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Патент USA US2403103

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July 2, 1946.
W. M. LEEDS
2,403,103
.
OCIRGUIT INTERRUPTER
Filed Feb. 20. 1945
5 SheetS-I-Sheet 1
103 - 50
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ENVENTOR
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' W272 f/77’0/D M. L 666275.
A'E'TQRNEY
July 2, 1946.
2,403,103
w. M. LEEDS
CIRCUIT INTERRUPTER
Filed Feb‘. 20, 1943
5 Sheets-Sheet 2
INVENTOR
WZiYZ/‘ZZ'OP M Leeds.
6 BY 71/
'
ATTORNEY
July 2, ‘1946-7 ‘
w. M. LEEDS
2,403,103
CIRCUIT INTERRUPTER
Filed Feb. 20,‘194s
5 Sheets—Sheet 3
QI
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-
.
INVENT'OR
Winthrop M Leeds.
July T2, ‘1946I
2729.29;
w. M. LEEDS
CIRCUIT
2,403,103
INTERRUPTER'
I
Filed Feb. 20, 1943.
5 Sheets-Sheet 4
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INVENTOR
MHz/2250p MLeaa’s.
Mk
July 2, .1946.
2,403,103
W. M. LEEDS
CIRCUIT INTERRUPTER
s Sheets-Sheet 5
Filed Feb. 20, 1943
$73. 32
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ATTORNE
Patented July 2, 1946
2,403,103‘
UNITED STATES. PATENT OFFICE
CIRCUIT INTERRUPTER
Winthrop M. Leeds, Wilkinsburg, Pa., assignor to
Westinghouse Electric Corporation, East Pitts
burgh, Pa., a corporation of Pennsylvania
Application February 20, 1943, Serial No. 476,510
26 Claims. (Cl. 200-—-150)
1
.
This invention relates the circuit interrupters
in general, and, more particularly, to are extin
_
-
2
become apparent upon a reading of the fol
lowing speci?cation taken in conjunction with
the drawings, in which:
guishing structures therefor.
First, during the greater portion of time are
current is ?owing, particularly in the region of
Figure 1 is a View taken in vertical section on
line I—I of Fig. 3 of a circuit interrupter em
bodying my invention and shown in the open cir
the peak of the current wave, the arc should
be disturbed as little as possible by cross blasts,
cuit position;
.~
restricting walls, or strong magnetic action, so
Fig. 2 is a View taken substantially on the
as to keep the arc voltage and the consequent
line 11-11 of Fig. 1;
gas generation as low as possible. Second, vents, 10
Fig. 3 is a view in cross section taken on the
passages and liquid ?ow should be arranged to
line III-III of Fig. 1;
drive the products of decomposition of the are
out of the arc chamber as fast as they are formed
so as to maintain high dielectric in the arc
chamber and keep the internal pressure reason
Fig. 4 is a vertical sectional View taken on the
line IV—IV of Fig. 3;
Figs. 5 through 26 show plate details;
15
Fig. 27 is a plan view of a support plate;
ably low. Third, just prior to current zero when
the arc current is relatively low, strong deioniz
ing action should be brought into play, as for in
stance, subjecting the arc to turbulent cross
XXVIII—XXVIII of Fig. 27;
ment to produce rapid deionization, either sing
ly or in combination, though preferably the lat
of Fig. 29;
Fig. 28 is a sectional view taken on the line
Fig. 29 is an elevational view in vertical sec
tion taken through a modi?ed type circuit inter
blasts of liquid and gas, con?ning the arc with 20 rupter embodying my invention, the interrupter
in a restricted passage or rapidly moving or
being shown in the open circuit position;
lengthening the arc. These methods of treat
Fig. 30 is a view taken on the line XXX~QQCX
Fig. 31 is a view in section taken on the line
ter, insure complete interruption of the circuit 25 XXXI-XXXI of Fig. 29;
at current zero.
The main object of my invention is to provide
an improved arc rupturing device which func
tions in accordance with the aforementioned
principles.
Fig. 32 is a View in section taken on the line
XXXII—XXX_II of Fig. 31; and
Fig. 33 is an elevational view of 'a' circuit inter
so
rupter of the type shown in Fig. 29 supported
in a suitable casing, the parts being shown in the
open circuit position.
Referring to. the drawings and, more particu
larly, to Fig. 1 and Fig. 33, the reference numeral
I generally designates an arcextinguishing as
semblage comprising a plurality, in this instance
two, are extinguishing units 2 disposed within
Another object of my invention is to provide an
improved circuit interrupter in which the are
established is moved laterally, and to drive ?uid
at the are after it has moved laterally to eifect
its extinction.
Another object is to provide an improved cir
cuit interrupter in which is produced both a
a weather-proof casing 3 (see Fig. 33). An an
?rst flow of ?uid and a second flow of fluid. I
nular terminal and support plate 4 is supported
use the ?rst flow of ?uid to assist moving the
on the casing 3 and supports a housing 5, only a
established arc laterally, and arrange the sec 40 portion of which is shown. A line terminal 8 is
0nd ?ow of ?uid to contact the are after it has
connected to the support plate 4.
moved laterally to effect its extinction.
Insulating tie rods 1 support the arc extin
Another object is to provide an improved cir
guishing units within the casing 3, and insulat
cuit interrupter in which is produced a ?ow of
ing spacing sleeves8 maintain the arc extin
?uid. I establish an are not in the ?ow of ?uid
guishing units in spaced relation with respect to
and move it laterally into the ?ow to effect its
each other and also with respect to the terminal
extinction.
and support plate 4. Nuts 9 are utilized to se
A more speci?c object of my invention is to
cure the tie rods 1 to the support plate 4 and also
provide an improved circuit interrupter in which
to maintain the insulating plates forming the arc
an arc is established, and to provide means for
' extinguishing units in a compressedrelation.
moving the arc laterally during relatively low in
stantaneous values of arcing current. I also pro
vide means for driving fluid into the are after it
has been moved laterally to effect its extinction.
