established and to employ the pressure cre
shown in the partially open circuit position; and
Fig. 7 is a view in cross section taken along the
line VII—VII of Fig. 6.
Referring to the drawings, and more particu
larly to Figure 1, the reference numeral i desig
nates generally a substantially enclosed are ex
tinguishing structure completely immersed in an
ated by the pressure generating arc to create two 20 arc extinguishing liquid, in this instance oil.
streams of fluid converging on the interrupting
The arc extinguishing structure I comprises a top
arc, and to provide suitable means for preventing
metallic cover plate 2 which encloses at its upper
contaminated fluid adjacent said pressure gener
end a cylindrically shaped insulating casing 3.
ating are from coming in contact with said inter
A stationary contact 4 comprises, in this instance,
rupting arc.
25 an integral portion of the top metallic cover plate
Another object of my invention is to provide
2 and cooperates with a rod-shaped intermediate
an improved circuit interrupter in which two
contact 5 to establish a pressure generating are
serially related arcs are established and to asso
5 more clearly shown in Fig. 2. Rigidly secured
ciate a piston with the intermediate contact of
to the intermediate contact 5 is a metallic piston
said interrupter and also to provide a suitable 30 ‘I movable within a piston cylinder 5! 0r piston
icy-passing channel by-passing said piston struc
chamber, the lower end of which is freely open.
ture so that there results two streams of con
The intermediate contact 5 and the piston ‘i rig
verging ?uid directed at one of said serially re
idly secured thereto are biased downward by the
lated arcs.
compression spring 8 which seats at its upper end
In the patent application of Benjamin P. Baker 35 against a stationary metallic spider member 9
and Winthrop M. Leeds, Serial No. 458,778, ?led
and seats at its lower end against a pin [0 which
September 18, 1942, and issued March 27, 1945,
extends through an aperture ll provided in the
as Patent No. 2,372,589, and assigned to the as
intermediate contact 5.
signee of the instant application is described and
A movable contact I2 cooperates with the in
claimed an improved circuit interrupter in which 40 termediate contact 5 to form an interrupting arc
a piston is secured to and movable with the in
i3 more clearly shown in Fig. 2". The movable
termediate contact to provide a ?ow of are ex
contact [2 is guided by a metallic bearing !4 in
tinguishing fluid against the interrupting arc of
serted in an aperture l5 provided in the insulat
the circuit interrupter. My invention is con
ing plate is, forming a portion of the insulating
cerned with numerous improvements of the cir 45 casing 3.
cuit interrupter described in the aforesaid patent
A plurality of insulating arc splitters I‘! are
application.
provided adjacent the interrupting arc l3 within
It will be apparent to one skilled in the art
a venting passage 50 leading out of the structure.
that my invention is applicable in some of its
However, it is to be clearly understood that other
aspects to circuit interrupters employing a gase 50 suitable interrupting structure may be used in
one are extinguishing medium, such as air, but
place of the arc splitters I‘! to facilitate the inter
merely for purposes of illustration, and not by
ruption of the interrupting are It during the
opening operation of the circuit interrupter. A
by-passing channel I 3 is provided to transmit
Further objects and advantages will be readily 55 liquid from the pressure generating are 6 toward
apparent upon a reading of the following descrip
the interrupting arc iii. In this instance the
tion taken in conjunction with the drawings in
by-passing channel l8 extends nearly half-way
which:
around the insulating casing 3, as Fig. 3‘ more
Figure I is a view in cross section of a circuit
clearly shows. To prevent a reverse ?ow of liquid
interrupter embodying my invention and? shown
through the by-passing channel [8, that is, to
in the closed circuit position;
ward the pressure generating are 6, a plurality
way of limitation, I describe my invention as
embodied in an oil immersed circuit interrupter.
