US2281042A - Circuit interrupter - Google Patents

Circuit interrupter Download PDF

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Publication number
US2281042A
US2281042A US313430A US31343040A US2281042A US 2281042 A US2281042 A US 2281042A US 313430 A US313430 A US 313430A US 31343040 A US31343040 A US 31343040A US 2281042 A US2281042 A US 2281042A
Authority
US
United States
Prior art keywords
circuit
contacts
piston
pressure
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US313430A
Other languages
English (en)
Inventor
John B Macneill
Benjamin P Baker
Andrew H Bakken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE483191D priority Critical patent/BE483191A/xx
Application filed by Westinghouse Electric and Manufacturing Co filed Critical Westinghouse Electric and Manufacturing Co
Priority to US313430A priority patent/US2281042A/en
Priority to GB286/41A priority patent/GB544755A/en
Priority to CH218492D priority patent/CH218492A/fr
Application granted granted Critical
Publication of US2281042A publication Critical patent/US2281042A/en
Priority to FR943606D priority patent/FR943606A/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic

Definitions

  • circuit nterrupters other than the air blast type.
  • each unit is provided with a separate 4or auxiliary pressure tank'of capacity sufcient to operate the individual breaker at least once in the event the main or central supply of.
  • auxiliary pressure tank as a support upon which the circuit interrupting elements and operating mechanism are mounted, thereby affecting economy in space required to house the breaker.
  • a more specific object of our invention is to provide a circuit breaker with the pressure tank and the operating and control mechanism grouped as aunit all at ground potential with the contacts and arcchamber supported on-the tank by means of insulating material which includes an insulating conduit for conducting gas from the tank to the arc chamber.
  • a further object of our invention resides-in the provision of a simplified moving contact structure f or a polyphase circuit breakerand proposes uniting the'moving contact .members in a single unitary structure including a single uid pressure operated piston for moving the contact members to open and closed circuit positions.
  • a further object of our invention is directed to control means for a gas pressure actuated operating mechanism for gas blast interruptels which prevents actuation of the contact mechanism if there is insufficient gas pressure available to move the contacts promptly to the open or to the closing position and if the gas pressure is invsuilicient to extinguish the arc.
  • Our invention also has for its object theimprovement of ythe opening operation of gas pressure actuated operating mechanisms by holding the contact structure in the closed position until substantially full operating pressure has been applied to the gas pressure operated piston and thereafter-'releasing the contact structure so as to obtain opening movement of the contact structure with a snap action.
  • Figure 1 is a front elevational view' of a cir cuit interrupter illustrating our invention
  • Fig. 2 is a side elevational view of the interrupter lshown in Fig. 1;
  • Fig. 3 is a schematic illustration of the operating mechanism of our circuit interrupter and the control system therefor.
  • Fig. 4 is a schematic development -of the auxiliary switch used in the control system of our invention, showing the relative positions of the contact structure for both the open and closed positions of the circuit interrupter.
  • the reference numeral 5 designates a pressure tank for storing gas, such as air, which is preferably supplied from a central source of pressure, not shown.
  • gas such as air
  • Secured to the upper side of the tank 5 is a framework composed of transverse bars 'I joined by longitudinal extending support bars 9, II, I3 and are similarly arranged and supported upon the bars I3 and I5.
  • the insulators l1 and I9 are grouped .in pairs and provide the support for three the contacts and the air chutes.
  • comprises a stationary contact assembly 23 and a coacting movable contact 25.
  • the contacts 23 and 25 when in the closed circuit position are surrounded by an arc chute 21 of insulating material.
  • the moving contacts 25 are preferably of bladelike construction and operate into and out of engagement with the'stationary contacts 23 through a relatively narrow throat-like portion 29 of the arc chute 21.
  • Each contact blade 25 is guided in its reciprocating movement by a support arm 3
  • are provided'with yielding contact fingers 33 which bear on opposite sides of the contact blade 25 so as to establish a good electrical conterminal 31, stationary contact 23, moving contact blade 25, contact iingers 23, guide bracket 3
  • Each oi the moving contacts 25 is secured at its lower end to an'insuiator 39 which, in turn, are rigidly mounted at their lower-.ends to a transversely ex-
  • the beam Il is provided with tending beaml 4
  • the valves 5i, 51 and 93 are preferably controlled by electromagnetlcally actuated pilot valves 15, 11 and 19, respectively.
  • the operation of the pilot valves 15, 11 and 19 are controlled by an auxiliary switch 9
  • pilot valves 15, 11 and 19 are provided, respectively.
  • actuating coils 91, 89 and' 9I.- 'I'hese coils ⁇ are adapted to be energized from a' suitable source of electrical potential indicated by the conductors 92 and 93.
  • is connected by'a conductor 95 to the potential or closing'stroke, shock absorbers, 'as shown at valve-5
  • is connected with the pressure tankV 5 through a conduit 53 and connects'with the cylinder" .by-Way of conduit 55. Closing movement of the m'ovable contact 25 is accomplished by admitting air under pressure from the tank 5 through the gontroi valve.
  • The'control valve 51 is similar to the vvalve struction having a rotatable drum, not shown, l
  • valve 53 is'connected to an outlet pipe 91 whichl connects withla manifold 59 having three outlet branches terminating, respectively, at the basesource 92.
  • the other side of coil 91 is connected by conductor 91 through terminals b--a of the auxiliary switch 9
  • pilot valve I1 for controlling the pilot valve I1 is yconnected by means of conductor H3 through the terminals dF-c of the auxiliary switch 4
  • of the pilot' valven19 is'connected by conductor
  • is of the usual concarried by the Vshaft ⁇
  • carries'a plurality-'ot ⁇ contact 'segments schematically shown in' Fig. i.
  • 29 will have moved from a position normally out of engagement to one of bridging engagement with the terminals g-h
  • will have moved from a position of engagement to one out of engagement with the terminals i-:i.
  • are in open circuit position.
  • the pilot valve 11 is opened, admitting air under pressure from the tank 5 to the upper end 'of the control valve 51 which causes the valve to open and admit air through conductor 5
  • the air thus admitted reacts against the piston 45, ⁇ driving it upwardly so as to actuate the rod 43 and the beam 4
  • 39 of the push-button switch Hi is depressed so as to connect the line 93 of the control potential source through conductor
  • 43 is raised permitting air to flow to the upper side of the piston
  • the operating cylinder 41 is provided with a latch
  • a gas blast circuit breaker separable contacts for establishing an arc, asource of gas under pressure, means for directing a blast of gas from said source against the arc to extinguish ⁇ the arc, operating means actuated by gas under pressure from said sourcefor moving said contacts4 to closed position, means for positively mechanically holding said contacts in the closed position, and said holding means being operated mechanically by thev pressure of said source 4for releasing said contact means to move to open position withI the pressure from said sourcefor releasing the ⁇ holding means applied prior to the application of tacts af-b so as to deenergize the coil 81 of the pilot valve 15.
  • push-button switch may be of any well known type used for the remote control of the electrical Aapparatus butv preferably is of the type'which assumes a neutral, position following the completion of the switchingV operation initially controlled by operation thereof.