Further objects and advantages will readily
Referring to Fig. 1, the top insulating plate ID
of each arc extinguishing unit 2 is shown more
clearly in Figs. 5 and 6. It will be observed that
circular apertures it are provided. in the plate
I0 to accommodate the tie rods 1, A circular
2,403,103
3
4
vent aperture I2 is provided, the purpose of which
will appear more clearly hereinafter. A rectan
lating plate 42 has disposed therein a plurality,
in this instance four, pockets 45. A barrier por
gular vent aperture I3 is provided, and circular
piston guide apertures l4 are provided, the pur
tion 46 is provided between the elongated slot
43 and the circular vent aperture 12, as shown
in Fig. 13. Immediately below the insulating
plate 42 is an insulating inlet plate, the con?g
pose for which will also appear more clearly here
inalter.
An oval-shaped aperture I5 is formed in the
plate HI,‘ and a stationary contact aperture i6
is provided in the plate I0. Two tapped aper
tures I‘! are provided in the plate Ill adjacent
to the stationary contact aperture i6. A coil
connector aperture 18 is provided in the plate Hi.
Immediately below the insulating top plate H)
is an insulating magnet plate l9‘, more clearly
shown in Figs. 7 and 8. The insulating rnag~
net plate H! has circular apertures II for the tie
rods 1, a circular vent aperture l2, circular piston
guide apertures l4, a stationary contact aper
ture l6, and a cutout portion 2|) which accom
modates the insertion of the bight portion of a
U-shaped magnet 2| composed or magnetic ma
terial, in this instance iron, as more clearly shown
in Fig.4.
Below the magnet plate 19 is an insulating
coil plate, generally designated by the reference
numeral 22, the con?guration of which is more
clearly shown in Figs. 9 and 10. The coil plate
22 has apertures similar to those already de
scribed. The coil plate 22 comprises three insu~
uration of which is more clearly shown in Figs.
15 and 16. The insulating inlet plate 13'1" has a
passage generally designated by the reference
numeral 48 of irregular outline. The passage
48 has a relatively wide portion 43 and a rela~
tively restricted portion 53 which leads into a
less restricted section at 5|, the latter communi~
eating to the circular venting aperture l2, as
more clearly shown in Fig. 15. A plurality, in
this instance two, inlet passages 52 are provided
in the insulating plate 41 which lead from the
enlarged piston apertures 4| to the less restricted
section 5|, as more clearly shown in Fig. 15.
Below the insulating inlet plate is? is an insu
lating pocket plate 53, the configuration of which
is more clearly shown in Figs. 17 and 13. The
passage 48 in the insulating pocket plate 53, has
an irregular outline and has a widened portion 5:1
which leads into the pockets 45.
Then follows an insulating inlet plate 6], an
insulating pocket plate 53, an insulating inlet
plate 41 and an insulating pocket plate 53. Below
the last insulating pocket plate 53 is an insulat
lating parts, two of which are indicated by the 30 ing arc horn plate 55, the con?guration of which
is more clearly shown in Figs. 19 and, 20. The in
reference numeral 23 and the other by the ref
sulating arc horn plate
has a slot 555 formed
erence numeral 24. which are more clearly. shown
therein to accommodate the insertion of the lower
in Figs. 9 and 10. The space 25, between the
insulating parts 23, 24 is used to accommodate
arcing. horn 57. A beveled aperture 53 accommo
the insertion of coils 26, 21 (see Fig. 4) . A con
dates a lower arcing horn screw till, as more clear
ly shown in‘ Fig. 1,. A beveled aperture 59 pro
motor‘ 28 which electrically connects, the coils
vided in‘ the insulating arc horn plate 55 accom
26, 21 is disposed in a slot 29 provided in the
modates, a lower arc horn screw 8|, as shown in
coil plate 22.
Fig. 1.
A coil connector stud 30 passes through the
Below the insulating arc horn plate 55 is an in
coil connector apertures |8 provided in plate 40
sulating coil plate, generally designated by the
I0 and partly in coil plate 22, also passing through
reference. numeral 82‘, and shown more clearly in
an aperture 3| provided in the bight portion of
Figs. 21 and 22. The insulating coil plate 62 com
the U-shaped magnet 2| as more clearly shown
prises two insulating parts 63 and a surrounding
in Fig. 1. A connector 32 electrically connects
insulating part
as more clearly shown in Fig.
the coil connector stud 30 with coil 21, the con
21. The space 25 between the parts 63 and the
nector 32 being disposed in a slot 33 provided in
[part 64 is used to accommodate the insertion of
the coil plate 22, as shown in Fig. 9.
coils (i5, 66, more clearly shown in Fig. 11.
A connector 34 disposed in a slot 35 provided
A connector El electrically connects the coils
in the coil plate 22 is connected at one end to 50
the coil 26 and at its other end to an arcing
horn screw 36, as more clearly shown in. Fig. 1.
Immediately below the coil plate 22 is an insulat
ing plate 31, more clearly shown in Figs. 11 and
65, 56 in series and is disposed in a slot 68 pro
vided in the insulating coil plate 62. A connector
69; (see Fig. l) secured, as by welding‘, to thelower
arc horn screw 6|’ lies in a slot “iii disposed in the
12. The plate 31 has apertures similar to those 65 insulating coil plate 62 and electrically connects
the coil 65 with the lower arc horn iii. A con
previously described and which are designated. by
nector l2 lying in a slot 1'3 provided in the in
the same reference numerals. In addition, the
sulating ecoil plate 52 electrically connects coil
plate 31' has a beveled aperture 38 for the arcing
66 with stud 14, as more clearly shown in Fig. 1.
horn screwv 36. Another beveled aperture 39 is
The insulating coil plate 82 has disposed there
provided in the plate 31 to accommodate the
60 in a circular aperture 75, the purpose for which
other arcing horn screw 40, as shown in Fig. 1.
will appear more clearly hereinafter. Below the
The insulating plate 31 has two enlarged piston
insulating coil plate 62- is an insulating magnet
apertures 4| which are larger in diameter than
plate ll, the con?guration oi which isrnore clear
the circular piston guide apertures | 4 provided
ly shown in Figs. 23 and 24. An aperture '18 is
in plates l0, I9, and 22, the purpose for which
provided in the magnet plate TI to accommodate
will appear more clearly hereinafter.
the stud 14. A cutout portion 29 is also provided
Below the insulating plate 31 is an insulating
in the insulating magnet plate TI to accommodate
plate 42, the con?guration of which is more clear
the insertion of a U-shaped magnet 2| composed
ly shown in Figs. 13 and 14. The plate 42 has
disposed therein an elongated slot 43 which is 70 of magnetic material, in this instance iron, as
shown more clearly in Fig. 4.
provided to accommodate the insertion of an
The bottom insulating plate 19 of the are ex
upper arcing horn 44,, as more clearly shown in
tinguishing unit 2 has a con?guration more clear
Fig. 1. The arcing horn 44 has a grating por
ly shown in Figs. 25 and ‘26,. The insulating plate
tion 44a (see Fig. 2), the purpose for which will
also appear more clearly hereinafter. The insu 75 15. has apertures similar to those previously de
2,403,103.
