US2614191A

US2614191A - High-voltage breaker and recloser

Info

Publication number: US2614191A
Application number: US92662A
Authority: US
Inventors: Bertram C Rogers
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-05-11
Filing date: 1949-05-11
Publication date: 1952-10-14
Anticipated expiration: 1969-10-14

Description

1 2 B. c. ROGERS 2,614,191

HIGH-VOLTAGE BREAKER AND RECLOSER Filed May 11, 1949 2 SHEETSSHEET l INVENTOR. Ear/ram (Faye/1s.

Oct. 14, 1952 a. c. ROGERS 2,614,191

HIGH-VULTAGE BREAKER AND RECLOSER Filed May 11, 1949 2 SHEETS-SHEET 2 LINE LINE

1min- I INVENTOR. flew/ am C Faye/1s.

A TTOE/VEX Patented Oct. 14, 1952 UNITED STATES PATENT OFFICE Claims. 1

This invention relates to circuit breakers and more particularly to automatically reclosing circuit breakers for high voltage circuits.

The principal object of the invention is the provision of a high voltage circuit breaker and recloser which will operate to open and subsequently reclose a high voltage circuit line at such time as an excessiv current occurs thereon,

A further object of the inventionis the provision of a high voltage circuit breaker and recloser which may be simply and economically con: structed and which isparticularly adapted for the protection of the high voltage transformers.

A still further object of the invention is the provision of a highvoltage circuit" breaker and recloser which is entirely automatic in operation and which will operate to continuously open and reclose an overloaded high voltage circuit until such time as the overloaded condition is eliminated and without damage to the circuit breaker itself or'the transformer or other devices protected by its operation.

A still further object of the invention. is the provision of an automatic thermally controlled high voltage circuit breaker that will open without arcing upon being overloaded and reclose without arcing upon com-pletionof a predeten mined timing cycle and repeat the" opening and r'eclosing cycle as long as'the overload condition exists or until locked out by auxiliary locking means which can be incorporated in the construction.

A still further object of the invention is the provision of an automatic high voltage circuit breaker and reclosingcircuit incorporating thermal responsive means as a prime mover for the operating mechanism thereof, impedance areas; ingmeans in the high voltag circuit controlled and heat storing means for the thermal control cuits. and may be incorporated in high voltage transformers in the high side thereof for protecting the sameupon short-circuitsor overload-s.

The device may obviously be used in connection with the protection of other high voltage equipment and is capable of operating automatically and indefinitely without manual attention or resetting as it is designed to protect itself as well as the associated equipment in the high voltage circuit supervised.

The device is intended to be enclosed in an oil filled housing and may obviously be enclosed in the same housing as the coolant provided in high voltage transformers and the like.

With the foregoing and other objects in view which will appear as the description proceeds, the

invention resides in the combination and ar rangement of parts and in the details of con-'- s'tru'ction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.-

The invention is illustrated in the accompanying drawing, wherein:

Figure 1- is aside view of the circuit breaker and recloser.

Figure 2 is a cross sectional view or the circuit breaker and recloser.

Figure 3 is a front plan view of' the circuit:

breake and recloser. I I

Figure 4 is a top plan view of the circuit breaker and recloser,

Figure 5 is a symbolic view of the circuit breaker and recloser and electrical circuits in connection therewith in normal closed circuit position.

Figure 6 is a symbolic view of the circuitbreaker and recloser' and electrical circuits in connection therewith showing the first stage of operation of the device responsive to an overload.

Figure 7 is a symbolic view of the circuit breaker and recloser and electrical circuits in connection therewith showin the circuit opened.

