US3832502A - Electric circuit breaker with hydraulic actuating means including a plurality of valves for opening the breaker,and a plurality of valves for closing the breaker - Google Patents

Electric circuit breaker with hydraulic actuating means including a plurality of valves for opening the breaker,and a plurality of valves for closing the breaker Download PDF

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Publication number
US3832502A
US3832502A US00257151A US25715172A US3832502A US 3832502 A US3832502 A US 3832502A US 00257151 A US00257151 A US 00257151A US 25715172 A US25715172 A US 25715172A US 3832502 A US3832502 A US 3832502A
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US
United States
Prior art keywords
valve
breaker
hydraulic
valves
circuit breaker
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
US00257151A
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English (en)
Inventor
G Grieger
J Bohrdt
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
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 claimed from DE19712128648 external-priority patent/DE2128648C3/de
Application filed by Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3832502A publication Critical patent/US3832502A/en
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
    • H01H33/34—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator hydraulic
    • 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
    • H01H2033/308—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator comprising control and pilot valves

Definitions

  • An electric circuit breaker having a blast piston for compressing a gaseous quenching medium such as sulfur hexaflouride, and a hydraulic drive for the breaker which includes a main hydraulic actuator cylinder and piston and valves for controlling the admission of hydraulic fluid into the cylinder.
  • a gaseous quenching medium such as sulfur hexaflouride
  • a hydraulic latching arrangement for closing the circuit breaker a hydraulic latching arrangement is discosed which is associated with the valve closest to the main actuator cylinder in an application where there are more than two seriesconnected valves for closing the breaker.
  • a hydraulic latching arrangement for opening the breaker, which is associated with a valve which is separated from the main actuator cylinder by at least one further valve.
  • the choke permits the main valve to be reversed by the other servo valve for opening the circuit breaker without an unnecessarily large loss of oil.
  • the discharge crosssection of the servo valve through which the piston is relieved for the operation of the valve must be larger than the cross-section constricted by the choke through which the hydraulic fluid can flow into the piston.
  • Other objects of this invention are referred to below.
  • a circuit breaker according to this invention having more than two series-connected valves for closthe closing is associated with the valve closest to the main hydraulic actuator cylinder, and a hydraulic latching arrangement for the opening is associated with a valve which is separated from the cylinder by at least one further valve.
  • the hydraulic drive of the circuit breaker according to the invention can also be entrusted with a task which heretofore was accomplished by electrical interlock devices.
  • the valve series provided for the opening is connected to the hydraulic line used for the latching arrangement for the closing. In this manner an opening command can be transmitted hydraulically only if the circuit breaker is actually closed.
  • valve preceding the valve with the latching arrangement for closing can be shut off by a check valve
  • the valve provided with the closing latching arrangement is a two-three-way valve which is associated with the larger piston surface of'a differential piston while the smaller piston surface of the differential piston is continuously acted upon by hydraulic fluid.
  • the stroke of the two-three-way valve is preferably larger for the opening of its inlet than for the closing of its outlet, so that unnecessary losses of hydraulic fluid are avoided.
  • the high-voltage power circuit breaker 1 is operated by a hydraulic actuator 2.
  • the high-voltage circuit breaker 1 may be designed for a rated voltage of l 10 kilovolts or more, and a flow of sulfur hexafluoride gas (SF,,) for quenching any electrical are formed between the electrical breaker contacts at the moment of switching is provided by means of a blast piston coupled with the movable contact 5, a considerable and reliable driving force must be provided for the device, especially for the opening of the breaker contacts.
  • the hydraulic actuator 2 includes an actuator cylinder 3 with a differential piston 4 contained therein which is coupled by means of an insulating linkage 6 with the movable contact of the circuit breaker.