  • which are controlled by the segments
  • 49 preferably shows a red signal when the breaker is'A in the closed circuit position, whereas the lamp
  • to the control potential source 92T' force to the moving contact tending to move it in opening direction.
  • a gas blast circuit breaker separable contacts for establishing an arc', a source of gas under pressure, a piston actuated by gas under'pressure from said source for moving said contacts to open and closed positions, means for holding said between said valve and'said vpiston operative to contacts in the closed position, a valve for admitting gas under pressure from said source to said piston to operate said contacts to open circuit position, and pressure responsive means'disposed release said holding means and admit gas to said piston only upon the delivery of gas by said valve ci. predetermined pressure.
  • 05 closes a i circuitl from the line 93 through the conductorV N3, and
  • Energiz'ation of the coil Il' causes' actuation of the pilot valve 15 in the manner previously described Vso as to effect operation of the contact structurev to the open circuit position as well as to cause an arc extinguishing blast of gas to flow lbetween the separating contacts and extinguish the arcs.
  • said resilientI means enabling said valve member to open in response to a flow of gas from said valve of Vpredetermined pressure, and means operable in response to movement of said valve member to the open position for releasing ⁇ said latching means to enable said piston to 4move said contacts to the open circuit position.
  • separable contacts for establishing an are, a source of gas under pressure, a piston actuated by gas under pressure .from said source'or moving said contacts to open and closed positions, means for latching said contacts in the closed position, a valve for admitting gas under, pressure from said source to said piston to operate said contacts to open circuit position, and a pressure responsive member v disposed between said Vvalveand said piston operative in response to gas at a predetermined pressure from said source to admit gas Vto said piston and to release said latching means, said. -pressure responsive member delaying release.
  • circuit interrupting means including a moving contact structure, a uid pressure-actuated piston for moving said contact structure to open and closed positions, a source of gas under pressure, a control valve arranged to admit gas under pressure from said source to said piston to operate said contact structure to open circuit position, a gas blast valve arranged to.admit an arc extinguishing blast from said source to said circuit interrupting means, electromagnetic means for controlling said valves, means for energizing said control means for operating said control and gas blast valves in the order named, means for positively mechanically holding said contact structure in the closed position, and pressure responsive means for releasing said holding means only when sufcient pressure exists at said source to extinguish the arc.
  • circuit interrupting means including a movingcontact structure, a iiuid pressure actuated piston for moving said contact structure to open and closed positions, a source of gas under pressure, means directing an arc-extinguishing blast from said source to said circuit interrupting means, a control valve operative to 'admit gas under pressure from said" source to said piston to operate said contact structure to the open circuit position, a pressure responsive valve between said control valve and said piston for controlling the iiow of gas to said piston, and means holding said contact structure in the closed position against movement to the open position until a predetermind pressure is available at said piston,
  • circuit interrupting means including a moving contact structure, a fluid pressure actuated piston for moving said contact structure to open and closed positions, a source of gas under pressure, means directing an arc-extinguishing blast from said source to said circuit interrupting means, a control valve operative to admit gas under pressure from said source to said piston to operate said contact; structure to the open circuit position, a pressure responsive valve betwwen said control valve and said piston for controlling the 'ilow of gas to said piston, latch means for normally holding said contact structure in the closed position against movement to the open position, and means actuated by said pressure responsive valve for releasing saidlatch means only when substantially full operating pressure is available at said piston to cause said piston to 'open said contact structure with a snap action.
  • a reservoir for storing gas under pressure ⁇ arranged to be maintained at ground potential
  • arc-extinguishing device including separable 'contacts, at least one of which is movable, means at least partially o! insulating material for insulatranged to permit movement of said movable *contact with respect thereto and with respect to said arc-extinguishing device.
  • a base structure including a tank at ground potential for storing gas under pressure, separable contacts, an arc chamber in which said contacts separate to establish the arc, means for insulating and supporting said arc chamber from said loase structureand tank including a conduit of insulating material for conducting gas from said tank to said arc chamber, a piston mounted at ground potential on said base structure and tank, an insulated operating rod extending from said piston to actuate said contacts, and control means also supported on said base structure and tank at ground potential for controlling the iiow of gas to said arc chamber and said piston.
  • a gas'blast circuit lnterrupter a base at ground potential, supporting means of insulating material eitending from said base; an arc chute, a contact and a terminal for the circuit interrupter connected to said contact all carried by said supporting means of insulating material and insulated from the base thereby; a second terminal for the circuit interrupter mounted on said supporting means of insulating material and ins'ulated thereby both from said base and from the iirst said contact and terminal, a movable contact connected to said second terminal and engageable with the rst said contact, and operating means at ground potential connected by means of insulating material to the movable contact, said operating means moving said movable contact through the arc chute from a position in engagement with the iirst said contact to a position out of the arc chute where there is a visible gap between the movable contact and the arc chute.
  • separable contacts for establishing arf arc, a source of gas under pressure, operating means actuated by gas under pressure from said source for moving said contacts to closed position, mechanical means for rigidly holding said contacts in the closed po. ⁇ sition. and means operated by gas pressure applied thereto from said source prior to the application of force to said contacts tending to separate them for mechanically releasing said holding means and permitting movement of the contacts to open position.
  • a source of gas under pressure including aA piston actuated by gas under pressure from said source i or moving-said contacts to closed position when pressure is applied to one side of said piston and for moving said contacts to open position when pressure is applied to the other side of said piston, mechanical means operableautomatically upon said contacts reaching closed position for rigidly holding said contacts in the closed position against any force applied to the contacts tending to move them to open position, and means operated by the gas pressure admitted from said source to the opening side of the piston for automatically mechanically releasing said holding means and permitting movement of the contacts to open position bythe gas pressure admitted to the opening side of the piston, and said means acting to begin the release of the holding means prior to the application of force to the contacts tending to move them inthe opening direction.