"2,412,897
3
,
4
During the interruption of small currents the
pressure created within the pressure generating
chamber 22 by the pressure generating are 6 may
be very small, and in this event it will be noted
that the compression spring 8 forces the piston
of ?ap valves I9 are provided which cooperate
with apertures 20 drilled through an annular
partition plate 2| in the insulating casing 3._
It will be noted that the annular partition
plate 2| (see Fig. 3) creates a pressure generat
‘I down to provide a flow of oil toward the inter
rupting arc :3 as indicated by the arrows 21 of
ing chamber generally designated by the refer
ence numeral 22 (see Fig. 1) and an interrupting
Fig. 2. During the interruption of small currents
there might be a tendency for the oil moved
downwardly by the piston ‘I to flow in a reverse
pressure generating chamber 22 to permit fresh
direction through the by-passing channel I8, and
oil to enter the pressure generating chamber 22
to prevent such a possible reverse flow I have
following a circuit opening operation. During
provided
the flap valves I9 in the by-passing
high pressure conditions within the pressure gen
channel I8 which will immediately close.
erating chamber 22 the inlet valve 24 will close
Hence during the interruption of high currents,
as more clearly seen in Fig. 2.
the presence of the by-passing channel I8 effec
The operation of the circuit interrupter shown
tively relieves high pressure conditions within the
in Figs. 1, 2 and 3 will now be explained. In the
pressure generating chamber22 and simultane
closed circuit position of the interrupter the mov
ously provides a second stream of oil which coop
able contact i2 engages the intermediate contact
5 holding the latter in abutting engagement with 20 erates with the stream of oil caused by the piston
motion to merge at the interrupting arc l3 and
the stationary contact 4 maintaining the com
force the latter against the arc splitters ll. Dur
pression spring 8 in a compressed state. The elec
ing
the interruption of small currents the com
trical circuit through the interrupter in the closed
pression spring 8 produces the desired motion of
circuit position comprises the line cable 25, the
top metallic cover plate 2, stationary contact 4, 25 the piston l and the flap valves I9 prevent the
liquid from flowing in a reverse direction through
intermediate contact 5 and movable contact l2.
the Icy-passing channel it toward the pressure
When it is desired to open the electrical circuit
generating are 6.
passing through the interrupter the movable con
After the interrupting arc I3 has been extin
tact I2 is drawn down by suitable operating
guished the pressure within the insulating casing
mechanism, not shown. The intermediate con
3 will diminish to permit the inlet valve 24 to
tact 5 tends to follow the downward motion of
open, as shown in Fig. 1, ‘and hence to permit
the movable contact I2 because of the down
fresh oil to flow into the insulating casing 3
ward biasing action exerted by the compression
through the inlet valve 25 and between the arc
spring 8. However, because the piston ‘l is rigidly
chamber generally designated by the reference
numeral 23. An inlet valve 24 is provided in the
splitters M.
It will be noted that the compression spring
secured to the intermediate contact 5 there is a
slightdashpot action and as a result the inter
mediate contact 5 does not move down as rapidly
as the movable contact I2. Consequently, both
a pressure generating are 6 and an interrupting
arc I3 are established as clearly shown in Fig. 2.
It will be observed that the interrupting arc I3
8 serves two functions, (1) to accelerate the inter
mediate contact 5 toward the open circuit posi
the arc splitters I1 and vent passages 55) so that
tion, and (2) to produce the downward motion
of the piston 7 during the interruption of small
currents. It will also be noted that the portion
28 of the insulating casing 3 necessitates oil ?ow
through the aperture 26, and hence in such a
the ?ow of fluid can extinguish the are as soon as
direction as to cooperate with the oil flow through
is initially established immediately adjacent to
it is formed.
-
the by-passing channel l8 to force the interrupt
.
ing arc I3 to the right, as viewed in Fig. 2,
against the arc splitters I7. It will furthermore
During the interruption of large currents the
pressure created within the pressure generating
chamber 22 by the pressure generating are 6 will
be observed that by having the lay-passing chan
nel I8 of a width which extends approximately
act on the upper surface of the piston ‘I to assist
the downward motion of the intermediate con 50 half way around the insulating casing 3 (see Fig.