5
scribed and are designated by the same reference
6
contact carrying member downwardly as viewed
numerals.
.
in Fig. 1. Astationary contact I02 is provided.
When the insulating plates are all aligned on
Preferably the stationary contact I02 is inte
the insulating tie rods ‘I and compressed by the
grally formed with the contact carrying member
nuts 9, the several apertures align to form elon
99 and extends through the stationary contact
gated passages. More particularly, the enlarged
apertures I6 provided in insulating plates I0, I9,
piston apertures 4I align to form piston cham—
22, and 31.
bers, generally designated by the reference nu
In the closed circuit position of the interrupter,
meral 80, and as more clearly shown in Fig. 4.
not shown, the electrical circuit therethrough
Referring to Figs. 1 and 4, it will be observed 10 comprises (see Fig. 33) line terminals 6, annular
that I have provided two insulating second pis
terminal and support plate 4, ?exible conductor
tons 8i collectively constituting a. second ?uid
I03, ?exible conductor I04 (see Fig, 2), bolt I05,
moving means which are operative into the pis
stationary contact I02, movable contact 94, me
ton chambers 80 to compress the ?uid, in this in
tallic coupling member 95, ?exible conductor I06,
stance oil, disposed in the piston chambers 80. 15 bolt I95, to the contact carrying member 99 of
The insulating pistons 8| are supported at their
the lower are extinguishing unit 2 shown in Fig.
upper ends to a triangular-shaped insulating sup
l. The circuit then extends through the lower
port plate 82, more clearly shown in Figs. 27 and
arc extinguishing unit 2 of Fig. 1 in the same
28. The support plate 82 has piston apertures
manner as it extended through the upper arc
93 formed therein which serve to support the in 20 extinguishing unit 2 of Fig. l. The metallic cou
sulating pistons BI, nuts 84 being utilized to se
pling member I01 of the lower arc extinguishing
cure the upper portion of the insulating pistons,
unit 2 (see Fig. 33) supports two disconnect ?n
which are preferably threaded, to the insulating
gers I08 which are engaged by a conducting ac~
support plate 82. Also secured to the insulating
tuating member, not shown. The conducting ac
support plate 82 is an insulating operating rod 85, 25 tuating member may be electrically connected
more clearly shown in Fig. 1. The insulating sup
to the other terminal of the interrupter by a
port plate 82 has an operating rod aperture 89
sliding connection, not shown.
formed therein in which the insulating operating
The opening operation of the interrupter
rod 85 is secured by the nuts 81, as more clearly
shown in Fig. 1 will now be explained. When it
shown in Fig. 1.
30 is desired to open the electrical circuit passing
The insulating support plate 82 has notches 88
through the interrupter, or when overload con
formed therein to accommodate the insulating tie
ditions exist in the electrical circuit controlled
rods '1 and the sleeves 8 surrounding the tie rods 1.
by the interrupter, suitable operating means, not
Also secured to the insulating support plate 8.2
shown, but which may be of the form shown in
is ‘an insulating piston member 89 more clearly 35 Patent 2,138,382 are actuated to permit down
shown in Fig. 1. The support plate 82 has a pis
ward movement of the metallic coupling member
ton aperture 90 formed therein through which is
it? of the lower arc extinguishing unit 2 of Fig.
inserted the upper end of the insulating piston
1 (see Fig. 33). The metallic coupling member
member 99. Nuts 9I may secure the piston mem
I01 and the two piston members 89 of both units
ber 89 to the insulating support plate 82, as shown 40 2 in Fig. 1 move downwardly as a unit, suitable
in Fig. 1.
spring means being provided within the housing
The ?rst ?uid moving means or ?rst insulating
5 of Fig. 33, not shown, to bias the insulating
piston member 89 supports a plurality of oval
operating rod 85 downwardly. As the insulating
shaped insulating washers 92, 93 as more clearly
operating rod 85 and the two insulating support
shown in Fig. 1. The oval-shaped washers 92 45 plates 92 of both units 2 move downwardly to
have an external dimension that is greater than
gether as a unit, the movable contacts 94 sepa
the external dimension of the oval-shaped insu
rate from the stationary contacts I02 to draw an
lating washers 93. Consequently the surface of
arc, the upper end of which is readily transferred
the insulating piston member 89 is corrugated as
to the upper arcing horn 44.
50
shown in Fig. 1.
It will be observed that the downward motion
The ?rst piston member 89 moves through the
of the insulating ?rst piston member 89 will pro
oval-shaped apertures vI5 provided in plates I0,
duce through piston action an upward flow of
I9, 22, 3?, 42, 41, 53, and 55.
fluid, in this instance oil, upward in the enlarged
A movable contact 94. having a con?guration
portion 49 of the arcing passage 48 to vent
more clearly shown in Figs. 1 and 3, is secured to 55 through the grating 44a of the upper arcing horn
the insulating piston member 89. Below the mov
44 and out of the unit 2 through the rectangular
able contact 94 is a metallic coupling member 95
vent apertures I3 provided in insulating plates
making a press ?t at 96 with the insulating piston
!0, I9, 22, and 31. This upward ?ow of ?uid is
member 89. Nuts 97 rigidly secure the metallic
indicated by the arrows in Fig. 1. The volume
coupling member 95 to the insulating support 60 of the ?rst piston member 89 entering the en
plate 82 of the lower arc extinguishing unit 2 of
larged portion 49 of the arcing passage 48 is
Fig. 1. Threadedly secured to the metallic cou
greater than the volume of the metallic coupling
pling member 95 is a spanner nut 98 which clamps
member 95 which is leaving the enlarged por~
a flexible conductor I06 to the piston member 89
tion 49 of the arcing passage 48. Consequently,
85 a displacement of fluid within the enlarged. por
of the lower arc extinguishing unit 2.
