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Патент USA US3036253

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May 22, 1962
3,036,243
W. _E. GLASS BURN
TIME DELAY INDUCTION RELAY WITH QUICK RESET
Filed May 26, 1958
Fig.l.
49
69
29
_
_
INVENTOR
W||l|om E. Glossburn.
BY
@M w
I
United grates Patent 0”
1
3,?3h,243
Patented May 22, 19162
2
to movement of the disc away from its reset position
3,036,243
Tilt/IE DELAY INDUCTHQN RELAY WHTH
_ _
Q‘UXCK RESET
William E. Glassburn, Mountainside, NJ, assignor to
Westinghouse Electric (Iorporation, East Pittsburgh,
Pa., a corporation of Pennsylvania
Fried May 26, 1953, Ser. No. 737,672
6 Claims. (Cl. 317-36)
toward its control position and to prevent operation of
the damping system when the disc moves toward its reset
position. The control means is preferably in the form
of a unidirectional element which is connected in series
relation with the electroconductive wire forming the
closed loop. The unidirectional element may constitute
a conventional diode recti?er and is poled so as to permit
the ?ow of current about the loop when the loop moves
This invention relates to instrument devices and has 10 through the magnetic ?eld in response to movement of
particular relation to instruments such as relays of the
the disc away from its reset position and to prevent the
induction type having time-delay characteristics.
?o-w of cur-rent about the loop as the loop moves through
the field when the disc is rotating towards its reset posi
The present invention is applicable to instruments of
various forms, and will be described in connection with
tion.
an induction instrument of the type having an electro
It is, therefore, an object of the invention to provide a
time-delay instrument of improved construction.
conductive armature movable under the in?uence of an
electromagnetic driving system. Such induction instru
It is another object of the invention to provide a time
delay instrument having a driving system in?uencing an
ments may include damping means for damping move
armature with an armature damping system including an
ment of the'armature when the driving system is ener
gized to a predetermined level e?ective to move the 20 electroconductive closed loop having a loop side movable
armature.
with the armature through an air gap provided by a pair
of annular spaced concentric pole pieces of a magnetic
Improved control means are provided in the present
invention to eliminate the damping when the energization
?eld system.
It is a further object of the invention to provide a time
of the driving system falls below the predetermined level.
This arrangement enables a desirable quick return of the 25 delay instrument having a driving system acting upon an
armature with damping means in?uencing the armature
armature to its initial reset position when the energiza
and control means for permitting operation of the damp
tion of the driving system is reduced below the level e?ec
tive to move the armature away from its reset position.
ing means in response to movement of the armature away
from a reset position and preventing operation of the
in the present invention, ‘damping means of improved
construction is provided to in?uence the armature with 30 damping system when the armature moves towards its
control means effective to permit operation of the damp
reset position.
It is still another object of the invention to provide a
ing means in response to movement of the armature away
from the reset position towards a spaced controlling posi
time-delay instrument having a driving system acting
tion such as a circuit breaker tripping position. The con
upon an armature vwith damping means in?uencing the
trol means is further effective to prevent operation of the 35 armature including an electroconductive loop mounted
damping means in response to movement of the armature
for movement with the armature through a magnetic
toward its reset position resulting from a decrease in the
?eld, and control means for permitting current ?ow about
‘in
energization of the driving system below the predeter
the loop when the armature moves away from its reset
mined level.
According to a preferred embodiment of the invention,
the armature is in the form of a disc mounted by a shaft
for rotation with respect to the driving system. A suit
able bias spring is associated with the shaft which biases
the disc toward its reset position. The damping means
the armature moves toward its reset position.
it is a still further object of the invention to provide
an instrument as de?ned in the preceding paragraph
wherein the control means comprises a diode recti?er
connected in series relation with the conductor of the
position and preventing current ?ow about the loop when
is preferably of the electromagnetic type and is in the
loop.
form of a pair of relatively movable magnetic ?eld and 45
Other objects of the invention will become apparent
electroconductive closed loop systems. One of these sys
from the following description, taken in conjunction with
tems is carried by the moving system of the relay for
the accompanying drawings, in which:
rotation with the relay disc.