  • Hydraulic fluid such as oil for operating the circuit breaker comes from a hydraulic accumulator 10 in which the fluid is kept under a suitable pressure (for instance, 200 atmg) by means of gas in known manner.
  • a pressure line 12 Connected to the outlet 11 of the hydraulic accumulator is a pressure line 12 which leads directly to a main valve 13 interposed before the main hydraulic actuator 2 for the circuit breaker 1.
  • the main valve 13 has a passage 16 by means of which the portion of the actuator cylinder 3 associated with the smaller piston surface 18 of the differential piston 4 of the hydraulic actuator 2 is continuously acted upon by hydraulic fluid through a hydraulic line 19 extending from the main valve 13.
  • the larger piston surface 20 of the differential piston 4 within the main hydraulic cylinder 3 is connected through a hydraulic line 21 to a chamber 23 of the main valve 13 which is adapted to be shut off by a valve head 24 from the passage 16 communicating with pressure line 12 and the accumulator 10.
  • This valve head 24 is spring-biased by a spring 25 which resiliently presses the valve head 24 against a valve seat 27.
  • a stem 29 is provided which is movably received within a recess 30 in the valve head 24.
  • This stem 29 is an integral extension of the main valves actuator piston 31.
  • the actuator piston 31 is guided within a cylinder 32.
  • the stem 29 At the portion of the stem 29 extending toward the piston 31, the stem widens and forms a cylindrical valve member 33 which serves as a slider and cooperates with a recess 34 in the cylinder such that the hydraulic connection between chamber 23 and outlet 36 of the main valve can be closed off.
  • a series of valves 39, 47, 65
  • another series of valves 38, 46, 13
  • the two valve series being to some extent of similar design.
  • the two valve series each include a servo valve 38, 39 with an associated electro-magnct 40, 41 for electrical operation thereof.
  • the servo valve 38 for the closing process is connected to the pressure line 12 by means of a hydraulic line 42
  • the servo valve 39 for the opening process is connected by a hydraulic line 43 to a hydraulic line 44 which opens into chamber 23 of the main valve 13.
  • the two servo valves 38, 39 are each followed by an associated control valve 46, 47 which is operated hydraulically.
  • the control valve 46 for the closing process is connected by means of a hydraulic line 50 with the pressure line 12, while the control valve 47 for the opening process is connected by means of a hydraulic line 51 to hydraulic line 43.
  • the respective actuator pistons 53, 54 of the control valves 46, 47 are each adapted to be acted upon by hydraulic fluid through their respective servo valves 38, 39 through respective hydraulic connecting lines 55, 56.
  • the actuator pistons 53, 54 of the control valves 46, 47 are relieved by means of hydraulic lines 100 and 101 respectively.
  • a hydraulic line having a check valve leads to the inlet 61 of the cylinder 32 for the actuating piston 31 of the main valve 13.
  • this inlet 61 is hydraulically connected with hydraulic line 44 as well as to a valve 65 which is operated by means of a piston 66.
  • Valve 65 connects the part of the cylinder 32 of the main valve associated with the larger area of the main valvcs actuator piston 31 with an oil tank 62.
  • the length of the stem 29 has a predetermined relationship to that of the recess 30 in valve head 24 and to the distance between the valve seat 34 and the slider cylinder 33 such that outlet 36 of the main valve is closed off shortly after the actuator piston 31 moves from right to left. Thereafter, the valve head 24 of the main valve 13 is lifted from the valve seat 27, and the hydraulic fluid present at valve inlet 16 is thereby permitted to flow into a hydraulic line 21 extending to cylinder 3 of the main hydraulic actuator 2 with the result that the circuit breaker closes.
  • servo valve 39 is opened by an energization of electro-magnet 41 in a known manner.
  • hydraulic fluid is permitted to flow through hydraulic lines 44, 43 and 56 to control valve 47, and from there through hydraulic lines and 71 to valve 65.
  • inlet 61 of the main valve is hydraulically connected with the oil tank 62.
  • suitable dimensioning of the outlet cross-section in relation to hydraulic line 44 which serves as the feed line and in which a choke 103 can be arranged there is rapid pressure relief of the piston 31 in the main valve with'the result that spring 25 together with the force of the hydraulic fluid acting on the piston closes the main valve at valve seat 27.
  • the large piston surface 20 of the differential piston 4 is then pressure-relieved rapidly and reliably by the opening of outlet 36 into an oil tank. Thereby, the pressure of the hydraulic fluid acting continuously on the small piston surface 18 of the differential piston 4 brings the circuit breaker l reliably into the open position.