Extending transversely across the top of the
tion 49 results, and this fluid is displaced up
upper arc extinguishing unit 2, as more clearly
wardly in the direction shown by the arrows in
shown in Fig. 2, is a contact carrying member 99
Fig. 1 through the arcing horn 44 and out of the
having two spaced bolts I00 passing there
unit 2 as previously described. This venting of
through,‘ which spaced bolts I00 are supported 70 the ?uid upward. and through the rectangular
in the two tapped apertures I‘! provided in the
vent passages I3 helps to transfer the upper ter
top insulating plate I0. Compression springs IIJI
minal of the arc to the upper arcing horn 44,
surrounding the spaced bolts I00 and disposed
The electrical circuit now through the inter~
between the heads of the two bolts I00 and the
rupter comprises line terminal ‘6 (see Fig. 33),
contact carrying member 99 serve to bias the 75 support plate 4, connector I03, coil connector '
2,403,103
7
8
stud 3.0, connector 32, coil 21, connector 28, coil
4 (see Fig. 33), connector Hi3, coil connector stud
26, connector 34, arcing horn screw 36, upper arc
ing horn 44, the arc itself (not designated), mov
3B, connector 32, coil 22', connector 28, coil 25,
connector 34, arcing horn screw 35, upper arcing
horn 44, are ill], lower arcing horn 51, lower arc
able contact 94, metallic coupling member 95,
?exible conductor I06, bolt [05, ?exible conduc (-1 horn screw 6|, connector 89, coil 65, connector 51,
coil 66, connector 12, stud l4, ?exible connector
tor I!!! (see Fig. 1), lower coil connector stud
ill, ?exible conductor I63, coil connector stud
30 through the upper series coils 21, 2B of the
30 of the lower arc extinguishing unit 2 of Fig. 1,
lower arc extinguishing unit 2 through the arc,
through the lower arc extinguishing unit 2 in
not shown in the lower arc extinguishing unit 2,
movable contact 94 of the lower unit 2, metallic 10 a similar manner as through the upper unit 2
to the ?exible conductor l i2 (see Fig. 33) , discon
coupling member It‘! (see Fig. 33), disconnect
lingers I03, conducting actuating member, not
shown, to the other terminal of the interrupterv
It will, therefore, be apparent that the trans
ncct ?ngers Hi8, conducting actuating member,
not shown, to the other line terminal of the in
terrupter.
It will be observed that while the are H0 is
positioned within the less restricted portion 5|
arcing horn 44 cuts into series circuit the two
of the arcing passage 48, it is subjected to a blast
series coils 26, 2l' of each arc extinguishing unit 2.
of ?uid, in this instance oil, through the inlet
These coils produce a magnetic ?eld perpendicu»
passages 52 provided in the insulating inlet plates
lar to the plane of the drawing of Fig. 1. Assumm
ing that the instantaneous current through the 20 41 caused by the piston action of the insulating
second pistons 8i. it will be observed that the
interrupter is in a downward direction, the magpiston chambers 81) are considerably larger in
netic ?eld thus provided is in a direction com
diameter than the insulating pistons 3 l , and, con
ing outwards toward the reader perpendicular
sequently, ?uid pressure is maintained through
to the plane of Fig, 1. This magnetic iield acts to
bias the arc in a leftward direction, as viewed 25 all of the inlet passages 52 at the same time.
This feature is very important in the function
in Fig. 1, and tends to force the are from the
ing of the insulating pistons 8| , that is, the main
widened portion 49 of the arcing passage 48
taining of the fluid in all of the inlet passages 52
through the restricted portion 50 and into the
under pressure. rI‘he fluid passing through the
less restricted portion 5|., as more clearly shown
in Fig. 3.
30 inlet passages 52 into the less restricted portion
51 of arcing passage 48 and toward the venting
During relatively large instantaneous values of
passage, generally designated by the reference
arcing current the cross-section of the arc is too
numeral H3 in Figs. 1 and 3, causes a blast of
large to permit it to enter the restricted portion
?uid to contact the are I I0 and to quickly deionize
50. It is only when the instantaneous value of
the same at the ?rst current zero and prevents its
arcing current is relatively small that the cross- reignition when the recovery voltage builds up.
sectional area of the arc stream is sufficiently
It will also be observed that the are ill], while
small for it to enter the restricted portion 50 of
in the less restricted portion 51 , has ample oppor
the arcing passage 48.
It is apparent that during the time that the
tunity to contact ?uid disposed in the pockets
arc is in the enlarged portion 49 the upward ?uid
d5 provided in the insulating plates 42 and 53.
flow, created by the piston action of the piston
Thus, it is apparent that a. large quantity of fluid
disposed within the pockets 45 is available to
member or ?rst fluid moving means 89, will serve
to wash gas and contaminated fluid out of the
send a blast of un~ionized gas and oil particles
units 2 through the upper arcing horns 44 and
into the are core Iii] to deionize the same. The
through lthe rectangular vent apertures l3. Con
barrier portions 46 disposed in insulating plates
sequently the dielectric strength within the arc
42 and 53 prevent the are Hi] from being swept
extinguishing units 2 is maintained at a, high
completely into the venting passage H3.
value while the arc is positioned in the widened
The direction of the fluid ?ow is indicated by
portion 49 of the arcing passage 48. Also, the
the arrows in Figs. 1, 3, and 4,
provision of the venting means, generally desig 50.