FIGURE 1 is a schematic representation of an electri
The ?eld system may include a pair of substantially
cal system including an induction relay with parts shown
annular non-permanent magnetic pole pieces mounted in 50 in section and with parts removed; and
spaced concentric relation with each other to de?ne an
FIG. 2 is a view in top 'plan of the relay of FIG. 1
air gap arcuate about the axis of concentricity. Suitable
with parts removed.
7
magnetic ?ux producing ‘means, preferably in the form
Referring to the drawing, there is illustrated in FIG. 1
of a permanent magnet, is located to establish a magnetic
an electrical system represented generally by the numeral
?eld in the air gap which is substantially uniform through
1 including an electrical circuit 3. The circuit 3 is ii
out a considerable portionv of the air gap. The closed
lustrated as including three conductors 5, 7 and 9, and
loop system may include a closed loop formed of a plu
may be either a three—phase, alternating-current circuit
rality of turns of electroconductive wire having a side
or a single-phase, three-wire alternating-current circuit.
extending through the air gap parallel to the axis of con
It will be assumed that the circuit 3 is operating at a
60 frequency of 60 cycles per second.
centricity.
In a preferred ‘embodiment of the invention, the closed
In order to permit interruption and establishment
loop is secured to the moving system of the relay for
of the circuit 3, there is provided a suitable circuit breaker
movement with respect to the magnetic ?eld system in
11 illustrated as having a trip coil 18 which is effective
response to movement of the armature. The closed loop
when energized to operate the breaker 11 for inter
is conveniently secured to the shaft which supports the 65 rupting the circuit 3. The trip coil 13 is to be energized
disc such that the loop is movable about the axis of the
in response to the ?ow of excessive current in the circuit
shaft in accordance with movements of the disc. With
3 to operate the breaker 11 for protecting the circuit 3
this arrangement, movement of the loop with respect to
from damage due to such excessive current.
the ?eld system results in the establishment of a damping
In order to control energization of the trip coil 13,
effect upon the disc.
the
present invention provides an instrument in the
According to the invention, control means are provided
form of an overcurrent relay device represented generally
to permit operation of the damping system in response
3,036,243
3
by the numeral 15 which preferably possesses time~delay
characteristics.
The relay 15 is illustrated as being of
the induction type and includes an electroconductive ar
mature 17, preferably in the form of a disc which is
mounted for rotation in any suitable manner by a sup
porting shaft :19. A spiral spring 21 has an inner end
connected to the shaft 19 and an outer end connected
to a portion of the stator structure of the relay to bias
the shaft 19 and the disc 17 in a clockwise direction, as
viewed from the upper end of the shaft 19.
is surrounded in spaced relation by an annular outer pole
piece 57. The pole pieces 55 and 57 may be formed of
any suitable non-magnetic material, such as soft iron.
It is observed with reference to FIGS. 1 and 2 that the
pole pieces 55 and 57 are positioned with the axis of
concentricity common to the axis of the shaft v19 such
that the pole pieces de?ne an air gap 59 which is arcuate
about the axis of the shaft 19. The pole pieces 55 and
57 may be secured in position in any suitable manner
such as by portions 61 of the stator structure of the re
In order to effect movement of the disc 17, there is
lay. Although the pole pieces 55 and 57 are illustrated
provided an electromagnetic driving system 23 of any
in FIGS. 1 and 2 as located above the disc 17, they may
suitable construction. The system 23 is illustrated in
be located in other positions, if desired. For example,
FIG. 1 as including a substantially C-shaped magnetic
the pole pieces may be positioned beneath the disc rather
structure 25 preferably formed of a plurality of lamina 15 than above the disc as viewed in FIG. 1.
tions 27 of any suitable magnetic material. The struc
In order to establish 1a magnetic ?eld‘ in the air gap
ture 25 includes an air gap in which a portion of the
disc 17 is positioned. A suitable winding 29 surrounds
a portion of the structure 25 to establish, when energized,
59, the ?eld system includes further a suitable permanent
magnet 63 which is illustrated in FIGS. 1 and 2 as po
sitioned in an enlarged portion of the air gap 59 to
a magnetomotive force which directs magnetic flux 20 engage spaced parts of the pole pieces 55 and 57. The
magnet 63 may be constructed of any suitable per
through the structure 25, the associated air gap and the
manent magnetic material and is magnetized with the
portion of the disc 17 in the air gap.
