Патент USA US2412857код для вставки
Dec. 17, 1946. 8, 2p, BAKER 2,412,857 CIRCUIT INTERRUPTER Filed Jan. 9, 1943 3 \ 52b 4 Sheets—Sheet 1 ‘ ATTORN IDGQ 17, 1946- B. P. BAKER ‘ 2,412,857 CIRCUIT INTERRUPTER Filed Jan. 9, 1943 4 Sheets-Sheet 2 24L 2.6 27 17 31 12 WITNESSES: W. ’ INVENTOR ?ery'ammP?ake? BY U1. ATTOR-N rmfatenied @ec. i7, _ g 1 ' uNlTeo stares PATENT Benjamin P. Baker, Turtle ill-cell, Pa" assignor to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Pennsylvania Application January's, 1943, Serial No. 471,34? 19 Claims. (or. 200-150) This invention relates to circuit interrupters in general and, more particularly, to are extin~ 'guishing structures and operating mechanisms therefor. a . ‘ put the ?uid disposed therein under pressure and to thus cause the motion oi‘the ?uid adia cent one or more or the serially related arcs to effect the extinction thereof. a An object of my invention is to provide an im ' Another object is to provide an improved cir proved circuit interrupter comprising a substan tlally closed chamber and to position the station ary contact external to the chamber so that dur ‘cuit interrupter of the type described in the im mediately preceding paragraph in which means are provided for effecting the lateral movement‘ ‘ing the opening operation an arc may be drawn from the stationary contact through an aper 10' of the pressure generating are so that the pres sure generating arc will contact fresh ?uid to ture-in the wall. of the chamber into the interior increase the pressure formed within the cham of the chamber. her. . Another object is‘ to provide an improved cir I Another object is to provide an improved cir cuit interrupter of the type described in the im mediately preceding paragraph and to provide 15 uit interrupter of the tym drawing a pressure generating arc and one or more series interruptmeans for putting the ?uid disposed within the ing arcs. I provide an interrupting unit adja chamber under pressure to cause an election oi’ cent the pressure generating are which not only at least a part of the ?uid out of the chamber increases the gas generation of the pressure gen~ and through the aperture to extinguish the arc. Another object is to provide ‘an improved cir 20 crating arc as compared to a plain break, but also adds interrupting ability to the entire circuit cuit interrupter comprising 9, substantially closed interrupter. chamber andto dispose a plurality of relatively stationary contacts external to the chamber. I Further objects and advantages will readily be come apparent upon a reading of the following also provide a plurality of movable contacts co specification taken in conjunction with the draw operable with the stationaryv contacts to draw a 25 ings, in which: plurality of serially related arcs through aper Figure 1 is an elevational view, partially in sec tures disposed in the wall of the chamber. Pref tion, or a circuit interrupter embodying my in; vention and shown in the closed circuit position; apertures to extinguish the serially related arcs. 30 Fig. 2 is an enlarged cross-sectional view taken erably I put the ?uid disposed in the chamber under pressure and cause its ejection out of the substantially on the line iii-H of Fig. l and also shows the interrupter in the closed circuit posi Another object 'of my invention is to provide an improved circuit interrupter having improved piston means for facilitating circuit interruption. I associate a series coil with the piston meansjto assist the actuation of the piston means during the interruption of high currents. ’ tion; Fig. 3 is an enlarged fragmentary view taken on the line III-4H1 of Fig. 2 but showing the dis 35 position of the contacts during‘ a circuit opening Another object is to provide an improved cir operation; Fig. 4 is a view in cross-section taken on the ‘line IV—IV of Fig. 3; chamber having a pair of stationary contacts dis_ posed externally of the chamber and substantially 40 Fig. 5 shows a modi?cation of my invention; Fig. 6 is an enlarged elevational view in cross on opposite sides thereof. I provide suitably dis section of an interrupter shown in the closed posed apertures adjacent to the stationary con circuit position similar to Fig. 2 but embodying } tacts in the walls of the chamber through which a modi?cation of my invention; a pair or movable contacts are actuated to draw a plurality of serially related arcs from the sta 45 Fig. 7 is a fragmentary enlarged view in ele vation, partially in section, taken on the line tionary contacts through the apertures and into‘ VIL-VII of Fig. 6; ' ‘ ' ’ cuit interrupter comprising a substantially closed the chamber. Preferably I dispose improved in terrupting means adjacent to the apertures to facilitate the extinction ‘of the serially related arcs. . Another object is to provide an improved “cir cuit interrupter comprising a substantially closed chamber in which a plurality of serially related arcs are established. I contemplate establishing a pressure generating are within the chamber to 55 Fig.‘ 8 is an enlarged fragmentary view taken on the line VIII-VIII of Fig. 6 but showing the ' disposition of the contacts during a circuit open ins operation; and Figs. 9 through 26 show plan and sectional views in cross-section of plate details utilized in the interrupting units employed in the modi?ca tion of my invention shown in Fig. 6. Referring to the drawings and more particu- ‘ ' asraesr 3 'larly to Figure l, the reference numeral l desig nates a tank ?lled to the level 2 with a suitable arc extinguishing ?uid, in this instance oil. Clamped to the cover 3 of the tank I are two in sulating bushings li. Depending from the lower ends of the insulating bushings ll are conducting brackets 5 which rigidly support in position’ two At the upper end of the casing it I dispose piston means generally designated by the refer ence numeral 36. The piston means 35 com prises a cylindrical iron member 36 screwed into an aperture 36a formed in the cover plate la. The cylindrical iron member 36 has a lower ?ange portion 3'! which supports a guide cylinder ~38 made of a non-magnetic material, in this instance substantially closed chambers generally desig brass. A series coil 39 is disposed between the nated by the reference numeral e. A conducting bridging member ‘l arranged for 10 iron member at and the brass guide