US3683142A - Operating means for electric switching apparatus for high voltage - Google Patents

Operating means for electric switching apparatus for high voltage Download PDF

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Publication number
US3683142A
US3683142A US141174A US3683142DA US3683142A US 3683142 A US3683142 A US 3683142A US 141174 A US141174 A US 141174A US 3683142D A US3683142D A US 3683142DA US 3683142 A US3683142 A US 3683142A
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US
United States
Prior art keywords
rod
tension rod
piston
valve
lower piston
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
US141174A
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English (en)
Inventor
Par Arnholm
Per-Olof Grune
Tore Nygaard
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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
Application filed by ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US3683142A publication Critical patent/US3683142A/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
    • H01H33/42—Driving mechanisms

Definitions

  • ABSTRACT In an operating device for high voltage gas blast circuit breakers, the opening impulse is transmitted from earth to high potential by means of an insulating tension rod. A high initial acceleration of the rod is obtained by suddenly evacuating a pressurized cylinder space at earth potential through an electro-dynamically operated valve.
  • the present invention relates to a means for operating at least one contact in an electric switching device for high voltage and relates primarily to voltages in the order to 1,000 kilovolts.
  • the means is of the type in which a movement impulse is rapidly transferred from earth to high potential via a tension rod.
  • the object of the present invention is to effect an operating means which in the above respects is more suitable than corresponding previously known constructions.
  • the operating means comprises a pressurized gas valve placed in the vicinity of the contacts of the switching device at high potential, the movable valve member being controlled from earth potential by means of an insulated tension rod arranged inside a support insulator filled with compressed gas, the tension rod being joined to two pistons which are axially displaceable along cylindrical surfaces at the upper and lower ends of the rod, the upper side of the upper piston being in communication with the open air.
  • the invention is characterized in the lower side of the lower piston limits a cylindrical space which communicates through a narrow opening with the support insulator filled with pressurized gas and can be connected through a high speed evacuation valve to the open air to operate the contact.
  • the device according to the invention can be designed so that at least two pneumatic valves at high potential are arranged to be influenced by a number of cams supported by the tension rod. Suitable time delay between the release impulses to the various contacts can thus easily be adjusted by attaching the cams to the rod in such a way that the distance between them can be altered.
  • FIG. 1 shows the principle for transmission of the release impulses from earth to high potential
  • FIG. 2 shows the operating member arranged at earth potential in closer detail.
  • FIG. 1 shows schematically two pneumatic valves 1 and 2 placed at high potential and intended to emit power impulses to a power contact and a resistor contact, respectively, in an electric switching device, for example an air balst circuit breaker. Release of the contacts is effected by opening the valves 1 and 2 so that two conduits 3 and 4 are placed under pressure from a hollow support insulator 5 filled with pres surized gas, which is fed by a conduit 6 from source of pressurized gas arranged at earth potential.
  • the valves 1 and 2 are influenced by two cams 7 and 8 which are attached to a vertical tension rod 9 of insulating material arranged inside the support insulator 5, which rod is provided at its upper end with a piston 10 and at its lower end with a piston 11 having a larger diameter than the piston 10.
  • the pistons are axially displaceable along cylindrical surfaces 12 and 13 at the upper and lower ends of the rod. Between the pistons and the cylindrical surfaces are sealing rings.
  • the lower side of the lower piston 11 limits a cylindrical space 14, which is in communication with the support insulator 5 filled with pressurized gas through a leakage hole 15 in the piston 11, so that the cylindrical space 14 is under pressure during normal operation.
  • the cylindrical space 14 can be placed in communication with the open air through an electro-dynarnically controlled pressurized gas valve 16.
  • the design of the pressurized gas valve 16 is clear from FIG. 2.
  • the required sealing pressure is effected by pressurized gas being supplied to a space 17 on the lower side of the valve plate 18.
  • the valve is operated by discharging a capacitor, which is charged in advance, through an induction coil 19 so that a current is induced in a short circuiting ring 20 arranged in the valve plate.
  • the valve plate is pushed away from its seat with considerable force.
  • the pressurized gas in the cylindrical space 14 will operate over a greater surface of the valve plate 18, thus contributing to a shortened opening time of the valve.
  • Closing of the valve iseffected by supplying pressurized gas to a cylindrical space on the lower side of a return piston 21.
  • the tension rod 9 and evacuation valve 16 are shown in normal position, the pressure p, in the cylinder space 14. being equal to the pressure p, in the support insulator 5.
  • the same pressure thus prevails on both sides of the lower piston 11, and the upper piston will keep the rod in its upper position, pressed against resilient stops 22 by a force F I which, apart from the relatively slight gravity which influences the rod and pistons, is equal to p,, A,, where A, designates the area of the piston 10.
  • the valve 16 opens and the cylindrical space 14 is evacuated.
  • the tension rod 9 is thus moved down under the influence of a force F, (p, .p,)A,- p.- A, where A, designates the area of the piston 11.
  • valve 1 During the downward movement of the rod the valve 1 is first actuated and then the valve 2, thus operating the power and resistor contacts, respectively, of the switching device.
  • the evacuation valve 16 is then returned automatically to its normal position by admitting air below piston 21, the pressure on both sides of the piston 11 is equalized through the leakage hole and the tension rod returns to'its upper position under the influence of the force F p,
  • Means for operating at least one contact in an electric switching device for high voltage comprising a 15 pneumatic valve I) placed at high potential, a hollow support insulator (5) adapted to be filled with compressed gas carrying said pneumatic valve at its upper end, an insulating tension rod (9) movable upward and downward within said support insulator, means forming cylindrical surfaces (l2, 13) adjacent the top and bottom of said support insulator, upper and lower pistons 10, ll) connected to said tension rod and slidable said cylindrical surfaces, the top surface of the upper piston being exposed to atmospheric pressure, an
  • Means as claimed in claim 1 having a wall adjacent and above the lower piston having an opening therethrough of substantially greater cross-section than the cross-section of the tension rod, the tension rod passing through the hole, and an enlargement carried by the tension rod and movable into the hole during downward movement of the rod to throttle the flow of gas from the interior of the support insulator into the space above the lower piston.
  • Means as claimed in claim 1 having means forming an outflow chamber on the outlet side of the evacuation valve having a throttled outlet to atmospheric pressure.