After the arc HE] has been extinguished and
nated by the reference numeral H4, in Fig. .l,
the movable contacts 94 are at their full open
prevents the internal pressure within the units
circuit position, as shown in
1, the conducting
2 from attaining too great a value.
actuating member, not shown (see Fig. 33), sepa
As mentioned previously, during relatively low
rates from the disconnect ?ngers I53 to introduce
instantaneous values of arcing current, the cross
an isolating gap into the circuit.
fer of the upper terminal of the arc to the upper
sectional area of the arc is su?iciently small to
During the closing operation, the conducting
permit the somewhat diagonal ?uid ?ow caused
by the piston action of the first ?uid moving
means or ?rst piston 69, and coupled with the
actuating member, not shown, moves upwardly to
engage the disconnect ?ngers Hill and to move
the metallic coupling member ID‘! and the two
biasing action exerted by the magnetic field with 60 piston members 89 disposed in the two units 2
in the units 2, to force the are to the left, as
upwardly as a unit against the biasing action of
viewed in Fig. 1, through the restricted portion
the springs, not shown, disposed in the upper
50 of the arcing passage 48, and into the less re
housing 5 (see Fig. 33). This upward movement
stricted portion 5|.
continues until the movable contacts 94 engage
When the arc is in the less restricted portion
the stationary contacts Hit, the compression
5| it is rapidly forced to the left by the fluid ?ow
springs l0! furnishing the requisite contact pres—
in the portion 5| provided in the insulating inlet
sure between the movable contacts 94 and the
plates 41, which portion communicates with the
stationary contacts I02.
circular vent aperture l2. The rapid movement
It will be readily apparent from the foregoing
to the left of the are into the less restricted por 70 description that I have provided piston means for
blasting fluid at the arc H0 after it has been
tion 5| transfers the lower terminal of the are
moved laterally by the magnetic ?eld through the
from the movable contact 94 over to the lower
restricted portion 50 of the arcing passage 48.
arcing horn 51.
It is also apparent that the fluid ?ow through the
The electrical circuit now through the inter
' rupter is as follows: line terminal 6, support plate 75 inlet passages 52 does not strike the are I 10 until
2,403,103
the current through the arc III] has a relatively
low instantaneous value. Consequently, the pis
ton is not operative to blast the arc during rela
tively high instantaneous values of arcing current
when the are I I i! is positioned in the widened por
tion 49 of the arcing passage 43, but only strikes
the arc I I3 after the latter has passed through the
restricted portion 59, and at a time when the in
stantaneous current is small and when conditions
are right for arc extinction.
The ?ux lines I59 in Fig. 4 indicate schemati—
cally the direction of the magnetic ?eld in the
arc extinguishing units 2 when the current
10
Within the arc extinguishing unit II 9, and
preferably intermediate the ends thereof, is an
intensifying magnet structure, generally designat
ed by the reference numeral‘ I43. The intensi
fying magnet structure I43 comprises a laminat
ed core I44 around which is wound a magnetiz
ing coil I45. Arcing horns I46, I47 are provided
and are electrically connected to the magnetiz
ing coil I45 through the terminals I43, I49, as
10 shown more clearly in Fig. 29.
The right-hand ends of the arcing horns I46,
I41, as viewed in Fig. 29, are forked, as at I 59
(see Fig. 31) so that the vertical ?ow of ?uid
through the arc III) is in a downward direction.
within the enlarged portion 49 of the arcing pas"
In the embodiment of my invention shown in
sage 43 will not be impeded. The vertical direc
Figs. 29 through 33, inclusive, the reference nu
tion of ?ow is indicated by the arrows in Fig. 29.
meral II ‘I designates a stationary contact, the
Adjacent the arcing horn I46 are upper pole
lower end of which is disposed through a top
pieces I5I which are a part of the magnetic cir
metallic plate I20 and into a modi?ed type of arc
cuit through the laminated core I44. Also ad
extinguishing unit, generally designated by the 20 jacent the lower arcing horn I41 are lower pole
reference numeral H9. The are extinguishing
pieces I52 which also are a part of the magnetic
assemblage, generally designated by the reference
circuit passing through the laminated core I44,
numeral IE3, is analogous to the arc extinguish~
as shown more clearly in Fig. 32.
ing assemblage I of Fig. 1.
In the closed circuit position of the interrupter,
Extending through the top metallic plate I29
are two brackets I2I composed of magnetic ma
the electrical circuit therethrough comprises line
terminal 6, conducting support plate 4, conductor
terial, in this instance iron. At the lower end
I 93, series magnetizing coil I 25, ?exible conductor
of each bracket I2I and disposed within the unit
I21, lug I34, stationary contact “1, movable con
H9 is a pole piece I22, more clearly shown in
tact
94, metallic coupling member 95, ?exible con
Fig. 32. Disposed between the pole pieces I22 is 30 ductor I53, terminal gonductor I54 of magnetiz
an upper arcing horn I23 having a grating por
ing coil I26 of lower arc extinguishing unit H9,
tion I23a, as more clearly shown in Fig. 30.
?exible conductor I21, lug I34, stationary con
Screws I24 secure the upper arcing horn I23 to
tact I I1 of lower arc extinguishing unit I I 9, mov~
the top metallic plate I23.
able contact 94 of lower unit H9 (not shown)
A laminated core I25 is secured to the upper 35 to metallic coupling member I 91 (see Fig. 33),
ends of the brackets IZI, as shown in Fig. 32.
disconnect ?ngers I08, conducting actuating
Around the laminated core I25 is wound a series
member, not shown, to the other line terminal
ngagnetizing
coil I26, more clearly shown in Fig.
3 .
of the interrupter.
The opening operation of the interrupter which
is shown in Figs. 29 to 33, inclusive, will now be
A plate member I28 (see Fig. 30) has two 01T 40
standing integral lever arms I 29 which are pivot
described. When it is desired to open the elec~
ally mounted at I33 to the core I25, as more
trica'l circuit through the interrupter or when
clearly shown in Figs. 30 and 32.
overload conditions exist in the electrical circuit
An insulating bracket I3I secured at its left
controlled by the interrupter, suitable operating
hand end, as viewed in Fig. 29, to the tie rods 45 mechanism, not shown, moves the conducting ac
‘I, has a stud I32 slidable therethrough. The
tuating member, not shown, downwardly to permit
lower end of the stud I32 passes through a lug
the metallic coupling member IU'I. (see Fig. 33) to
I34, the plate member I28 and is threadedly'se
move downwardly under the biasing action of the
cured to the stationary contact I H. A compres
compression springs disposed in the housing 3
sion spring I33 encircles the stud I32 and is dis 50 (not shown). As in the previously described ‘em
posed between the insulating bracket I3! and the
bodiment of my invention, the metallic coupling
lug I34 as shown in Fig. 29. It will. therefore, be
member I01 and the two piston members 89 in
apparent that the compression spring I33 biases
both are extinguishing units H9 move down
the stationary contact II‘! in a downward direc
wardly as a unit, separating the movable con
tion, as viewed in Fig. 29. The ?exible conductor 55 tacts 94 from the stationary contacts I". As in
I21 terminates at its right-hand end in the lug
the previous modi?cation of my invention, the
I34.