  • the hydraulic latching for the closing operation is due to hydraulic line 44, and the latching arrangement is consequently located directly at the main valve 13.
  • the hydraulic latching for the opening operation is provided by hydraulic lines 51 and 71. It is accordingly possible with the described invention to initiate the opening operation without having to actuate the main valve 13 itself. As a result the closing operation starts only when the closing command is executed with certainty, while the opening command can be given to the drive mechanism even when there is an existing closing command. Therefore, the opening command, which is important for the safety of the circuit breaker. is executed with priority in spite of hydraulic latching for the closing operation. The opening command remains in the latched condition as long as overpressure exists in hydraulic lines 44, 43, 51 and 56.
  • the latching arrangement for the closing is associated with the valve 13 closest to the cylinder 3 of the hydraulic actuator 2, and that a hydraulic latching arrangement 71 is also provided for the opening.
  • the latching arrangement for the opening is associated with a valve 47 which is separated by valve 65 from the cylinder 3 of the hydraulic actuator 2. It will also be noted that the valves 39 47, 65 provided for the opening are connected to the hydraulic line 44 which is used for the latching arrangement for the closing.
  • the circuit breaker for use with hydraulic fluid and with a blast piston for compressing a gaseous quenching medium.
  • the circuit breaker having a main hydraulic actuator. a plurality of valves for closing the breaker. and a plurality of valves for opening the breaker.
  • the improvement comprising means for hydraulically latching the circuit breaker upon its closing, which means is connected to the one of the valves for closing the breaker which is hydraulically closest to the main hydraulic actuator;
  • a main valve having a hydraulic connection to said oil tank and a hydraulic connection to the hydraulic actuator.
  • valves for opening are hydraulically connected in series and wherein the valves for closing are hydraulically connected in series.
  • An electric circuit breaker as in claim 1 wherein the means for latching the circuit breaker upon its closing includes a hydraulic line between the main valve and said one of the valves for closing.
  • An electric circuit breaker as in claim 3 wherein said hydraulic line has a check valve therein for shutting off said one of the valves for closing.
  • the hydraulic actuator includes a differential piston with its larger piston surface having a hydraulic connection to said two-three-way valve, and'its smaller piston surface being continuously acted upon by hydraulic fluid.
  • An electric circuit breaker as in claim 6 further comprising the oil tank being hydraulically connected to an outlet of said two-three-way valve and wherein the stroke of said two-three-way valve for opening its said hydraulic connection to said differential piston is larger than the stroke of said two-three-way valve for closing its said outlet to said oil tank.
  • an electric circuit breaker for use with hydraulic fluid and with a blast piston for compressing a gaseous quenching medium
  • the circuit breaker having a main hydraulic actuator, a plurality of valves for closing the breaker, and a plurality of valves for opening the breaker.
  • the improvement comprising means for hydraulically latching the breaker upon its closing, which means is connected to the one of the valves for closing the breaker which is hydraulically closest to the main hydraulic actuator;
  • a main valve having a hydraulic connection to said oil tank and a hydraulic connection to the hydraulic actuator
  • hydraulic actuator includes a differential piston with its larger piston surface having a hydraulic connection to the main valve and its smaller piston surface being continuously acted upon by the hydraulic fluid.
  • main valve comprises a two-three-way valve in which the stroke of the piston for opening its said hydraulic connection to the differential piston is larger than the stroke of the piston for closing its said hydraulic connection to said oil tank.
  • said two-three-way valve comprises a spring-biased valve head with a recess therein, said valve head being within a chamber in said twothree-way valve;
  • said piston within said two-three-way valve.
  • said piston having a stem portion adapted to be received into the recess in said valve head for moving said valve head in a direction opposite to the spring-bias of said valve head.
  • An electric circuit breaker as in claim 9 which further comprises a moveable contact for opening and closing the circuit in which the breaker is interposed;
  • valves for closing the breaker and the valves for opening the breaker each include an electromagnetically actuated servo valve.