cylinder 36 and is electrically connected in series circuit vertical longitudinal reciprocating motion by by means of the connector fit, the other end of means of an insulating lift rod s electrically con which is electrically connected to the support nects the chambers '5 in the closed circuit posi bolt (ii which supports the conducting bracket 5 tion of the interrupter asshown in Fig. 1. Dis connect ?ngers 9 electrically engage the bridging 15 to the cover plate it. The other end of the series coil as is electri-~ member 7 as shown. Disposed externally of each cally connected by means of the connector :32 to chamber 6 are two insulating operating rods to the stud bolt 633 which secures the annular con-' _ biased ‘downwardly by compression springs ii, ducting bracket 23 to the casing i'i. the latter being disposed between washers l2 Operating within the brass guide cylinder 8% rigidly secured to the rods it and ?xed guides 20 is a piston armature as composed of a suitable 63 rigidly secured to the chambers 6. Operating levers is connected by the pins are , magnetic material, in this instance iron. Within the piston armature as is a valve 65 which is ‘to the rods l0 rotate torsion shafts i5 (see Fig. 2) slightly biased to a closed position by'the com which actuate the movable contact structure pression spring £35m The'compression spring (46a disposed within the chambers 5. Electrostatic exerts just enough upward biasing force to over- > shields It are disposed at the lower ends of the come the weight of the valve 65. chambers 6 to minimize corona formation. The upper end of the piston armature as is Referring more particularly to Fig. 2, it will pivotally mounted by a pin it to a lever til, the be noticed that the chamber 6 comprises a cylin drical insulating casing i'l having at its upper 30 latter being pivotally supported at its right» hand end by a pin £8 to the bracket 59. A ten end an insulating cover plate is threadedly se sion spring so biases the left-hand end of the cured thereto. Levers is rigidly secured to the lever er in a downward direction. torsion shafts it are utilized to actuate the In this embodiment of my invention the in- ' movable contacts 211. The movable contacts 20 sulating operating rods is are bridged at their have rear guide portions 2!, the purpose for upper ends by an insulating cross rod El which which will appear more clearly hereinafter. engages in the closed circuit position of the in Stationary contacts 22, in this instance com " terrupter the lever d7. prising segmental conducting members, are sup In the closed circuit position of the inter ported on annular conducting brackets 23 rigidly secured by screws to the cylindrical insulating 40 rupter the electrical circuit therethrough com casing 51. A helical tension spring 24 biases the - _ segmental contacts 22 into engagement with vthe movable contacts 20 as shown. Disposed on opposite sides of the cylindrical prises the conducting bracket 5, support bolt 4|, connector M, series coll 39,‘connector t2, stud i bolt 43, annular conducting bracket 23, upper stationary contacts 22, upper movable contact 20, connector 53, intermediate movable contact 2d, intermediate stationary contacts 22, con nector 5t, lower stationary contacts 22, lower movable contactszli, connector 55;, movable pres sure generating contact 36. stationary pressure insulating casing I‘! from the stationary contacts 22, are‘ insulating guide cylinders 25 having in sulating cover caps 26. Disposed iy‘within‘ the guide cylinders 25 are insulating guide spiders 21 which cooperate during the opening operation with the guide portions 2| to produce straight 50 generating contact 3!, stud 32, connector 38. elec- I trostatic shield 66, disconnect ?ngers 9, movable line movement of the movable contacts 211. Slots conducting bridging member ‘I to the right-hand 28 disposed in the levers i9 cooperate with pins chamber 6 ‘through which the circuit passes in 29, the latter rigidly secured to the movable atsismilar manner to the upper right-hand brack contacts 20, to cause the opening and closing motion of the movable contacts 20 in'response 55 When it is desired to. open the electrical cir to rotation of the levers is as a result of rotation cuit through the interrupter shown in Fig. l the . of the torsion shafts I5. insulating lift rod 8 is actuated downwardly by e . ' At the bottom end of the lower lever is is a suitable mechanism, not shown, to cause down movable contact 30 which cooperates with a stationary contact 3i to establish a pressure gen 60 ward movement of the conducting bridging member 1. The conducting bridging member 1 erating arc during the opening operation of the slides downward in the disconnect fingers9, but interrupter. A stud 32 electrically connects the . stationary contact 3i to a connector 33 which maintaining electrical contact therewith. The initial downward movement of the conducting, is secured to the electrostatic shield IS. The disconnect ?ngers 9 in this instance are rigidly 65 bridging member 1 permits the compression springs ii to cause downward movement of the. secured to the electrostaticshield M as shown. insulating operating rods Ill. The downward the electrostatic shield It being threadedly se movement of the insulating operating rods Ill cured to the lower end of the casing l1 and clos causes a counterclockwise ‘rotation of the operat ing the lower end thereof. Two vertically up standing insulating plates 34, only one of which 70 ing levers M as viewed in Fig. 2. The counter. clockwise rotation of the levers II as viewed in is shown in Fig. 2, provide means for preventing Fig. 2 causes a counterclockwise rotation of they the pressure generating are established upon the torsion shafts IE to result in counterclockwise separation of the movable contac't‘ill from the rotation of the levers IS. The counterclockwise stationary contact 3| from contacting the casing rotation of the levers 19 causes the simultaneous 75 I1. and injuring the same. . 