upper terminal of the arcs consequently drawn
At the lower end of the arc extinguishing unit
are transferred to the upper arcing horns I23
II9 are disposed two brackets I35 composed of
by the upward ?ow of ?uid out through the vent
magnetic material, in this instance iron. At the 60 passages II4 (see Fig. 29).
upper ends of the brackets I35 and extending
The top metallic plate I23 serves as an electrical
toward each other are pole pieces I35, prefer
connector between the stationary contact I I1 and
ably integrally formed with the brackets I35. Be
the upper arcing horn I23. The electrical circuit
tween the pole pieces I36 is disposed a lower arc
now through the interrupter is the same as that
ing horn I 31, as more clearly shown in Fig. 32. 65 previously described with the exception that arcs
A screw I38 secures the lower arcing horn I31. to
are interposed between the movable contacts 34
the bottom insulating plate I48. A bolt I39 se
and the upper arcing horns I23. As the piston
cures the lower arcing horn I3‘! to the bottom
members 89 move downwardly the lower terminal
insulating plate I 40 and also serves to bring an
of the arc is transferred to the arcing horn I43
electrical connection from the lower arcing horn 70 (see Fig. 29). The reference numeral I55 desig
I31 out of the arc extinguishing unit II 9. Dis
nates the are which is thus transferred to the
posed between the brackets I35 is a laminated
arcing horns I23, I 46. As the movable contacts
core I M, more clearly shown in Fig. 32. Around
94 move downwardly past the arcing horns I41,
the laminated core I III is wound a magnetizing
a terminal of the arc transfers to the arcing horn
coil I42.
I4‘! to cut the magnetizing coil I45 intogseries
2,403,103
11
circuit. The cutting of the magnetizing coil I45
1
12
i. In a circuit interrupter, an elongated arcine
into series circuit creates a magnetic "?eld within
the interior of the arc ‘extinguishing unit II'i-l, as
designated
32.
by the reference numeral I59 in
When the movable contacts 94 approach the
ing an arc in the wide porti
creating a magnetic ?eld to bias. the are into the
restricted portion, one or more inlet passages posi
tioned laterally along the walls of the restricted
portion leading into the restricted portion oi the
elongated arcing passage, and means operative to
caused by the reaction ‘of the magnetic ‘?eld set 10 force ?uid through the inlit
into the
up by the magnetizing coil ‘I45 in the arc extin
restricted portion to strike t. e are after the arc
guishing units H9. The reference numeral I55
has entered the restricted portion to assist in its
designates the position of the are after the lower
extinction.
terminal thereof has transferred to the lower
2. In a circuit interrupter, an elongated arcing
arcing horn I3‘I. This transfer cuts in the mat;
passage having a relatively wide portion and a
netizing coil I42 disposed at the lower end of the
relatively restricted portion, means for establish
arc extinguishing units H9.
ing an arc in the wide portion, coil means for
The electrical circuit now through the inter
creating a magnetic field to bias the are into the
rupter comprises line terminal 6, conducting sup
restricted portion to effect its extinction therein,
end of their travel, the lower terminal of the arc
transfers from the movable contacts 334 to the
lower arcing horn I31. This transfer is largely
port plate 4, conductor I03, series magnetizing 20 the restricted portion being so narrow that the
coil I26, ?exible conductor vI21, lug I34, stationary
arc enters the restricted portion only during rela
contact II‘I, top metallic plate I20, upper arcing
tively low instantaneous values of arcing current.
horn I23, are I55, arcing horn ME, terminal £48,
one or more inlet passages positioned laterally
magnetizing coil I45, terminal hi3, arcing horn
along the walls of the restricted portion leading
I41, arc I55, lower arcing horn I37, bolt I33, ter» 25 into the restricted portion oi~ the elongated arcing
minal I51 of magnetizing coil I42, magnetizing
passage, and means operative to force ?uid
coil I42, ?exible conductor I53, terminal I54 of
lower magnetizing coil I26 through the lower arc
through
extinguishing
the upper
unit H9
unitinIIB
an to
identical
?exible manner
conductor
through the inlet passages into the restricted por
tion to strike the are after the arc has entered
the restricted portion to assist in its extinction.
3. In
circuit interrupter, means for estab
II2, disconnect ?ngers I08, conducting actuating
lishing an arc, means for moving the arc laterally
member, not shown, to the other line terminal of
only during relatively low instantaneous values of
the interrupter.
The deionizing action and the operation of the
arcing current, and piston means for directing a
plurality of jets of ?uid at the are on opposite
piston members III are identical to that described 35 sides thereof at a plurality of spaced points along
previously in connection with the interrupter
the length of the are after it has been moved
shown in Fig. 1. Therefore, a further description
laterally to effect its extinction.
seems unnecessary. It will, however, be observed
that by providing the intensifying magnet struc
a. In a circuit interrupter, an elongated arcing
passage having a relatively wide portion and a
ture I43 which is cut into series circuit by the are, 40 relatively restricted portion, means for establish
a means has been provided to intensify the mag
ing an arc in the wide portion, means ‘for moving
netic ?eld within the arc extinguishing units I I9,
the arc laterally into the restricted portion, at
and hence to more strongly bias the arc to the
least one ?uid inlet passage positioned laterally
left, as viewed in Fig. 29, and through the re“
on one wall of the restricted portion leading into
stricted portion 50 of arcing passage 48. After the @ the restricted portion of the elongated arcing pa~~~
arcs have been extinguished, the actuating mern~
sage, and means for forcing ?uid through the
ber, not shown, separates from the disconnect
inlet passage into the restricted portion to blast
?ngers I08 to introduce an isolating gap into the
the are portion.
stricted
after it has moved laterally into the
circuit.