polarity illustrated in FIGS. 1 and 2 such that the mag
In order to establish a shifting magnetic ?eld in the
netic flux produced by the magnet extends in directions
‘air gap for effecting rotation of the disc 17 in response
to energization of the winding 29, a pair of electrocon 25 transverse to the axis of the shaft 19. In the embodi
ment illustrated in FIG. 1, the magnet 63 has north
ductive shading coils 3'1 and 33 are positioned to link
magnetic poles identi?ed by the letter N which are ad
portions of the magnetic ?ux traversing the structure 25.
jacent the outer surface of the inner pole piece 55" and
The winding 29 is connected for energization from the
south magnetic poles identi?ed by the letter S which are
conductors 5, 7 and 9 by means of current transformers
adjacent the inner surface of the outer pole piece 57.
35, 37' and 39 associated, respectively, with the conductors
This arrangement is effective to provide a substantially
5, 7 and 9. When the winding 29 is energized, a shift
uniform magnetic ?eld throughout the active portion
ing magnetic ?eld is established which effects rotation
of the air gap 59.
of the disc 17 in a counterclockwise direction, as viewed
The damping means 51 includes further an electro
from the upper end of the shaft 19.
. In order to effect a controlling function, the shaft 19 35 conductive loop system which is preferably carried by
the moving system of the relay for rotation relative to
has secured thereto an operating arm 41 which bears
against a suitable adjustable stop 43 under the influence
of the spring 21 when the driving system 23 is deener
gized. A pair of ?xed contacts 45 and 47 are mounted
the ?eld system 53 through the magnetic ?eld estab
lished thereby. In the embodiment of ‘FIG. 1, there is
illustrated an electroconductive closed loop 65 of rec
in ‘any suitable manner in spaced relation with each 40 tangular con?guration formed of a number of turns of
electroconductive wire 67, such as copper, to provide a
other and wit-h the operating arm 41. The contacts 45
pair of spaced parallel loop sides 69 and 71. The loop
and 47 are located in the path of movement of the arm
is conveniently secured to the shaft 19 in any suitable
41 such that the contact 47 may be moved into engage
manner such that one of the loop sides, such as the side
ment with the contact 45 in response to engagement of
71, extends through the air gap 59 parallel to the shaft
19. With this arrangement, the loop 65 is movable in
accordance with movements of the disc 17 through
the magnetic ?eld established in the air gap 59.
contact 45. If desired, the contact 45 may also be carried
As best shown in FIG. 2, the loop 65 is positioned at
by a spring support.
.
50 a location corresponding to the reset position of the
The contacts 45 and Y47 are connected in series relation
disc 17 when the winding 29 is deenergized. It is ob
in a circuit which includes the trip coil 13 and a suitable
served that the air gap 59 has a length dimension which
source of direct voltage which is represented by the con
is substantially uniform throughout an angle of approxi
ductors 49. When the contacts 45 and 47 are in engage
ment produced by predetermined rotation of the disc 17 55 mately 270° about the axis of the shaft 19. The magnet
the arm 41 with the contact ‘47 or its support. The con
tact 47 is preferably mounted on a suitable spring sup
port so as to be de?ectable towards and away from the
‘and the arm 4-1 in response to an overcurrent condition
of the circuit 3, the above-mentioned tripping circuit is
established which results in energization of the trip coil
13 and operation of the breaker 11 to interrupt the cir
cuit 3.
60
63 is located in a non-uniform portion of the air gap
59, which is spaced from the active uniform portion
thereof as clearly shown in FIG. 2. As a result, the
magnet 63 is clear of the path of movement of the
loop 65.
v‘In order to control operation of the damping means
51, the present invention provides suitable control means
e?ective to permit operation of the damping means when
the disc 17 is moved away from its reset position and
current in the circuit 3 and the time when the contacts
45 and 47 are moved into engagement. In the present 65 to prevent operation of the damping means in response
to movement of the disc toward its reset position.
invention, such a time delay is established by the provision
of damping means 51. According to the invention, the
In a preferred embodiment of the invention, the con
damping means 51 includes a pair of relatively rotatable
trol means is in the form of a unidirectional element 73
For various reasons, it is desirable that a substantial
delay be provided between the time of energization of
the winding 29 by a quantity representing an excessive
magnetic ?eld and electroconductive loop systems.
which may ‘constitute a conventional diode recti?er.