By referring to the drawings and Figures 1 to 4 in particular it will be seen that a high voltage circuit breaker and recloser has been illustrated which comprises a mechanism preferably enclosed in ahousing I0 capable of retaining: cooling.

liquid such as oil so that the mechanism of the circuit breaker is immersed therein. Th mochanism itself includes an insulating frame H havingv a pair of spaced upwardly extending arms i2 and I3 and the arms. carry a pair of shafts l4 and [i5 j'ournaled therein for rotary movement. The 'innerends of the shafts M and l 5' are mov-jably engaged one upon the other and electrically connected one to the other by means of a flexible conducto l6.

Each of the shafts 4 and i5 extend outwardly beyond the sides of the arms l2 and I3 and each has a slot l1 and I8, respectively, which serve to position and retain the ends of a pair of spirally wound bimetallic conductors l9 and 20. The outermost ends of the spirally wound bimetallic conductors |9 and 20 are secured to pins 2| and 22, respectively, which are in turn engaged in the insulating frame The pins 2| and 22 serve to hold the ends of the spirally wound bimetallic conductors l9 and 20 in fixed position with respect to the insulating frame Each of the pins 2| and 22 has a

line terminal

23 and 24, respectively, formed thereon. Each of the shafts l4 and I5 has a

contact arm

25 and 25, respectively, secured thereto and extending outwardly therefrom on a plane above the center thereof as best shown in Figures 1 and 2 of the drawings. The arms 25 and '26 are formed of insulating material and have floating contacts 21 and 28, respectively, positioned on their outermost ends, as best shown in Figures 1 and 2 of the drawings. The contacts 21 and 28 are normally spaced with respect to the outermost ends of the

arms

25 and 25 by

coil springs

29 and 30, respectively.

The shafts l4 and I5 also pivotally support a pair of secondary arms 3| and 32, the outermost ends of which lie directly in under the outermost ends of the

arms

25 and 26. Floating

contacts

33 and 34 are positioned on the upper surfaces of the ends of the arms 3| and 32 for normal registry with the contacts 21 and 28 heretofore referred to. The

contacts

33 and 34 are spaced with respect to the arms 3| and 32 by coil springs 35 and 36. and 26 has a vertical opening inwardly from their outermost ends and each of the arms 3| and 32 has an

arcuate latch

31 and 38, respec-v tively, pivoted thereto as at 39 and 48. The

arcuate latches

31 and 38 extend upwardly from the arms 3| and 32 and pass through the vertical openings in

arms

25 and 28 and are notched along their inner surfaces so that they will register with latch pins 4| and 42 positionedin the

arms

25 and 26, respectively, and transversely of the openings therein through which the

arcuate latches

31 and 38 are positioned.

It will thus be seen that the arm 3| is held in fixed spaced relation with respect to the arm 25 by the latch member 31 engaged upon the pin 4| and thereby holdin the contacts 21 and 33 in engagement to complete an electrical circuit therethrough. The arcuate latch 38 holds the

arms

32 and 25 in spaced fixed position thereby positioning the

contact members

28 and 34 in engagement and closing a circuit therethrough. The

arcuate latches

31 and 38 are normally held in engagement with the pins 4| and 42 by a pair of coil springs 43 and 44 which are connected between the uppermost ends of the

arcuatelatches

31 and 38 and a pair of-vertical supports 45 and 46 which are secured to the rearmost portions of the arms 3| and 32, respectively. It

will thus be seen that any rotating motion im--,

parted to the shafts M or |5 by the spiral bimetallic conductors l9 or 20 will lift the

arms

25 and 26 and the arms 3| and 32 by reason of the connection of the

arcuate latches

31 and 38.

In order that the

arcuate latches

31 and 38 may be released upon predetermined movement of the

arms

25 and 26 and the arms 3| and 32 released from their. fixed spaced position with Each of the arms 25 respect thereto, a pair of

release pins

41 and 48 are positioned in the path of the

arcuate latches

31 and 38 and spaced with respect to the end thereof 30 and 60, respectively. Positioning of the

release pins

41 and 48 is adjustable as they are carried on

extensions

49 and 50 of disc-like members 5| and 52, each of which is pivotally positioned on the shaft l4 and |5 and is provided with a radial slot 53 and 54, respectively, through which

bolts

55 and 56 positioned through transverse openings in the arms l2 and I3 are engaged so that the

release pins

41 and 48 may be adjusted by loosening the

bolts

55 and 58 and rotating the disc-like members 5| and 52.