Although I have utilized oil as an arc extin»
guishing ?uid, it is to be clearly understood that
my invention is applicable to the use of other are
extinguishing ?uids, for instance, gases or even
air. In the latter event the several insulating
plates making up the arc extinguishing units 2,
H9, may be composed of horn ?ber which will
evolve an arc extinguishing gas upon being con
tacted by an arc. The term “?uid” as used herein
and in the appended claims comprises liquids,
gases, vapors, and sprays,
Instead of using pistons 8| to produce the pres
sure within the piston chambers 80 to cause the
5. In a circuit interrupter, an elongated arcing
passage having a relatively wide portion and a
relatively restricted portion, means for establishing an. arc in the wide portion, means for moving
the arc laterally into the restricted portion, a
plurality of ?uid inlet passages positioned later»
ally on one wall of the restricted portion leading
into the restricted portion of the elongated arcing
passage, and means for forcing ?uid through the
inlet passages into the restricted portion to blast
the arc after it has moved laterally into the re
stricted portion, the arc only moving laterally
into the restricted portion during relatively low
?uid ?ow through the inlet passages 52, I may
instantaneous values of arcing current.
6. In a circuit interrupter, an elongated arcing
the requisite pressure. It is to be clearly under
passage having a relatively wide portion and a
stood that my invention is not to be limited to the
relatively restricted portion, means for establish»
use of piston means, but includes any other suit
ing an arc in the wide portion, means {or moving
able pressure generating means.
the arc laterally into the restricted portion. 2:.
Although I have shown and described speci?c
least one ?uid inlet passage positioned laterally
structures, it is to be clearly understood that the 70 on one wall of the restricted portion leading into
use a series pressure generating arc to produce
same were merely for purposes of illustration and
the restricted portion of the elongated arcing
that changes and modifications may be made by
those skilled in the art without departing from
the spirit and scope of the invention.
passage, and piston means for forcing ?uid
through the inlet passage into the restricted por
tion to blast the are after it has moved laterally
I claim as my invention:
75 into the restricted portion.
13
2,403,103
14
-
7. In acircuit interrupter, means for establish
ing an arc, means de?ning a restricted slot into
which the arc is moved only during low instan
taneous values of arcing current, a piston cham
ber disposed in a lateral wall of the slot, a plurality
of ?uid inlet passages leading from the piston
independent ?uid inlet passages terminating col
lectively into two groups on opposite sides of the
chamber laterally into the slot, a piston movable
into the piston chamber, the piston having such
plurality of spaced points along its length after it
are at a place where the arc will be after it has
moved laterally, and means for forcing ?uid
through the ?uid inlet passages so as to strike the
are substantially on opposite sides thereof at a
has moved laterally to effect its extinction.
a small volume as compared with the piston
14. In a circuit interrupter, means for estab
chamber that pressure is maintained through all 10 lishing an arc, ‘means for moving the arc laterally
the inlet passages for forcing ?uid therethrough
to facilitate the extinction of the arc after the
arc has moved into the restricted slot.
8. In a circuit interrupter, means for establish
ing an arc, means for causing a ?rst ?ow of ?uid 15
substantially longitudinally of the arc, means
only during relatively low instantaneous values
of arcing current, means at least partly of in;
sulating material for forming a plurality of spaced
independent ?uid inlet passages terminating col
lectively into two groups on opposite sides of the
are at a. place where the arc will be after it has.
other than the arc for producing a second flow of
?uid, and means comprising the first ?ow of ?uid
for moving the arc laterally, the arc contacting
moved laterally, and piston means for forcing
?uid through the ?uid inlet passages so as to
strike the are substantially on opposite sides
the second ?ow of ?uid after having moved later 20 thereof at a plurality of spaced points along its
ally to facilitate its extinction.
length after it has moved laterally to effect its
9. In a circuit interrupter, an elongated arcing
extinction.
passage having a relatively wide portion and a
15. In a circuit interrupter, means for estab
relatively restricted portion, means for establish
lishing an arc, a ?rst ?uid moving means to bias
ing an arc in the relatively wide portion, means
the arc laterally, means restraining the lateral
for moving the arc laterally into the relatively
movement of the arc until only low instantaneous
restricted portion only during relatively low in
values of arcing current, and a second independ
stantaneous values of arcing current, and means
ent ?uid moving means to force ?uid at the are
for directing a plurality of jets of ?uid at the are
after it has moved laterally to eiIect its ex
on opposite sides thereof at a plurality of spaced 30 tinction.
points along the length of the are after it has been
16. In a circuit interrupter, means for estab
moved laterally into the relatively restricted por
lishing an arc, a ?rst ?uid moving means to bias
tion to effect its extinction.
the arc laterally, means restraining the lateral
10. In a circuit interrupter, an elongated arcing
movement of the arc until only low instantaneous
passage having a relatively wide portion and a
values of arcing current, and a second independ
relatively restricted portion, means for establish
ent ?uid moving means to force ?uid at the are
ing an arc in the relatively wide portion, means
at a plurality of spaced points along the length
for moving'the are laterally into the relatively
of the are after it has moved laterally to effect
restricted portion only during relatively low in
stantaneous values of arcing current, and piston
means for directing a plurality of jets of ?uid at
the are on opposite sides thereof at a plurality
of spaced points along the length of the are after
its extinction.
40
17. In a circuit interrupter, means for estab
lishing an arc, a ?rst piston means to bias the
arc laterally, means restraining the lateral move
ment of the arc until only low instantaneous
it has been moved laterally into the relatively
values of arcing current, and a second independ
45 ent piston means to force ?uid at the are after it
restricted portion to effect its extinction.
11. In a circuit interrupter, means for estab
has moved laterally to effect its extinction.
lishing an arc, means for moving the arc laterally
18. In a circuit interrupten'means for estab
only during relatively low instantaneous values
lishing an arc, a ?rst piston means to bias the arc
of arcing current, means at least partly of in
laterally, means restraining the lateral movement
sulating material for forming a plurality of spaced 50 of the arc until only low instantaneous values of
independent ?uid inlet passages terminating col
arcing current, and a second independent piston
lectively at a place where the arc will be after
means to force ?uid at the are at a plurality of
it has moved laterally, and means for forcing
spaced points along the length of the are after
?uid through the ?uid inlet passages so as to
it has moved laterally tov effect its extinction.
strike the are substantially along one side there
_ 19. In a circuit interrupter, an arc extinguish
of at a plurality of spaced points after it has
ing unit, means at least partly of insulating ma
moved laterally to facilitate its extinction.
terialdefining an elongated arcing passage hav
12. In a circuit interrupter, means for estab
lishing an arc, means for moving the are later
ing a relatively wide portion and a relatively re
stricted portion, means for establishing an arc in
ally only during relatively low instantaneous 60 the relatively wide portion, means for moving the
are into the relatively restricted portion, two
values of arcing current, means at least partly
of insulating material for forming a plurality
of spaced independent ?uid inlet passages ter
minating collectively at a place where the arc
will be after it has moved laterally, and piston
means for forcing ?uid through the ?uid inlet
passages so as to strike the are substantially along
one side thereof at a plurality of spaced points
after it has moved laterally to facilitate its ex
tinction.