9.412.382? ' ‘ 4: formation or four serially related arcs associated extinction. vents 60 (see with each chamber a The are drawn between the movable contact as and the'stationary con- in the washer members ~ Certain features or" the l tempting units 4) be provided tact 39 is a pressure generating are which puts are described and claimed and the theres the ii-uid, in this instance oil, disposed within the 5 of given in my application filed May 153, i940, chamber 6, under pressure. The oilwithin the Serial No. 335,218, which issued December 8. i942 chamber c being under pressure assists in the as Patent 2,304,529 and which was assigned to interruption of) the other. three serially related arcs associated with the chamber '8. Following the assignee of this application. In place or‘ the interrupting unit bl’ shown in the interruption of any one of the serially re- 10 Fig. 3, an insulating nozzle 69 may be used, being . lated arcs the circuit through they entire interrupter is broken, and the further downward threadedly secured in the apertures 56 provided in the casing i"! as more clearly shown in 5. movement of the conducting bridging member? When this construction is used‘the arc Bl is breaks electrical engagement with the ringers 9 established centrally within the nozzle 69 and is and produces tw isolating gaps in the circuit, .15 subjected to a- now oi’ ?uid indicated by the one gap being in ed between each pair of disconnect ?ngers 9 at the lower end vof each chamher 8 and the movable conducting bridging memher 1. Consequently, in the open circuit position of the interrupter all potential stress is removed .20 from the chambers 6. V The interrupting means associated with each pair of relatively movablecontacts will now be descrlbed. Apertures 56 are formed in the side walls of the casing ll adjacent the stationary 25 contacts 22. Also disposed adjacent each stationm‘y contact 22 is an interrupting unit, gen- verally designated by the reference numeral 51 and shown enlarged in Fig. 3. The interrupting arrows in Fig. s. It will be apparent that the tension spring 59. (see Fig. 2) may initially assist the compression springs Ii in biasing the operating meechanism to the open circuit position. During the inter ruption of high short circuit currents the pres sure generated by the pressure generating arc established between the contacts 30, 3| will cor respondingly be high to produce a high pressure within the chamber to‘. This high pressure will cause ?uid to ?ow through the interrupting units 51 to extinguish the arcs drawn therein in the manner previously described. During the interruption of low currents the unit or comprises a plurality of insulating 30 pressure generated by the contacts 30, Si is cor washer members 58 (see Fig. 4) having relatively large internal diameters. Alternately disposed respondingly low, and supplementary means for raising the pressure within the chamber 8 is de between the insulating washer members 58 are sirable. In this event the piston means 35 assists insulating washer members 59 having relatively the pressure generating arc drawn between the small inner diameters as more clearly shown in 35 contacts 3, 535 to raise the pressure within the Fig. 4. The washer members 58, 59 are supchamber It will be apparent that upon down~ ported by tie bolts Gil. The washer members ward movement or the insulating rods lo the 58, 55 when assembled on the tie bolts 80 provide cross rod Eli and the roller 62 will also move down a plurality of annular recesses 6| (see Fig. 3). to permit the tension spring to to force the lever An insulating bushing J32 is threadedly secured 40 41 in a counterclockwise directionobout the pivot in the aperture 55 and has a corrugated inner pin 48 to result in the piston armature 45 being surface as as shown, The annular corrugations forced downwardly to compress the ?uid within ' $3 in the bushing 62 cooperate with the annular the chamber t. Consequently the piston arma recesses 6! provided by the washer members 58, Wm M assists ‘the Pressure generating are drawn as to provide an interrupting unit 51 having an 45 between the contacts 353. 35 to raise the pressure ‘ annularly corrugated inner surface_ within the chamber during the interruption of The inner insulating ‘plate as (see Fig. 3) has a guide portion 65 (see Fig. 2) which assists in low currents. This increase of pressure within the chamber facilitates the interruption of the guiding the movable contacts 20. The guide porarcs Within the interrupting wills . tions as are enlarged at so (see Fig. 3) to permit 50 It will be apparent that the series coil 39 will ?uid ?ow from within the casing l1 through the move the piston armature (‘l/l downward. in any interrupting unit 51 and out between the stamagnetic circuit composed of movable parts the tlonary contacts 22 as shown by the arrows in parts tend to move in a direction adoring least. Fig. 3. When the movable contact 20 separates reluctance to the magnetic flux. Since the re from the stationary contacts 22 during the open- 55 luctance 0f the piston armature 5x3 is relatively ing operation, an are a‘! is established which is subjected to a longitudinal ?ow of fluid through the interrupting unit ‘57 and out between the Small as compared with the brass guide cylinder 33, the piston armature (is will be moved down info the center or the series coil 39 to a point _ stationary contacts 22. When the instantaneous ' ‘where the reluctance offered to the magnetic value of the current through the arc 61' decreases 60 ?ux is a minimum. .21 its cyclic variation the longitudinal ?ow through the interrupting unit 51 carries with it the hot ionized gases and that portion of the oil It ‘Will consequently Tie apparent that I have provided means for assisting the tension spring 50 in operating the piston means 35 during high which has lost its dielectric strength as a result- short circuit currents at a time when high pres - of its contact with the arc, so that as the current 65 sure within the chamber a is desirable to effect zero approaches, the last thread of conducting ‘ the interruption of the high current arcs G1 estab ionized gas is surrounded by fresh clean turbu- ,. lished between the stationary contacts 22 and the lent oil, which quickly transforms the entire arc movable contacts so. The assistance furnished path from one of. fair conductivity to one of good by the series coil 3i? will obviously decrease as the insulation. This ?uid ?ow causes the dielectric 70 current through the series coil 39 decreases. strength of the space within the interrupting Thus during the interruption. of small currents unit 51 to rise so rapidly that the recovery voltthe tension spring til may be relied upon to op age is unable to reestablish another half cycle - crate the piston means it. However, during the oi arcing. To allow the gas to escape from the interruption of high short circuit currents the recesses of the interrupting unit following arc 75 current through the series coil 39 will be increased earnest and in this event both the tension spg Eit and the series coil 89 will cooperate to force the piston armature (it downward to raise the pressure 8 ' I ?ngers 9 to the ating bottom plate it.