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  • Fluid-Pressure Circuits (AREA)
  • Circuit Breakers (AREA)
US00257151A 1971-06-04 1972-05-26 Electric circuit breaker with hydraulic actuating means including a plurality of valves for opening the breaker,and a plurality of valves for closing the breaker Expired - Lifetime US3832502A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712128648 DE2128648C3 (de) 1971-06-04 Hydraulischer Antrieb für einen Hochspannungs-Leistungsschalter

Publications (1)

Publication Number Publication Date
US3832502A true US3832502A (en) 1974-08-27

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ID=5810306

Family Applications (1)

Application Number Title Priority Date Filing Date
US00257151A Expired - Lifetime US3832502A (en) 1971-06-04 1972-05-26 Electric circuit breaker with hydraulic actuating means including a plurality of valves for opening the breaker,and a plurality of valves for closing the breaker

Country Status (4)

Country Link
US (1) US3832502A (enrdf_load_stackoverflow)
JP (1) JPS5328622B1 (enrdf_load_stackoverflow)
CH (1) CH539940A (enrdf_load_stackoverflow)
FR (1) FR2139894B1 (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969985A (en) * 1972-07-12 1976-07-20 Siemens Aktiengesellschaft Fluid actuating device for an electric circuit breaker
DE3048814A1 (de) * 1979-12-27 1981-09-24 Hitachi, Ltd., Tokyo Hydraulische betaetigungseinrichtung
US4321435A (en) * 1972-07-13 1982-03-23 Siemens Aktiengesellschaft Fluid actuating device for an electric circuit breaker
US4343972A (en) * 1979-11-01 1982-08-10 Bbc Brown, Boveri & Company, Ltd. Hydraulic drive for electrical switches
US4443195A (en) * 1980-05-22 1984-04-17 Kabushiki Kaisha Morita Seisakusho Driving and water pouring control device for dental air-turbine handpiece
US4461937A (en) * 1981-09-18 1984-07-24 Mcgraw-Edison Company Fail-safe hydraulically operated circuit breaker accumulator arrangement
US4730092A (en) * 1985-12-20 1988-03-08 Siemens Aktiengesellschaft Hydraulic driving device for an electric pressurized-gas switch
CN1034145C (zh) * 1993-07-29 1997-02-26 浙江大学 高压断路器的液压操动机构
US5804787A (en) * 1995-11-20 1998-09-08 Hitachi, Ltd. Gas circuit breaker and liquid pressure-driving system to be used therefor
US20030213774A1 (en) * 2002-05-17 2003-11-20 Hitachi, Ltd. Hydraulic pressure actuating apparatus for circuit breaker

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2233516A2 (en) * 1973-06-14 1975-01-10 Comp Generale Electricite Fluid press. control valve assembly - has three pistons on single shaft and pilot valve to control fluid flow
JPS6028082B2 (ja) * 1977-07-20 1985-07-03 株式会社日立製作所 流体圧駆動装置
FR2422245A1 (fr) * 1978-01-04 1979-11-02 Gratzmuller Claude Systeme de commande hydraulique pour disjoncteurs electriques

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969985A (en) * 1972-07-12 1976-07-20 Siemens Aktiengesellschaft Fluid actuating device for an electric circuit breaker
US4321435A (en) * 1972-07-13 1982-03-23 Siemens Aktiengesellschaft Fluid actuating device for an electric circuit breaker
US4343972A (en) * 1979-11-01 1982-08-10 Bbc Brown, Boveri & Company, Ltd. Hydraulic drive for electrical switches
DE3048814A1 (de) * 1979-12-27 1981-09-24 Hitachi, Ltd., Tokyo Hydraulische betaetigungseinrichtung
US4443195A (en) * 1980-05-22 1984-04-17 Kabushiki Kaisha Morita Seisakusho Driving and water pouring control device for dental air-turbine handpiece
US4461937A (en) * 1981-09-18 1984-07-24 Mcgraw-Edison Company Fail-safe hydraulically operated circuit breaker accumulator arrangement
US4730092A (en) * 1985-12-20 1988-03-08 Siemens Aktiengesellschaft Hydraulic driving device for an electric pressurized-gas switch
CN1034145C (zh) * 1993-07-29 1997-02-26 浙江大学 高压断路器的液压操动机构
US5804787A (en) * 1995-11-20 1998-09-08 Hitachi, Ltd. Gas circuit breaker and liquid pressure-driving system to be used therefor
US20030213774A1 (en) * 2002-05-17 2003-11-20 Hitachi, Ltd. Hydraulic pressure actuating apparatus for circuit breaker
US6815629B2 (en) * 2002-05-17 2004-11-09 Hitachi, Ltd. Hydraulic pressure actuating apparatus for circuit breaker

Also Published As

Publication number Publication date
FR2139894A1 (enrdf_load_stackoverflow) 1973-01-12
JPS5328622B1 (enrdf_load_stackoverflow) 1978-08-16
FR2139894B1 (enrdf_load_stackoverflow) 1980-03-14
CH539940A (de) 1973-07-31
DE2128648A1 (de) 1972-12-14
DE2128648B2 (de) 1976-05-20

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