3) the oil ?ow transmitted by the by-passing
tact 5 and hence to force clean oil of high di
channel I3 strikes the interrupting arc I3 through
a substantial portion of the periphery of the in
terrupting are it‘. Consequently, the lateral pres
electric strength through the aperture 25 and in
the direction of the arrows 21 (see Fig. 2).
An important feature of my invention is the
manner in which I have relieved excessive pres
sure within the pressure generating chamber 22
sure on the interrupting arc I3 is maintained so
that when the gas bubble created by the inter
rupting arc I3 decreases in its diameter as the
current approaches its Zero value, deionization of
during the interruption of large currents by pro
viding the by-passing channel I8. This by
passing channel !8 completely by-passes the
stream of oil caused by the downward motion of
the piston ‘I and because of its length provides
the arc space is more readily e?ected.
an independent passage for the ?ow of clean oil
toward the interrupting arc I3. It will conse
7
quently be observed that two streams of oil con
verge on the interrupting arc I3. One of these 65
streams, which is substantially longitudinal of
the interrupting arc I3, is created by the down
ward motion of the piston ‘I, whereas the other
stream of oil through the by-passing channel I8
is substantially transverse to the interrupting
arc I3. By providing two streams of oil which
merge at the interrupting arc I3 to force the
interrupting arc l3 laterally against the are split
ters I‘! a very e?ective interruption of the inter
rupting arc I3 results.
I
Figs. 4' and 5 illustrate a circuit interrupter
similar in construction and operation to the cir
cuit interrupter just described in connection with
Figs. 1, 2 and 3. Similar reference numerals des
ignate corresponding parts. It will be noted that
a plurality of pistons 29, in this instance three,
are operative in piston chambers 30. A com
pression spring 3| seated at its lower end on a
spider 32 serves to bias the pistons 29 upward
against the stop 33. A plurality of apertures
34 are drilled through the pistons 29.
A valve
35, having a valve stem 36, is biased upward by
the compression spring 31. A pin 38 projecting
through the lower portion of the valve stem 36
serves as a stop for the upward motion of the
75 valve 35 with respect to the piston 29. In this
5
2,412,897‘
instance three pistons‘ 29 are provided to en-'
able‘ the‘ by-passing channel l8 to extend part
way around the insulating casing 3, as Fig. 5
more clearly shows; A bleeder opening 39 is
provided for the pressure’ generating chamber 22.
Thev operation of the circuit interrupter shown
in Figs. 4 and‘ 5' will‘ now be explained. In the
closed circuit position of the interrupter the
movable contact 12 engages the intermediate con
tact 5 raising the latter into abutting engage
ment with the stationary contact 4 against the
downward biasing action exerted by the com
6
latter sldewardly against the arcing splitters I‘!
to effect a rapid extinction of the interrupting
are 13.
After the interrupting arc has been extin
gui'shed, the pressure Within the insulating cas
ing 3 will subside, the pressure within the pres
sure generating chamber 22 decreasing because
of the presence of the bleeder opening 39. When
the pressure has subsided sui‘n‘ciently within the
10 pressure generating chamber 22 the inlet valve
24 will open. When this occurs the pressure will
rapidly decrease in the pressure generating
pression spring 8. The electrical circuit through
chamber 22 and the valves 35 will be raised by
the interrupter comprises the line cable 25, the
the compression springs 3'! to uncover the aper
top metallic cover plate 2, stationary contact 4, 15 tures 34 in the pistons 29. The pistons 29 will
intermediate contact 5 and movable contact l2.
be retracted by the compression springs 3| to
In the closed circuit position of the interrupter
their upper positions against the stops 33. The
the inlet valve 24 is open and the pistons 29 are
circulation of the oil through the insulating cas~
in their upward position abutting against the
ing 3 as permitted by the openings between the
stops 33 being biased in this position by the com 20 arcing splitters ll, the uncovering of the apere
pression springs 3|. The valves 35 in the pis
tures‘ 34 in the pistons 29 and the presence of
tons 29 are also in their upward position caused
the bleeder opening 39 and the inlet valve 24 all
by the biasing action of the compression spring
contribute to result in a rapid reflushing of the
31 and hence uncover the apertures 34. Since the
contaminated oil resulting from the previous in
inlet valve 24 is‘ open, the apertures 34 are un
covered, and the bleeder opening 39 is open, fresh
oil‘ may readily enter the pressure generating
chamber‘ 22 and circulate therethrough carrying
out decomposed products of decomposition re
sulting from the previous operation of the inter
rupter. The openings between the arc splitters
l1 permit fresh oil to also circulate through the
25
terrupting operation.