‘ The other end ofthe series coil ‘it is connected by the connector at to the stationary contact iii. A bolt iii ‘electrically connects the metallic top cover plate ‘it to a connector 82, the lower end of ' . A further advantage of the coil 39 is that it which is electrically connected to the upper con exerts its force on the piston lid immediately ducting bracket 23. . when the high current or short circuit is estab Consequently, in the closed circuit position of " lished. This speeds up the opening movement the interrupter shown in Fig. 6 the electrical cir of the contacts and exerts considerable pressure _10 cuit therethrough comprises the conducting within the chamber d. on the oil. even before the pressure tong are between contacts to and iii is formed, or has reached sumcient length to become very effective. For high speed operation this feature is very important. _ During the closing of the interrupter the valve is as will open to permit ?uid, in this instance oil, bracket 5, plate it, bolt Eli, connector 82, con ducting brachet 23, stationary contacts 22, mov= able contact 2@, connector as, intermediate movable contact 2d, intermediate stationary contacts 22, connector 56, lower stationary contacts 22, lower movable contacts 26, connector lib‘, movable contact to, stationary contact 8i, connector tit, series coil ‘it, connector ll, stud bolt l8, discon nect ?ngers e to conducting bridging member ‘i. _ to ?ow into the interior of the chamber t through provision of the ‘the piston armature (ill. valve to speeds up the closing operation, and also The circuit then passes through the conducting' insures that fresh ?uid will enter the chamber e 20 bridging member ‘8 to the other chamber t through the top thereof during the closing opera through which the circuit passes in an identical tion. During the opening operation the valve to manner to the other line terminal not shown. will, of course, remain closed. 7 . Associated with the lower contacts 3i, so is an It is thus apparent that any breaker operation interrupting unit generally designated by the rei _ at low current or at no current will cause the 25 erence numeral 88. The unit 83 comprises an piston to and valve or to operate as a pump, cir end insulating‘ plate 865, the con?guration of culating ?uid in the top through the ‘valve Q6 which is more clearly shown in Fig. 7. Refer and out through the interrupters 5i, thus re ring to Fig. '7, it will be observed that the end. the casing ill, with fresh .oil 30 insulating plate 85 ‘has a cutout portion $5 to from the larger. volume in tank i. accommodate the movement of the movable con During the closing operation the insulating lift tact so. Immediately adjacent to the end insu rod 8 moves upward to raise the conducting bridg- ‘ ' lating plate 841 'is a pocket insulating plate 86 ing member ‘l. The conducting bridging member which forms a plurality of pockets t‘i more clear '5 ‘?rst electrically engages the disconnect ringers ly shown in Fig. 7. The pockets 81 retain a 35 9 and slides upward between them. Further up plentiful supply of fresh ?uid ready to be acted ward movement of the conducting bridging mem upon by the pressure generating are established - placing the oil in ber ‘i ‘ raises the insulating operating rods it etween- the contacts 30, 3!. against the bias of both the compression springs Immediately adjacent to the pocket insulating H and the tension spring 5b. This upward‘ move plate 86 is a group of three insulating plates, the ment of the insulating rods it rotates the operate 40 center one of‘ which is herein called an insert ing levers it, the torsion shafts i5 and the levers insulating plate 88. The insert insulating plate is to result in contact being made between the 85 has a con?guration, in this instance identical movable contacts 20 and the stationary contacts with the con?guration of the end insulating plate 22 to e?ect a closing of the circuit through the . 85. The insert insulating plate 88, however, has interrupter. ' a recess disposed therein to accommodate the in It will be obvious that I have positioned the sertion of an insert of magnetic material 89, in 22 externally of the chamber ~ stationary contacts this instance composed of iron and having a con- . 6. This has distinct advantages. The movable ' ?guration more clearly shown in Fig. '7. On each contacts to establish and draw the arcs W from side of the insert insulating plate 88 is a guard ' the stationary contacts 22 through the apertures insulating plate 90 having a configuration iden 58 and into the interior oi’ the chamber 8. By tical to the and insulating plate 84. Tie bolts 9| initiating the arcs 6? outside of the chamber t rigidly secure the insulating plates into position, there is thus provided sumcient space for venting and they are supported in spaced relation above around the stationary contacts 22. Also this the insulating bottom plate 19 by a bracket 92 construction has the additional advantage of hav secured by screws 93 to the bottom insulating ing the stationary contacts 22 exposed for ready plate 1'9. The plates within the interrupting unit inspection, adjustment and cooling. 