In the preferred embodiment illustrated, the damping 70 The diode 73 is connected in series relation with the
means 51 includes a magnetic ?eld system 53 compris
ing a pair of’ annular non-permanent magnetic pole pieces
wire 67 of the loop so as to permit current ?ow about
the loop when the disc 17 moves away from the reset
position and to prevent such current ?ow when the disc
mounted in spaced concentric relation to de?ne an air
gap arcuate about the axis of concentricity. As illus
is rotating towards its reset position. In the embodi
trated in FIGS. 1 and 2, an annual inner pole piece 55 75 ment illustrated in FIG. 2, the diode 73 is supported by
3,036,243
6
the loop 65 at the upper end of the loop. The diode may
‘be secured to the loop in any suitable manner.
With the arrangement illustrated, movement of the
driving means being effective when energized in accord
loop 65 in a counterclockwise direction as viewed in
FIG. 2 will result in the induction of a voltage in the
Wire 65 of the loop which directs current along the
reset position towards said control position, electromag
ance with an energizing quantity in excess of a preselected
amount to move said armature means away from said
upper end ‘of the loop ‘in the direction represented by
netic damping means effective when energized for damp
ing movement of said armature means, said damping
means including a constantly energized magnetic ?eld pro
the arrow 75 of FIG. 2. The diode 73 is so poled as
to permit such current flow with the result that the de
ducing device, and an electroconductive loop device link
ing the magnetic ?eld produced by said ?eld device, one
sired damping action is obtained.
When the loop is 10 of said devices being mounted for movement with said
moved in a clockwise direction as viewed in FIG. 2
in response to rotation of the disc 17 toward its reset
armature means relative to the other of said devices, and
current ?ow control means for controlling current ?ow
position, a voltage is induced in the Wire of the loop
through said loop for regulating the operation of said
which ‘tends to cause current, to flow along the upper
damping means, said control means being arranged to
end of the loop in the direction opposite to that indi 15 permit current flow through said loop in response to
cated by the arrow 75. This current ?ow, however, is
prevented due to the characteristic of the diode 73.
movement of said armature in one of said directions, and
As a result, no damping action is realized and the disc
17 is free to quickly rotate to its reset position under
to movement of said armature in a second of said
ence to certain speci?c embodiments thereof, numerous
modi?cations are possible and it is desired to cover only
said driving means under the influence of the driving
means, said armature means being movable between
to prevent current flow through said loop in response
directions.
the in?uence of the spring 21.
20
4. In a time-delay instrument, driving means, armature
Although the invention has been described with refer
means mounted for movement in two directions relative to
modi?cations falling within the spirit and scope of the
spaced reset and control positions, biasing means for
invention.
25 biasing the armature means towards the reset position,
I claim as my invention:
said driving means being effective when energized in ac
1. In a time-delay instrument, driving means, arma
cordance with an energizing quantity in excess of a pre
ture means mounted for movement relative to said driv
selected amount to move said armature means away from
ing means under the in?uence of the driving means,
said reset position towards said control position, electro
said armature means being movable between spaced 30 magnetic damping means effective when energized for
reset and control positions, biasing means for biasing
damping movement of said armature means towards said
the armature means toward the reset position, said driv
control position, said damping means including a mag
ing means being eifective when energized in accordance
netic ?eld producing device, and an electroconductive
with an energizing quantity in excess of a preselected
loop device linking the magnetic ?eld produced by said
amount to move said armature means away from said 35 ?eld device, one of said devices being mounted for move
reset position towards said control position, electro
ment with said armature means relative to the other of
magnetic damping means including energizable con
said devices, and control means for controlling operation
ductor means, said damping means being effective in
of said damping means, said control means comprising a
response to energization of said conductor means for
unidirectional element connected in series relation with
damping movement of said armature means towards said 40 the conductor of said loop, said element being poled to
control position, and an asymmetric current ?ow control
permit current flow about the loop resulting from move
device for controlling current ?ow through said conductor
means, said control device being arranged to permit cur
ment of said armature means in one of ‘said directions,
rent ?ow in said conductor means in response to move
ment of said armature means away from said reset po
movement of said armature means in a second of said
and to prevent current flow about the loop resulting from
sition towards said control position, and to restrict cur
directions.