It will thus be apparent that in the interrupter
shown in Figs. ll and 5 I have provided a novel
construction to insure that no contaminated oil
of relatively low dielectric strength will pass from
the pressure generating are 6 through the by
passing channel I9 and into the interrupting arc
l3 to tend to lower the dielectric strength of the
oil adjacent the interrupting arc l3.
34, now uncovered, and into the pressure gen~
During the interruption of small currents the
crating chamber 22.
pressure generated within the pressure generat
When it is desired to open the interrupter the
ing chamber 22 will be low‘. Consequently the
movable contact 12 is drawn down by suitable
compression spring 8' is relied upon in this event‘
mechanism, not shown, to effect, as previously
to cause the downward movement of the piston
described, a pressure generating are 6 between
‘l and to produce thereby the oil ?ow adjacent
the stationary contact 4 and intermediate con 40 the interrupting arc [3. The low pressure within
tact 5,, and an interrupting arc l3 established be
the pressure generating chamber 22 will be suf
tween intermediate contact 5 and movable con
?cient, however, to close the valves 35 held open
tact 12. During the interruption of high current
by the weak compression springs‘ 31 and hence
the. pressure generated by the pressure generating
to prevent reverse ?ow through the by-passing
are 6 within the pressure generating chamber 22 ‘- channel I8.
will‘ be high and will cause the inlet valve 24 to
In the circuit interrupter embodying my in
close. The pressure within the pressure gener
vention and shown in Figs. 6 and 7 there is pro
ating chamber 22 will act upon the upper face of
vided a cylindrically shaped insulating casing 42
the piston 1 forcing the latter downward and
having an annular by-passing channel 43. A
thus assisting the compression spring 8. The
tubular movable contact 44 forming the vent
pressure within the pressure generating cham
ing passage 50 engages an enlarged portion 45 of
ber 22 will also close the valves 35 since the com
the intermediate contact 5 to raise the latter
pression springs 3'! are weaker than the com
against the stationary contact 4 in the closed
pression springs 3|, thus closing the apertures 34
circuit position of the interrupter not shown. In
in the pistons 29 and causing downward motion ~, the closed circuit position the electrical circuit
of the pistons 29 compressing the compression
through the interrupter comprises the line cable
spring 3|.
25, the top metallic cover plate 2, stationary con
It will therefore be apparent that oil will
tact 4, intermediate contact 5, enlarged portion
stream through the aperture 25 caused by the
45 and movable tubular contact 44.
downward motion of the piston l to create a lon 60
The operation of the circuit interrupter shown
gitudinal ?ow of oil adjacent the interrupting
in Figs. 6 and '7 will now be explained. When
are [3. It will also be apparent that uncontam
it is desired to open the electrical circuit through
inated oil of high dielectric strength will be
the interrupter the movable tubular contact 44
caused to ?ow through the by-passing channel
is moved downwardly by suitable operating mech
[8" as a result of the downward motion of the
anism, not shown, to effect in a manner previ
three pistons 29 in the three piston chambers 30.
ously described a pressure generating are 6 and
The clean. oil flowing through the by-passing
an interrupting arc 13. As clearly shown in Fig.