83 may be repeated. , In the embodiment of my invention ‘shown in When the movable contact 30 is separated from Fig. 6 the insulating casing ill has a metallic top the stationary contact 3| a pressure generating 60 cover plate to threadedly secured thereto. A arc is established. The magnetic inserts 89 dis cylindrical member ‘ii composed of magnetic tort-themagnetic ?eld about the pressure gen material, in this instance iron, is threadedly se erating arc to cause it to move downward as cured in an aperture ‘Ha provided in the insu indicated by the arrow 92a in Fig. 7 into the . lating bottom plate 19. A guide cylinder 12 com lower portion ill of the interrupting unit 83, posed of a suitable non-magnetic material; in where the pressure generating arc constantly this instance brass, is supported by an annular contacts fresh ?uid, in this instance oil, to gen plate 12a, the latter being composed of a suitable erate increased gas and hence to greatly increase ' magnetic material, in this instance iron. A pis the pressure within the chamber 6. ton armature 13 having a valve 16‘ disposed there By my providing the magnetic inserts-89 the in is biased downwardly by a compression spring 70 pressure generating arc established between the 15. Disposed between the iron cylinder member contacts 30, 3| will be biased downwardly into ‘II and the'_ brass guide cylinder 12 is a series coil the lower portion 94 of the interrupting unit 83 16 connected in series circuit.v One end of the to constantly be maintained at-the gas-oil bound series coil 18 is connected by the connector ‘II to cry and thus to generate an increased amount of 75 the stud. bolt 18 which secures the disconnect - atlases ‘ ‘ ' I; 9 . , ‘ id . gas. The increased amount of gas formed as. a charge plate 101, an ori?ce plate 503, an insulat result of the lateral movement of the pressure ing inlet plate I04, and ?nally an‘ end insulating generating arc increases the pressure within the plate 500 the con?guration of which is more chamber 8. It will, furthermore, be obvious that not only-does the interrupting unit 88 function . clearly shown in Figs. 25 and 26. The insulating end plate I08 has a central aperture 99 and two _ to move the pressure generating arc laterally to . cutout portions Q00. effect increased pressurewithin the chamber 0, Referring to Fig. 8 it will-be observed that upon assembling the several insulatingplates within guished by the interrupting action furnished by 10 the insulating cylindrical member 96, the‘centrai the interrupting unit 83. ' apertures 99 align to form an‘ arcing passage means generally designated by the reference - Even if the magnetic inserts 89 are omitted so but also an interrupting action takes place so that the pressure" generating are thus may be extin that comparatively little lateral motion of the‘ 7 pressure generating arc takes place, still the drawing of said arc past the pockets 81 con-_ 15 stantly causes fresh liquid to engage the arc and hence to greatly increase the pressure‘ within-the chambert and the interruptingability of the en tire circuit interrupter. numeral I01. It will also be observed that the cutout portions I00 align to form P8858868 which communicate at their inner end with the interior of the chamber 0, and serve to force ?uid into the arcing passage means I01 at a plurality of . spaced points therealong.‘ Referring to Fig. 8 it will be ‘observed that the cutout portions I00 also ' _ Consequently, in this embodiment of my inven 26 serve to provide discharge passages which lead ‘ to the region external to the chamber 8 and which _ on, I have provided four eifective interrupters are spaced at a plurality of spaced intermediate associated .with each chamber 0, the lower inter rupter 83 not only affording an interrupting ac _ points along the passage means I01. The direc tion but also‘considerably raising the pressure within the chamber 0 to effect ?uid ?ow through the three’interrupting units 95 associated with. the other three serially related arcs drawn during an opening operation of the interrupter. General aspects of the interrupting unit 183 have ‘been described and claimed in the following pat-. 30 ents, 1,899,605 which issued February 28, 1933, to Benjamin P. Baker and Ernest G. Kees; tion of the fluid discharge is shown by the arrows in Fig. 6. The direction of now of the ?uidfrom the interior of the chamber 6 into the arcing passage means it? is indicated by the arrows in Fig. 8. It will be obvious that the fluid entering the interrupting unit 95 through the inlet plates I00 may either exhaust directly between the. sta tionary. contacts 22 or pass through the central aperture 99 in the orifice plates I03 to exhaust through the discharge passages I02 provided 1 1,911,072 which issued May 23, 1933, to Lloyd W. Dyer and Winthrop M. Leeds; 1,914,137 which I -issued June 13, 1993, to Winthrop M. Leeds; 35 the insulating discharge plates I 0|. General features of the interrupting unit 90 1,991,901 which issued February 19, 1935, to are described and broadly claimed in an appli Winthrop M. Leeds; 2,039,054 which issued‘ April cation entitled "Circuit interrupter” ?led Novem 28, 1936, to Samuel H. Boden and Stanley T. ' her 11, 1942, Serial No. 465,244, now U. S. Patent Schofield and 2,138,382 which issued November 2,406,469, issued August 2'1, 1946, by Leon R. 29, 1938, to Winthrop M. Leeds and Ennio Or 40 Ludwig, Winthrop M. Leeds and Benjamin P. tensi, all of the foregoing patents being assigned Baker and which was assigned to the assignee of to the assignee. of this application. this application. The interrupting units 95 will now be described The operating mechanism shown in Fig. 6 cp with particular attention directed to _Fig. 8. An erates in a manner identical to the operating insulating cyclindrical member 90 is threadedly previously described in connection secured in the apertures 50 provided in the cas ~ mechanism with Figs. 1 and 2. A further description thereof, ing I1. The insulating cylindrical member 96 consequently, seems unnecessary. It will be ob-’ has disposed at each end ?ange portions 91 which served that by varying the distance between the serve to compress and hold in rigid position a plurality of insulating plates which form the in 430 pins E08 rigidly secured to the insulatingoperat ing rods I0‘ and the. torsion shafts I5, the speed terrupting unit 95. At the inner end or the interrupting unit 95 is . of rotation of the levers 19 as a. function of the downward velocity of the conducting bridging disposed an end insulating plate 98, the con?g member 1 may be varied. Obviously, by increas uration of which is more clearly shown in Figs, 9 and 10. The insulating plate 98 has formed d5 ing the distance between the pins I08 and the torsion shafts ie, the rotation of the levers I9 therein a. central aperture 99 and two cutout por and, consequently, the speed of operation of the tions l00, the purpose for which will appear more contacts 20, 22 may be increased with respect to clearly hereinafter. the downward