Still referring to Figures 1 and 2 of the drawings it will be seen that each of the upper ends of the

latches

31 and 38 is provided with a cam surface for slidable engagement with the

release pins

41 and 48 whereby the

latches

31 and 38 may be lifted so as to disengage the same fromthe latch pins 4| and 42 heretofore described. Such action frees the arms 3| and 32 from their latched engagement from the

arms

25 and 26 and permits the same to drop. Secondary latches are formed on each of the arms 25 and '26 and comprise

latch members

51 and 58 pivoted as at 59 and 60 to the

arms

25 and 26, respectively, and adapted to be releasably engaged upon secondary latch pins 6| and 62 which in turn are carried by the body members 5| and 52.

In Figures 3 and 4 of the drawings an interconnecting latch releasing arm 63 is arranged to release the secondary latch arm 51 upon the predetermined release of the secondary latch arm 58 as hereinafter described.

By referring now to Figures 5, 6 and 7 of the drawings symbolic illustrations of the high voltage circuit breaker and reclosed may be seen in connection with the wiring diagrams and showing the normal closed circuit and circuit opening action of the device.

In Figure 5 of the drawings the high voltage line supervised is indicated by the legend line and it will be observed that one side thereof is connected by means of a conductor Ll with the terminal 23 on the fixed end of the spirally wound bimetallic conductor I9, the current normally flowing through the terminal 23, the spirally wound bimetallic conductor l9 and the shaft H and through a conductor L2 to the contact 33 on the outermost end of the arm 3| which is normally in registry with the contact 21 on the outermost end of the arm 25. A conductor L3 connects the contact 21 with the terminal 24 on the fixed end of the spirally wound bimetallic conductor 20 and a conductor L4 connects the terminal 24 with the contact 28 on the outermost end of the arm 26. The contact 28 is normally closed with the contact 34 on the outer end of the arm 32 and a conductor L5 connects the contact 34 with the other side of the line. It will thus be seen that the normal flow of the current through the high voltage circuit breaker and recloser as shown in Figure 5'of the drawings is by way of the line L] the bimetallic conductor |9, the shaft l4, the conductor L2 and through the contacts 33 and 21, through the conductor L3 and L4, through the

contact points

28 and 34 and conductor L5 to complete the circuit. At such time as an overload 'Or short exists on the line supervised, the additional flow of current through the conductor IE! will heat the sameand cause the operation illustrated symbolically in Figure 6 of the drawings.

By referring to Figure 6 of the drawings it will be seen that the heating of the bimetallic, conductor l9 has caused the same to rotate theshaft l4 so-as to lift the arm 25 which in turn liftsthe arm 3 I; by reason ofthe arcuate latch 31; untilthe arm. 25 has moved through30atwhich time the latent! will strike the release pinfi'l; and release the:.arcuate-. latch 31 from'the latch, pin 4| and permit thearm 3! to drop-thereby breakingthe circuit between the contacts 33 and 21:.

It willbe obvious to those skilledin the artthat ordinary line fluctuations will not sufficiently heat the bimetallic conductor 19 to cause it to rotate the shaft M through the 30 of motion necessary. to: effect the unlatchingof the arcuate latch 31 and that the circuit breaker and recloser remains inoperative during, such ordinary; line, .fiuctuations, the arms 25 and 31- rising and fallingre sponsive to the thermal action of the spiral. bimetallic conductor [8 which is in the; normal circuit.