Landscapes

  • Actuator (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Circuit Breakers (AREA)
US141174A 1970-05-27 1971-05-07 Operating means for electric switching apparatus for high voltage Expired - Lifetime US3683142A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7251/70A SE342354B (en, 2012) 1970-05-27 1970-05-27

Publications (1)

Publication Number Publication Date
US3683142A true US3683142A (en) 1972-08-08

Family

ID=20270862

Family Applications (1)

Application Number Title Priority Date Filing Date
US141174A Expired - Lifetime US3683142A (en) 1970-05-27 1971-05-07 Operating means for electric switching apparatus for high voltage

Country Status (5)

Country Link
US (1) US3683142A (en, 2012)
CA (1) CA935481A (en, 2012)
CH (1) CH525551A (en, 2012)
DE (1) DE2125569B2 (en, 2012)
SE (1) SE342354B (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114242474A (zh) * 2021-12-23 2022-03-25 广东电网有限责任公司江门供电局 一种高低压绝缘操作棒

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3732004A1 (de) * 1987-09-23 1989-04-06 Asea Brown Boveri Hochspannungs-trennschalter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2238567A (en) * 1940-01-19 1941-04-15 Gen Electric Circuit breaker
US3076081A (en) * 1961-05-22 1963-01-29 Gen Electric Condition-responsive indicating means for an electric circuit breaker
US3256414A (en) * 1962-03-30 1966-06-14 Bbc Brown Boveri & Cie Operating mechanism for electrical circuit breaker of the gas blast type
US3270174A (en) * 1964-10-07 1966-08-30 Hitachi Ltd Operating mechanisms of air-filled airbreak circuit breakers
US3336454A (en) * 1964-12-29 1967-08-15 Gen Electric Means for controlling the blast valve of a gas blast circuit breaker
US3420972A (en) * 1965-06-01 1969-01-07 Asea Ab High voltage gas blast circuit breaker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2238567A (en) * 1940-01-19 1941-04-15 Gen Electric Circuit breaker
US3076081A (en) * 1961-05-22 1963-01-29 Gen Electric Condition-responsive indicating means for an electric circuit breaker
US3256414A (en) * 1962-03-30 1966-06-14 Bbc Brown Boveri & Cie Operating mechanism for electrical circuit breaker of the gas blast type
US3270174A (en) * 1964-10-07 1966-08-30 Hitachi Ltd Operating mechanisms of air-filled airbreak circuit breakers
US3336454A (en) * 1964-12-29 1967-08-15 Gen Electric Means for controlling the blast valve of a gas blast circuit breaker
US3420972A (en) * 1965-06-01 1969-01-07 Asea Ab High voltage gas blast circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114242474A (zh) * 2021-12-23 2022-03-25 广东电网有限责任公司江门供电局 一种高低压绝缘操作棒

Also Published As

Publication number Publication date
DE2125569B2 (de) 1973-10-18
CA935481A (en) 1973-10-16
SE342354B (en, 2012) 1972-01-31
DE2125569A1 (de) 1971-12-02
CH525551A (de) 1972-07-15

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