5. In an induction instrument, electromagnetic driving
rent ?ow in said conductor means in response to move
ment of said armature means away from said control
means, electroconductive armature means mounted for
movement relative to said driving means under the in?u
position towards said reset position.
ence of the driving means, said armature means being
2. In a time-delay instrument, driving means, armature 50 movable between spaced reset and control positions,
means mounted for movement about an axis relative to
biasing means for biasing the armature means towards
said driving means under the influence of the driving
the reset position, said driving means being effective when
energized in accordance with an electrical quantity in
means, said armature means being movable between
spaced reset and control positions, biasing means for bias
excess of a preselected amount to move said armature
ing the armature means towards the reset position, said 55 means away from said reset position towards said control
driving means being effective when energized in accord
position, electromagnetic damping means effective when
ance with an energizing quantity in excess of a preselected
energized for damping movement of said armature means
amount to move said armature mean-s away ‘from said
towards said control position, said damping means in
reset position towards said control position, electromag
cluding a magnetic ?eld producing device, and an elec
netic damping means, said damping means including a 60 troconductive loop device linking the magnetic ?eld pro
magnetic ?eld producing device and an electroconductive
duced by said ?eld device, said loop device being mounted
loop device linking the magnetic ?eld produced by said
for rotation with said armature means relative to said
?eld device, one of said devices being mounted for move
ment with said armature means relative to the other of
?eld device, and control means for controlling operation
of said damping means, said control means comprising a
said devices, and means controlling current ?ow through 65 unidirectional element connected in series relation with
said loop device and effective to provide a greater degree
the conductor of said loop, said element being poled to
of energization of said loop device upon relative move
permit current flow about the loop resulting from move
ment of said devices in a ?rst direction than upon relative
ment of said armature means towards said control posi
movement in the opposite direction.
tion, and to prevent current ?ow about the loop resulting
3. In a time-delay instrument, driving means, armature 70 from movement of said armature means towards said
means mounted for movement relative to said driving
reset position.
means under the in?uence of the driving means, said
6. In an induction instrument, electromagnetic driving
armature means being movable in two directions between
means, electroconductive armature means mounted for
spaced reset and control positions, biasing means for bias
movement relative to said driving means under the in
ing the armature means towards the reset position, said 75 ?uence of the driving means, said armature means being
7
3,036,243
movable between spaced reset and control positions, bias
ing means for biasing the armature means towards the
reset position, said driving means being e?ective when
energized in accordance with an electrical quantity in ex
cess of a preselected amount to move said armature
means away from said reset position towards said control
position, electromagnetic damping. means e?ective when
energized tor damping movement of said armature
means towards said control position, said damping means
including a pair of substantially annular pole pieces 10
mounted in spaced concentric relation to de?ne ‘an air
gap arcuate about the axis of rotation of said armature
means, a permanent magnet positioned to establish a
magnetic ?eld in the air gap extending radially of said
axis, and an electroconductive loop mounted with a loop 15
side extending parallel to said axis through the air gap
for rotation with the armature means about the axis
relative to the pole pieces, and control means for con
trolling operation of said damping means, said control
means comprising a unidirectional element connected in
series relation with the conductor of said loop, said ele
ment being poled to permit current ?ow about the loop
resulting from movement of said armature means to
wards said control position, and to prevent current ?ow
about the loop resulting from movement of said armature
means towards said reset position.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,742,367
1,870,518
2,457,685
2,513,957
‘2,572,556
2,639,307
2,697,187
2,797,369
Nettleton, ____________ __ Jan. 7,
Leben ______________ __ Aug. 9,
Klepp ______________ __ Dec. 28,
Ogurkowski __________ __ July 4,
Zar __________________ __ Oct. 23,
Bakke ______________ __ May 19,
Sonnemann __________ __ Dec. 14,
Cordray ____________ __ June 25,
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