Whenthe hereinbefore, described releasing ac,-

tion does occur, as'responsiveto an overload orshort in the supervised line, the current; then,

flows through the conductor Li, the bimetallic element [9, the shaft i 4,=the connection [6, the shaft l5 and the bimetallic conductor 28 and from the bimetallic conductor 2.6,through the conductor L4, the contacts 28. and 34and the conductor L5. The current flowing through the spiral bimetallic conductor 20 will heat the same and cause the shaft l5 -to revolve andwhen the same has revolved-through 60 the end of. the arcuate latch 38 will strike the release;pin=48 and release the arm 3 2 which will then dr-opand open thecontacts 3l-& d:23 thl3l6by breakingthe circuit. This actionis illustratedin Figure; 7 f the drawings wherein both pairs of contacts 33-, and 21-.and34 and 28 are shown in open position.

In Figures 5, 6 and '7 of the drawings there are also shown schematic arrangements of the secondary arms and 58 together with the latch releasing arm 63. The

secondary arms

51 and 58 and latch releasing arm 63 function to first hold the

arms

25 and 26 in elevated relation and then simultaneously release the same so that the

contacts

23, 21, 24 and 28 will simultaneously reclose the circuit through the device. As heretofore explained, the secondary arm 5'! is adapted to latch on the secondary latch pin 6! when the arm 25 is moved 30 from normal horizontal position by the action of the spiral bimetallic conductor IS with the result that the arm 25 is held in elevated relation by the secondary latch pin 6!, as shown in Figure 6 of the drawings.

At such time as the arm 26 rises through 60, the secondary arm 58, and more particularly a raised outer end portion 64 thereof, engages a socket 65 formed in a right angle extension of the latch releasing arm 63. The other end of the right angle extension of the latch releasing arm 63 is pivoted as at 86 to the framework of the device and the free end is urged against the secondary arm 58 by a tensioning spring 51 which is adjustably connected to the frame of the device. Thus, at such time as the circuit breaker has operated to break the circuit, the cooling of the spiral bimetallic conductor 28 will tend to rotate the shaft i5 clockwise and at such time as sufficient energy is developed the secondary arm 58 will disengage the socket 65 by pulling outwardly therefrom, which action will elevate the latch releasing arm 63 and simultaneously lift the secondary arm 51 from its engagement with the secondary latch pin 6!. This action frees both the

arms

25 and 26 and permits them to drop and Simultaneously reclose the contacts 313., 217,54; and 28 and thus. re-est'ablish. the. circuit: in itsnormal path through the device.

. It will occur to those, skilled in the art that the. reclosing of the circuit controllingscontactssimultaneously avoids arcing which would otherwise occur if one of the pairs of contacts closediinade vance of the other. The operationof: the device is such that it. is particularly adaptable toadiustment asafor. timing. the cyclingaction, which'ade iustment is made by, varying the winding ofthe spiral bimetallic conductors. i9; and; 20: with relation to their; attachment. to. theendsof the shafts; Hand; I15, respectively.v It willthus be seen that, in. operation theihigh voltage; circuit. breaker: andyrecloser operateson a definite. predeterminedv cyclefand' provides. for varying line, load conditions andxcurrentfluct'uae tionswhich. would ordinarily tend to cause. the. circuitbreaker and recloser to.operate.-.

In the. present device: the; ordinary andpenmissible variations are. anticipated. by. the: cone structiorr and. operation 'of' thedevice .as; .or example the operation of. the spiralbimetallic conductor is whichis always-in circ.uit;with-.the line and heating of; which. will: lift: the arms; 25 and 3L. This action. does. not. start. the cycle of operation of, the circuitbreaker andxrecloser until such time as. a. predetermined movement of the bimetallic conductor 19 moves the-arms:25 and 33; through 30? from normal; horizontal. position. Once this movement occurs; and. attains the 30 elevation from normal, the; arm. 25..is,

lifted in elevated position by the secondary-arm r 51 and the arm 3| is unlatched and dropped-to cause the current to travel. through the .spiral bimetallic conductor 28', heat. the same. and eleivate the arm; 26 to I at'which point .the. arm 32 is released and the circuit broken.