velocity of the conducting bridging Immediately. adjacent to the and insulating member °l.' _ 1 plate 98 is an insulating discharge plate IOI the 60 I have provided small vents I09 at the top of con?guration of which is more clearly shown in the chambers 0 to permit any accumulated gas Figs. 11 and 12. The insulating discharge plate formed during an opening operation to escape‘ i0I has‘two discharge passages I02 and two out but of the chamber 9. rThis helps to maintain out portions I00. Immediately adjacent to the the dielectric strength of the ?uid within the insulating discharge plate I 0| is an insulating ori?ce plate I 03, the con?guration of which is more clearly shown in Figs. 13 and v14. The in sulating ori?ce plate I03 has a central aperture 99 and four cutout portions I00. chamber 8 at a high value. ' I It will be observed that the series coil 10 will cause the actuation of the piston armature 13 upward to assist raising the pressure within the Immediately adjacent to the ori?ce plate I 052 70 chamber 0 during the interruption of high short circuit currents. Thus during the interruption is an insulating inlet plate I04‘, the con?guration of which is more clearly'shown in Figs. 15 and 16. - The insulating inlet plate I04 has two entrance ' passages I05 and two cutout portions I00. Then ‘follows an ori?ce plate I03, an insulating dis of high short circuit currents there is not only an increased pressure caused by the pressure gen erating are drawn between the contacts 30, 3|, but also the piston armature 13 is then actuated against the biasing action of the compression I amass? ~ , a 11 , spring ‘it to further raise the pressure within .the chamber 6. The rise in pressure within the chamber d is desirable during the interruption.‘ oi high short circuit currents to e?ect the necessary ?uid ?ow through the interrupting units 95 to e?ect the extinction of the arcs bi drawn between the sta= tionary contacts 22 and the movable contacts it 12 circuit interrupters used in gaseous mediums or even in air. If the circuit interrupters are oper ated in a gaseous medium, for instance air, the several insulating washers used in the interrupt ing units 57, the insulating plates used in the interrupting units 95 and the insulating plates‘ used in the interrupting units 83 may all be com posed of a suitable material which evolves a vapor upon being subjected to the action or an electric in Fig. 6. > ' It will be observed that when the current being 10 arc. Such a use of gas evolving material would facilitate the interruption of the arcs. interrupted is high the biasing action exerted by The term ?uid as used herein and in the ape the inserts at. is greater and hence a greater pended claims comprises liquids, vapors, gases and _ volume of gas- will be formed at the pressure sprays. generating are drawn at the contacts 3t, iii to Although I have shown and described speci?c increase the pressure within the chamber 6. Dur embodiments of my invention, it is to be clearly ing the interruption of low currents the series coil ‘to will not be as e?ective as on the interruption understood that the some were merely for pur poses of illustration, andthat changes and modi of high short circuit currents to cause upward ?cations may be made ‘without departing from movement of the piston armature ‘it. Thus I have provided a means for utilizing the 20 the spirit andvscope of the appended claims. I claim as my invention: ‘ high short circuit currents to effect increased 1. In a circuit interrupter, means de?ning a. pressure within the chamber e during the inten substantially closed stationary chamber, a plu ruption of high short circuit currents. rality of relatively stationary contacts mounted When the piston armature ‘it is actuated up. wardly, the valve ‘it remains closed. When the 25 external to the chamber so as to be freely vented,‘ a plurality of apertures in the wall of the cham compression spring ‘l5 returns the piston arma= her, a plurality of movable contacts movable away ture ‘it to its lower position the valve ‘id opens from the stationary contacts and through the to permit oil to ?ow into the chamber 6. . apertures to within- the chamber to draw a plu Although I have shown tour serially related breaks associated with each chamber 8, not count 30 rality of serially related arcs through the aper tures, and means other than the arcs for putting ing the disconnect break, it is apparent that for the ?uid within the chamber under pressure to a higher voltage-more breaks could be used. cause an ejection of ?uid out of the chamber and Since the magnetomotive force of the series ' coils 39 in Fig, 2 and it in Fig. 6 isproportional through the apertures substantially longitudinally tov the product of-the number of turns in the 35 of the arc to extinguish the arcs. 2. In a circuit interrupter, a substantially‘ en series coils and the electric current ?owing through the series coils, it is readily‘ apparent . closed stationary chamber, a pair of stationary . contacts ‘mounted substantially on opposite walls that by increasing the number of turns in the of the chamber so as to be freely vented, a pair series coils 89, ‘it the respective piston armatures til, ‘it will be actuated at correspondingly lower 40 of apertures through the walls of the chamber disposed adjacent to the two stationary contacts, current values. Consequently, by increasing the a pair of cooperable moving contacts separable number of turns in the series coils, the pistons from the stationary contacts to draw two serially will be operativeat lower current values to in related arcs adjacent the two apertures, lever crease the‘pressure within the chambers t. The means for causing motion of the pair of moving number of turns ‘in the series coils 39, ‘it will contacts, means other than the arcs for putting then be determined by the operating conditions ?uid ‘within the‘ chamber under pressure to force required. . , It will, furthermore, be observed that in the . the ?uid out the apertures adjacent the arcs to e?ect the extinction of the same, and a torsion operation of_ the interrupter shown in Fig. 2 it the pressure within the chamber 6 becomes very 50 shaft for causing motion of the lever means. 