‘
13. In a circuit interrupter, means for estab
lishing an are, means for moving the arc later
ally only during relatively low instantaneous val
ues of arcing current, means at least partly of in
sulating material for forming a plurality of spaced
piston chambers spaced on opposite sides of the
restricted portion, two piston members simul
taneously movable Within the two piston cham
bers, and at least one ?uid inlet passage leading
from each piston chamber into the restricted por
tion to blast ?uid laterally at the are after it has
entered the restricted portion.
20. In a circuit interrupter, an arc extinguish
70 ing unit, means at least partly of insulating ma
terial de?ning an elongated arcing passage hav
ing a relatively wide portion and a relatively re
stricted portion, means for establishing an arc
in the relatively wide portion, means for moving
the arc into the relatively restricted portion, two
h £403,103
15
piston Chambers spaced on opposite sides of the
restricted portion, two piston members simul
taneously movable within the two piston cham
bers, at least one ?uid inlet passage leading from
each piston chamber into the restricted portion
to blast ?uid laterally at the are after it has
16
24. In a circuit interrupter, means de?ning an
elongated arcing passage having a relatively
wide portion and a relatively restricted portion
leading to a less restricted portion, means for es
tablishing an arc in the wide portion, a first ?uid
moving means for biasing the arc laterally
entered the restricted portion, and the spacing
through the relatively restricted portion and into
stricted portion, a relatively stationary contact,
erally through the restricted portion.
the less restricted portion, at least one ?uid inlet
of the restricted portion being so narrow that the
passage positioned laterally on one wall of the
arc can‘ only move therein during relatively low
10 less restricted portion leading into the less re
instantaneous values of arcing current.
stricted portion of the elongated arcing passage,
21. In a circuit interrupter, an arc extinguish-'
and second ?uid moving means for forcing fluid
ing unit, means at least partly of insulating ma
through the inlet passage into the less restricted
terial de?ning an elongated arcing passage hav
portion to blast the are after it has moved lat
ing a relatively wide portion and a relatively re~
a ?rst piston member carrying a movable contact
and cooperable with the stationary Contact to
establish an arc in the relatively wide portion,
the first piston member moving ?uid to bias the
are into the relatively restricted portion, two pis~
ton chambers spaced on opposite sides of the re
stricted portion, two second piston members si
multaneously movable within the two piston
chambers, and at least one ?uid inlet passage
leading from each piston chamber into the re
stricted portion to blast ?uid laterally at the are
after it has entered the restricted portion.
22. In a circuit interrupter, an arc extinguish
ing unit, means at least partly of insulating ma
terial de?ning an elongated arcing passage hav
ing a relatively wide portion and a relatively re
25. In a circuit interrupter, an arc extinguish
ing unit, means de?ning an elongated arcing pas
sage, the arcing passage including a relatively
wide portion and a relatively restricted portion
leading to a less restricted portion, means de?n
ing venting means beyond the less restricted por
tion, a relatively stationary contact, a ?rst piston
member carrying a movable contact and coop
erable with the relatively stationary contact to
establish an are within the relatively wide por
tion of the arcing passage, two piston chambers
spaced on opposite sides of the less restricted
portion, two second piston members movable
within the piston chambers, a plurality of spaced
?uid inlet passages leading from each piston
30
chamber to the less restricted portion of the
stricted portion, a relatively stationary contact,
arcing passage, the second piston members being
a ?rst piston member carrying a movable con
operable to blast ?uid at the are on opposite sides
thereof from a plurality of spaced points along
its length after it has passed through the re
tact and cooperable with the stationary contact
to establish an arc in the relatively wide portion,
the ?rst piston member movingr fluid to bias the
are into the relatively restricted portion, two pis
stricted portion.
' 26. In a circuit‘ interrupter, an arc extinguish
ing unit, means de?ning an elongated arcing pas
sage, the arcing passage including a relatively
stricted portion, two second piston members si
multaneously movable within the two piston 40 wide portion and a relatively restricted portion
leading to a less restricted portion, means de?n
chambers, at least one ?uid inlet passage lead
ing venting means beyond the less restricted por
ing from each piston chamber into the restricted
tion, a relatively stationary contact, a ?rst piston
portion to blast ?uid laterally at the arc after
member carrying a, movable contact and cooper~
it has entered the restricted portion, and the
spacing of the restricted portion being so narrow ' able with the relatively stationary contact to
establish an are within the relatively wide portion
that the arc can only move therein during rela
of the arcing passage, two piston chambers spaced
tively low instantaneous values of arcing current
on opposite sides of the less restricted portion,
23. In a circuit interrupter, means de?ning an
two second piston members movable within the
elongated arcing passage having a relatively wide
piston chambers, a plurality of spaced fluid inlet
portion and a relatively restricted portion lead
passages leading from each piston chamber to
ing to a less restricted portion, means for es
the less restricted portion of the arcing passage,
tablishing an arc in the wide portion, means for
the second piston members being operable to
moving the arc laterally through the relatively
blast fluid at the are 'on opposite sides thereof
restricted portion ‘and into the less restricted por
from a plurality of spaced points along its length
tion“, at least one ?uid inlet passage positioned
after it has passed through the restricted portion
laterally on one wall of the less restricted por
and the spacing of the restricted portion being
tion leading into the less restricted portion of
such that the are may only enter through the
the elongated arcing passage, and means for
restricted portion during relatively low instan
forcing fluid through the inlet passage into the
taneous values of arcing current.
less restricted portion to blast the are after it
has moved laterally through the restricted por
WINTHROP M. LEEDS.
tion.
ton chambers spaced on opposite sides of the re
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