The reclosing cycle of the device is controlled by the time it takes the spiral bimetallic conductor 20 to cool sufliciently to overcome the tension of the adjustment spring 81 and disengage the secondary arm 58 from its latched position. Upon such occurrence, both the

secondary arms

51 and 58 are unlatched and the

arms

25 and 26 are free to reclose the circuit controlling contacts.

It will thus be seen that an action novel in the art of circuit breakers and reclosers has been incorporated in the device disclosed herein in that the actual opening of the circuit is performed by mechanical means (the spiral bimetallic conductor 20) which is, in effect, shunted into the circuit upon the opening of the contact arms controlled by the bimetallic conductor [9. Both of the spiral bimetallic conductors produce energy from the thermal action of the current flowing therethrough and the spiral bimetallic conductor 20, in addition to serving as a prime mover, creates desirable impedance in the circuit immediately prior to the opening of the circuit to the end that arcing is very substantially reduced if not eliminated.

It will be obvious to those skilled in the art that the device is adaptable to the automatic control of relatively high voltages by merely increasing the proportionate size and length of the various component parts to the end that their normal closed circuit and operating cycle open circuit positions are sufficient to avoid arcing between the several current carrying parts. It will also occur to those skilled in the art that if desired an arcing point may be added to the construction of the

contacts

21, 33, 28 and 34,

although the same are apparently not necessary at voltages up to and including 2400 volts.

It will thus be seen that the high voltage breaker and recloser disclosed herein meets the several objects of the invention.

- Having thus described my invention, what I claim is: I

1. A circuit breaker and recloser having two pairs of series connected separable contacts, a pair of latch mechanisms interconnecting said separable contacts and normally holding said contacts in closed circuit position, a thermally responsive element in said circuit arranged to move one of one of said two pairs of separable contacts in response to overload current therethrough, a secondary thermally'responsive elementconnected in a shunt circuit around said first pair of separable contacts and arranged to move one of the other one of said two' pairs of separable contacts responsive to current flow therethrough, and means engageable with one of the said latch mechanisms upon predetermined movement of said first mentioned pair of separable contacts to unlatch said latch mechanisms to permit said first mentioned pair of separable contacts to open and means engageable with the other of said latch mechanisms to unlatch the second mentioned pair of separable contacts responsive to movement thereof occasioned by said secondary thermally responsive element, and secondary latch means for holding said movable contacts in open position and responsive in releasing action to reverse motion of said thermally responsive elements as occasioned by the cooling thereof.

2. The circuit breaker and recloser set forth in claim 1 and wherein the thermally responsive elements comprise spiral bimetallic elements.

3.;The circuit breaker and recloser set forth inv claim 1 and wherein the two pairs of separable contacts are positioned on two pairs '01 arms and wherein one of each of said two pairs of arms is aiiixed to a rotatable shaft and wherein said thermally responsive elements comprise spiral bimetallic'conductors arranged to rotate said shafts, and wherein the other one of each of said two pairs of arms is pivotally mounted on one of said shafts and wherein the shunt circuit around the said first pair of separable contacts comprises a shunt interconnecting said rotatable shafts. v i

4. The circuit breaker and recloser set forth in claim 1 and wherein each of the two pairs of separable contacts includes spring means normally biasing said pairs of contacts toward each other.

5. The circuit breaker and recloser set forth in claim 1 and wherein the means engageable with said latch mechanisms comprise stationary structural elements positioned in the path of said latch mechanisms.

BERTRAM C. ROGERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,071,848 Lindstrom Feb. 23, 1937 2,199,622 Dorfman May 7, 1940 2,361,221 Ludwig et a1. Oct. 24, 1944 2,436,909 Werner Mar. 2, 1948 2,462,244 Wise Feb. 22, 1949