channel l3 strikes the interrupting arc l3 sub
6 the pressure generated by the pressure generat
stantially transversely thereto and through a
ing are 6 within the pressure generating cham
considerable portion of the periphery of the in
ber 22 will act on the upper face of the piston
terrupting arc l3 because of the use of three pis
'I to assist the compression spring 8 in moving
tons. 29 and the consequent width of the by
the piston l downwardly, causing fresh clean oil
passing channel l8. The two streams of oil flow
of high dielectric strength to pass in a direction
interrupting chamber 23, through the apertures
caused by the piston l. and the three pistons 29
indicated by the arrows 46 longitudinal of the
Will merge at the interrupting arc l3 to force the 75 early formed part‘ of the interrupting are I3 and
2,412,897
7
,
discharging through the movable tubular con
8
ing are within the pressure-generating chamber,
a movable contact separable from the intermedi
ate contact to establish an interrupting arc, a
piston attached to and movable with the inter
the pressure created by the pressure generating
are 6 within the pressure generating chamber Ch mediate contact, a piston cylinder within which
the piston moves and having an open passage
22 will open the ?ap valves l9 and cause oil to
therefrom at the time when the interrupting
flow through the annular by-passing channel 43
arc is ?rst established to permit ?uid moved by
transverse to the interrupting arc l3 and through
the piston to strike the interrupting arc, a vent
the movable contact at. It will be noted in this
embodiment of my invention that the oil ?ow 10 ing passage open at the time. when the interrupt
ing arc is ?rst established and leading from
through the annular by-passing channel 43 is
within the substantially enclosed arc extinguish
directed radially inwardly toward the interrupt
ing structure to the exterior thereof, said inter
ing arc l3 and substantially transverse thereto.
mediate and movable contacts having their point
This transverse flow through the annular by
of initial separation immediately adjacent to said
passing channel 133 cooperates with the ?ow cre
venting passage so that the ?uid ‘?ow strikes the
ated by the piston I in moving the lower termi
early formed part of the interrupting arc in
nal of the interrupting arc l3 down along the
passing out through the venting passage, a by
inner wall 48 of the movable tubular contact 44.
passing channel leading from the pressure-gen
Since the interrupting arc I3 is rapidly length
ened by the movement of its lower terminal, and 20 erating arc to the interrupting arc, and biasing
means to bias both the movable intermediate
since it is subjected to the combined action of
contact and the piston to move within the piston
the oil ?ow through the annular by-passing
cylinder.
channel 43 and the longitudinal oil ?ow creat
3. In a fluid circuit interrupter, means de?ning
ed by the downward motion of the piston 1 the
interrupting are [3 is very rapidly extinguished. 25 a substantially enclosed arc extinguishing struc
ture having a substantially enclosed pressure
After the interrupting are 13 is extinguished
generating chamber therewithin, a relatively sta
the pressure subsides within the insulating cas
tionary contact, an intermediate contact sep
ing 42 and the inlet valve 2!’; opens to circulate
tact 44 as indicated by the arrow 41.
Also during the interruption of high currents
‘fresh oil through the insulating casing 42.
arable therefrom to establish a pressure-gen
During the interruption of small currents the 301 erating are within the pressure-generating cham
ber, a movable contact separable from the inter
compression spring 8 will produce the desired
mediate contact to establish an interrupting arc,
downward movement of the piston l and the
a piston attached to and movable with the in
?ap valves I9 will prevent any reverse oil ?ow
termediate contact, a piston cylinder within which
upward through the annular by-passing chan
the piston moves and having an open passage
nel 43 toward the pressure generating arc 6.
therefrom at the time when the interrupting arc
Although I have shown and described speci?c
is ?rst established to permit ?uid moved by the
structures, it is to be clearly understood that
piston to strike the interrupting arc, a venting
the same were merely for purposes of illustra
passage open at the time when the interrupting
tion and. that changes and modi?cations may be
made by those skilled in the art without depart 40 arc is ?rst established and leading from within
the substantially enclosed arc extinguishing
ing from the spirit and scope of the appended
structure to the exterior thereof, said intermedi
claims.
ate and movable contacts having their point of
I claim as my invention:
initial separation immediately adjacent to said
1. In a fluid circuit interrupter, means de?n
ing a substantially enclosed arc extinguishing 453 venting passage so that the ?uid ?ow strikes
structure having a substantially enclosed pres
passing
the earlyout
formed
through
partthe
of venting
the interrupting
passage, arc
a by
sure-generating chamber therewithin, a relatively
passing channel leading from the pressure-gen
stationary contact, an intermediate contact sep
erating arc to the interrupting arc, and means
arable therefrom to establish a pressure-generat
in the by-passing channel to prevent a reverse,
ing arc within the pressure-generating chamber,
?ow 0f ?uid within the channel toward the pres
a movable contact separable from the intermedi
ate contact to establish an interrupting arc, a
piston attached to and movable with the in
termediate contact, a piston cylinder within which
the piston moves and having an open passage
sure-generating arc during low ‘ current inter
ruption.