Landscapes

  • Circuit Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US313430A 1940-01-11 1940-01-11 Circuit interrupter Expired - Lifetime US2281042A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE483191D BE483191A (fr) 1940-01-11
US313430A US2281042A (en) 1940-01-11 1940-01-11 Circuit interrupter
GB286/41A GB544755A (en) 1940-01-11 1941-01-08 Improvements in or relating to electric circuit breakers of the gas blast type
CH218492D CH218492A (fr) 1940-01-11 1941-02-14 Interrupteur électrique.
FR943606D FR943606A (fr) 1940-01-11 1946-10-04 Perfectionnements aux appareils interrupteurs de circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US313430A US2281042A (en) 1940-01-11 1940-01-11 Circuit interrupter

Publications (1)

Publication Number Publication Date
US2281042A true US2281042A (en) 1942-04-28

Family

ID=23215659

Family Applications (1)

Application Number Title Priority Date Filing Date
US313430A Expired - Lifetime US2281042A (en) 1940-01-11 1940-01-11 Circuit interrupter

Country Status (5)

Country Link
US (1) US2281042A (fr)
BE (1) BE483191A (fr)
CH (1) CH218492A (fr)
FR (1) FR943606A (fr)
GB (1) GB544755A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542650A (en) * 1946-06-13 1951-02-20 Asea Ab Arrangement in electrical air blast circuit breakers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112635265B (zh) * 2021-01-08 2022-02-15 南通理工学院 一种火灾预警系统用快速跳闸高压断路器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542650A (en) * 1946-06-13 1951-02-20 Asea Ab Arrangement in electrical air blast circuit breakers

Also Published As

Publication number Publication date
FR943606A (fr) 1949-03-14
GB544755A (en) 1942-04-27
BE483191A (fr)
CH218492A (fr) 1941-12-15

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