3. In a circuit interrupter, a substantially en high during the interruption or high currents closed chamber, a plurality of pairs of stationary the piston means 35 may be held in its raised position, the insulating cross rod M and the _ 'roller ' contacts, an aperture through the wall of the chamber adjacent each contact, each pair of sta $2 meanwhile separating from the lever 41. In this event the tension spring ill will not assist 55 tionary contacts being mounted substantially on opposite sides of the chamber, a plurality of pairs the compression springs H to bias the operating of moving contacts to draw a plurality of arcs adjacent the apertures, a plurality of levers for causing the motion of the pairs of moving con - sidence of the pressure within the chamber 8 of Fig. 2 after interruption the piston means 35 60 tacts, a plurality of torsion shafts for causing the motion of the levers, means for putting ?uid dis will then be operative due to the tension in the mechanism to the open circuit position. v Also in this event it will be apparent that upon the sub tension spring 50 to ?ush contaminated ?uid out through the apertures 58 in the casing- i1. As mentioned previously, however, the turns in the posed within the chamber under pressure to effect _ an ejection ofthe same out the apertures to ex tinguish the arcs, and means for simultaneously the rotation of the levers. series coil 39 may be increased to such an extent 65 causing 4. In a circuit interrupter, a. substantially that the piston means 35 will be operative even :losed stationary chamber, a pair of stationary during the existence of high pressure within the contacts mounted externally of the chamber so chamber 6 caused by the interruption of high as to be freely vented and substantially on oppo currents. ’ It will be readily ‘apparent that although I have 70 site sides thereof, a pair of apertures in the wall of the chamber adjacent the stationary contacts, shown my invention as applied to liquid type a cooperable pair‘ of moving contacts movable circuit interrupters, the some were merely for, away from the pair of stationary contacts to draw purposes of illustration and my invention is not two serially related arcs through the pair of aper limited to use only in liquid type circuit inter rupters, but also may be used in connection with 75 tures, means for putting ?uid disposed within it . across? the chamber under pressure to eil‘ect an election of the same out the apertures to extinguish the 41 . _ arcing surface of each interrupting unit having a plurality of recesses to forms corrugated arc area-a lever for simultaneously causing the mo tion of. the pair of moving contacts, and ‘means in: surface, a pair or movable contacts cooperable pivotally mounting the lever intermediate its > with the pair of stationary contacts to draw two ends. . serially related arcs through the pair of aper~ > , tures and into the pair of interrupting units, le- , 5. In a circuit interrupter, a chamber, piston ver means for simultaneously actuating the pair means for-putting the fluid within the chamber > under pressure, spring means for urging the actu of movable contacts, and means for putting ?uid within the chamber under pressure to cause the > 10 rupter opening operation, and a series coil to election of ?uid through the pair of interrupting units and out the apertures to effect the extinc assist the spring means during the opening oper ation. ‘ tion of the arcs. 10. In a circuit interrupter, a substantial ' 6. in a circuit interrupter, a substantially sta-v tionary closed‘ chamber, a pair of relatively sta 1y closed chamber, means for establishing a plu tionary contacts mounted externally of the cham~ 15 r'ality of serially related arcs within the cham ber, means for putting liquid disposed within the ~ ‘her so as to he freely vented and substantially onv opposite sides thereof,- a pair of apertures in the “ the pair of station chamber under pressure to facilitate the extinc- - contacts movable through the pair of apertures from within the chamber to engage the pair of affecting the magnetic field about the pressure it to move into engage~ ment with fresh liquid to give increased pressure tion of the arcs, said last-mentioned means com prising relatively movable contacts separable ‘to posed in one of~v the apertures, a pair orv movable 20 establish a pressure ‘generating arc, and means stationary contacts in the closed circuit position of the interrupter, means for simultaneously ac 25 - within the chamber. 11..In a ‘circuit interrupter, two substantially tuating the pair of movable contacts away from the vpair of stationary contacts and through the closed chambers, rnovahlecontact structure dis~= posed, in each chamber, a plurality of torsion pair of apertures to draw two serially relatedarcs shafts extending through the walls of each cham through the apertures, and means other than the arcs for putting the ?uid within the chamber un 30 bar to operate the movable contact Structure dis= der pressure to cause the election of the ?uid- out ' posed therein, arr-operating lever connected to of the chamber through the‘ apertures to extin each shaft, at least one operating rod for each guish the arcs‘, chamber which is connected to the plurality of 'l‘, in a circuit operating levers associated therewith? and a con interrupter, a substantially closed chamber, a pair of stationary contacts mounted externally of the chamber and substan tially on opposite sides thereoi, a pair of apertures 35 formation of two disconnect gaps in the series circuit, the bridging member also causing the how tuation of the operating rod associated ‘with each in the wall of the chamber adiacent the pair oi’ stationary contacts, a pair of interrupting units disposedadjacent the pair of apertures, the arc ing surface oi’ each interrupting unit having a ducting bridging member operable to cause the chamber. - 40 plurality of recesses to form a corrugated arcing surface, a pair of movable contacts cooperable with the pair of stationary contacts to draw two serially related arcs through the pair of apertures 45 and into the pair of interrupting units, and means for putting ?uid within the chamber under pressure to cause the ejection of fluid through the pair of interrupting units and out the apertures chamber under pressure, and means for directing to effect the extinction of the area. 8. In a circuit interrupter, a substantially the ?uid under pressure into the arcing