4. In a fluid circuit interrupter, means de?ning
a substantially enclosed arc extinguishing struc
ture having a substantially enclosed ' pressure
therefrom at the time when the interrupting
generating chamber therewithin, a relatively sta
arc is ?rst established to permit fluid moved by
the piston to strike the interrupting arc, a vent
tionary contact, an intermediate contact sep-J
arable therefrom to establish a pressure-generat
ing passage open at the time when the inter
rupting arc is ?rst established and leading from 60 ing arc within the pressure-generating chamber,
within the substantially enclosed arc extin
a movable contact separable from the intermedi
guishing structure to the exterior thereof, ,said
ate contact to establish an interrupting arc, a
intermediate and movable contacts having their
piston attached to and movable with the inter
point of initial separation immediately adjacent
mediate contact, a piston cylinder within which
to said venting passage so that the ?uid ?ow
the piston moves and having an open passage
strikes the early formed part of the interrupting
therefrom at the time when the interrupting
arc in passing out through the venting passage,
arc is ?rst established to permit ?uid moved by
and a by-passing channel leading from the pres
the piston to strike the interrupting are, a vent
sure-generating arc to the interrupting are.
ing passage open at the time when the inter
2. In a ?uid circuit interrupter, means de?ning
rupting arc is ?rst established and leading from
a substantially enclosed arc extinguishing struc
within the substantially enclosed arc extinguish
ture having a substantially enclosed pressure
ing structure to the exterior thereof, said inter
generating chamber therewithin, a relatively sta
mediate and movable contacts having their point
tionary contact, an intermediate contact sep
of initial separation immediately adjacent to said
arable therefrom to establish a pressure-generat 75 venting passage so that the ?uid ?ow strikes the
9
2,412,897
10
early formed part of the interrupting arc in
passing out through the venting passage, a by
passing channel leading from the pressure-gen
crating arc to the interrupting arc, biasing means
to bias both the movable intermediate contact
and the piston to move within the piston cylinder,
and means in the by-passing channel to prevent
arcs and comprising a relatively stationary con
tact disposed at one end of the arc extinguish
ing structure, a movable intermediate contact
and a hollow tubular contact, the hollow tubular
01
contact providing a venting passage out of the
arc extinguishing structure, a piston chamber
within the arc cXtinguishing structure, a piston
secured to the intermediate contact and movable
a reverse ?ow of ?uid within the channel toward
the pressure-generating arc during low current
interruption.
within the piston chamber, said intermediate
5. In a ?uid circuit interrupter, a substantially
enclosed arc extinguishing structure, the upper
end of the structure forming a pressure-gener
make engagement with the hollow tubular con
tact, an opening from the piston chamber per
contact being elongated and having one end
thereof extending beyond the piston chamber to
ating chamber, a relatively stationary contact,
mitting the fluid forced out by the piston to strike
a rod-shaped intermediate contact separable
therefrom to establish a pressure-generating are
within the pressure-generating chamber, a piston
the interrupting arc established between the in
termediate and hollow tubular contacts and pass
out of the substantially enclosed arc extinguish_
chamber formed intermediate the ends of the
structure and having an openingr from the lower
end thereof, a piston movable within the piston
chamber and secured to and movable with the
ing structure through the venting passage pro
vided by the hollow tubular contact, and a by
passing channel around the piston chamber per
rod-shaped intermediate contact, the lower end
of the rod-shaped intermediate contact extend
ing below the piston chamber, a lower movable
contact separable from the lower end of the rod
shaped intermediate contact to establish an inter
rupting arc, venting means disposed adjacent the
point of initial separation of the lower movable
contact from the rod-shaped intermediate con
tact and leading to the exterior of the structure .
mitting ?ow of ?uid from the pressure-generat
ing arc to the interrupting arc.
8. In a ?uid circuit interrupter, a substantially
enclosed arc extinguishing structure, contact
structure operable to establish two serially related
arcs and comprising a relatively stationary con
tact disposed at one end of the arc extinguishing
structure, a movable intermediate contact and
a hollow tubular contact, the hollow tubular con
tact providing a venting passage out of the arc
so that the interrupting arc is initially established
immediately adjacent to the venting means and
the ?uid forced downwardly by the piston within
the piston chamber strikes the ?rst formed part
extinguishing structure, a piston chamber with
in the arc extinguishing structure, a piston
secured to the intermediate contact and movable
of the interrupting arc and passes out of the ‘
contact being elongated and having one end
thereof extending beyond the piston chamber to
structure through the venting means, and a by
passing channel extending from the pressure
generating chamber to a point adjacent the in
terrupting arc.
6. In a ?uid circuit interrupter, a substan
tially enclosed arc extinguishing structure, the
make engagement with the hollow tubular con
tact, an opening from the piston chamber per
mitting the ?uid forced out by the piston to
40 strike the interrupting are established between
the intermediate and hollow tubular contacts and
upper end of the structure forming a pressure
pass out of the substantially enclosed are ex—
generating chamber, a relatively stationary con
tact, a rod-shaped intermediate contact separable
tinguishing structure through the venting pas
sage provided by the hollow tubular contact, a
therefrom to establish a pressure-generating arc
by-passing channel around the piston chamber
within the pressure-generating chamber, a piston
chamber formed intermediate the ends of the
structure and having an opening from the lower
end thereof, a piston movable within the piston
chamber and secured to and movable with the 50
rod-shaped intermediate contact, the lower end
of the rod-shaped intermediate contact extend
ing below the piston chamber, a lower movable
within the piston chamber, said intermediate
permitting flow of ?uid from the pressure
generating arc to the interrupting arc, biasing
means to bias the movable intermediate contact
and the piston to move within the piston cham
ber, and means for preventing reverse ?ow with
in the by-passing channel toward the pressure
generating are.
9. In a ?uid circuit interrupter, a substantially
contact separable from the lower end of the
enclosed arc extinguishing structure, a piston
rod-shaped intermediate contact to establish an 55 chamber interiorly thereof and having an open
interrupting arc, venting means disposed ad
ing therefrom at one end, a relatively stationary
jacent the point of initial separation of the lower
contact, a movable intermediate contact sep
movable contact from the rod-shaped inter
arable therefrom to establish a pressure-gen
mediate contact and leading to the exterior of
erating are adjacent the other end of the piston
the structure so that the interrupting arc is 60 chamber, venting means leading out of the sub
initially established immediately adjacent to the
stantially enclosed structure, a movable contact
venting means and the ?uid forced downwardly
separable from the intermediate contact to in
by the piston within the piston chamber strikes
the ?rst formed part of the interrupting arc and
passes out of the structure through the venting
means, a by-passing channel extending from the
pressure-generating chamber to a point adjacent
the interrupting arc, and means in the by-passing
channel to prevent reverse upward ?ow toward
the pressure-generating arc during low current
interruption.
'7. In a ?uid circuit interrupter, a substantially
enclosed arc extinguishing structure, contact
structure operable to establish two serially related
itially establish an interrupting are immediately
adjacent to the venting means, piston means
responsive to movement of the intermediate
contact and movable within the piston chamber
to cause ?uid to flow out the open end thereof
and strike the ?rst formed portion of the inter
rupting arc in passing out of the structure
70 through the venting means, and a by-passing
channel extending around the piston chamber
to permit ?uid ?ow from the pressure-generating
arc to the interrupting arc.
JOHN B. MAcNElLL.
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