passage means at a plurality of spaced points along the closed chamber, a pair of relatively stationary contacts mounted externally or the chamber and extinction of the arc. ' substantially on opposite sides thereof, a pair of ' adjacent one end of the passage means, a “coop erable movable contact movable through the arc ing passage means to establish an arc therein, - i 13. In > a circut interrupter, a substantially apertures in the Wall of the chamber adjacent the 65 closed chamber; a stationary contact mounted externally of the chamber, arcing passage means pair of stationary contacts, at least one insulating extending from the contact through the wall of nozzle disposed in one of the apertures, a pair of movable contacts movable through the pair of the stationary contact heing diam apertures to engage the pair of stationary con- ' tests in the closed circuit position of the inter~ 60 rupter, lever means for simultaneously actuating the pair of movable contacts away-from the pair of stationary contacts and through the pair of ‘. apertures to draw two serially related arcs through the apertures, and means for puttingthe 635 ?uid within the chamber under pressure to cause the ejection of the fluid out of the chamber through the apertures to extinguish the arcs. 9. In a circuit interrupter, a substantially closed chamber, a pair of stationary contacts 70 mounted externally of the chamber and substan tially on opposite sides thereof, a pair of aper~= arcing passage means to establish an arc therein, means for putting ?uid disposed within the shares her under pressure, and means for directing the means fluid under at‘ a plurality pressure ofinto spaced the points arcingalong the length of the arcing passage means to effect the extinction of the arc, and a plurality of discharge passages disposed at a plurality of spaces‘, inters mediate points along the length of the arcing passage means and communicating to the region exterior to the chamber. 14. In a circuit ' interrupter, a substantially tures in the wall of the chamber adjacent the closed chamber, a pair-oi’ stationary cents-lets pair of stationary contacts, a pair of interrupting mounted externally of the chamber and suh~ units disposed adjacent the pair of apertures. the 75 stantially on opposite sides thereof, a pair of movable contacts movable through the well of asiaesr . ‘ t5 the chamber to engage the stationary contacts in - the closed circuit position of the interrupter, an‘ interrupting unit disposed adjacent each station ary contact through which the movable contact passes to establish an arc therein, lever means for simultaneously actuating the pair of mov able contacts, means for putting ?uid within the chamber under pressure, each interrupting unit utilizing the fluid under pressure to direct a plu rality oiiets toward the arc established wi the unit from spaced points along the arc. re strikes the are at a plurality of spaced points along the arc, the unit also forming a plurality oi discharge passages spaced at intermediate points along the are which communicate with the region external to the chamber. 17. In a circuit interrupter, means for estab ' lishing a pressure generating arc and one or more series interrupting arcs, means utilizing the pres sure created by the pressure generating arc to ,as in 15.111 a circuit interrupter, a substantially closed chamber, a pair of stationary contacts mounted externally of the chamber and sub» stantially on opposite sides thereof, a pair of ~movable contacts movable through the walls of sist in e?ecting extinction of one or more of the interrupting arcs, and means for shooting lateral movement of the pressure generating arc to cause the latter to engage fresh ?uid to generate in creased pressure for effecting a more rapid inter“ ruption of the electrical circuit through the in terrupter. , _ ‘ 18. In a circuit interrupter, means for estab the chamber to engage " the ‘stationary contacts lishing a pressure generating arc and one or more in the closed circuit position of the interrupter, series interrupting arcs, means utilizing the press an interrupting unit disposed adjacent each sta sure created by the pressure generating are to 20 tionary contact through which the movable con ‘assist in effecting extinction of one or more of tact passes to establish an arc therein, lever the interrupting arcs, and magnetic means for means for simultaneously actuating the pair of e?'ecting lateral movement of the pressure gem movable contacts, means for putting ?uid within erating are to cause the latter to engage fresh the chamber under pressure, each interrupting fluid to generate increased pressure for e?ecting 25 unit utilizing the fluid under pressure to direct a a more rapid interruption of the electrical circuit plurality of jets toward the are established within the unit from spaced points along the arc, each, interrupting unit also providing a plurality of dis: through the interrupter. ' 16. In a circuit interrupter, a chamber, means . lishing a pressure generating arc and one or more _ charge passages iromspaced inte he»: ate points along the arc which communicate to the region external to the chamber. _ ' 19. In a circuit interrupter, means for estab= 30 series interrupting arcs, means utilizing the prea sure created by the pressure generating arc to assist in enacting extinction of one or more or the interrupting arcs, one or more ?uid retaining for putting ?uid within the chamber under pres pockets, means for lengthening the pressure gens sure, a stationary contact mounted externally of :- erating are past one or more of the fluid retag the chamber, a movable contact movable through pockets so that the pressure generating arc will a wall of the chamber to engage the stationary continue to engage, fresh ?uid to generate in. contact in the closed circuit position of the inter creased pressure for effecting a more rapid inter= rupter, an interrupting unit disposed‘ adjacent ruption of the electrical circuit through thein» the path of movement oi’ the movable contact, terrupter, and magnetic means cooperating with 40 the movable contact being separable from the p _ stationary contact to establish an are within the unit, the unit forming a plurality of entrance pas= sages through which the fluid under press saidillast-mentioned means to move the arc lat.» era y.