US3480751A - Arrangement for pressure-gas switch operating with closed gas circuit and with sf6 as the arc extinguishing medium - Google Patents

Arrangement for pressure-gas switch operating with closed gas circuit and with sf6 as the arc extinguishing medium Download PDF

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Publication number
US3480751A
US3480751A US579887A US3480751DA US3480751A US 3480751 A US3480751 A US 3480751A US 579887 A US579887 A US 579887A US 3480751D A US3480751D A US 3480751DA US 3480751 A US3480751 A US 3480751A
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United States
Prior art keywords
gas
insulator
switch
pressure
arc extinguishing
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Expired - Lifetime
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US579887A
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English (en)
Inventor
Egbertus Adrianus Frowein
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BBC Brown Boveri AG Germany
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Bbc Brown Boveri & Cie
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Publication date
Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
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Publication of US3480751A publication Critical patent/US3480751A/en
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    • 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
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • 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
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring

Definitions

  • a circuit breaker of the gas blast type utilizes sulphur hexafluoride (SP6) as the gaseous arc extinguishing medium and the ⁇ gas flows in a ⁇ closed circuit rather than being exhausted to atmosphere.
  • SP6 sulphur hexafluoride
  • ⁇ Contaminated switch gases which ow from the switch chamber pass through a hollow insulator which connects the switch chamber, which is at high potential, with a collecting vessel which is at earth potential.
  • the contaminated gases are passed through a plurality of concentric and longitudinally overslapping metallic tubes located inside the insulator which keep them out of Contact with the inner wall of the hollow insulator, and clean SP6 gas is also passed through the insulator between it and the concentric, overlapping tubes as well as between the tubes to further screen the inner wall of the insulator from the contaminated gases.
  • This invention concerns a gas-blast circuit breaker using sulphur hexafluorid-e (SP6) as arc extinguishing medium and having a closed gas cycle or circuit wherein the switch gases, on switching taking place, flow out of a switch chamber that is under voltage into a collecting vessel.
  • SP6 sulphur hexafluorid-e
  • a gas-blast circuit breaker with a closed gas circuit and with SP6 as arc extinguishing medium in which the switch gases flow into a collecting vessel through the hollow conductor of a lead-in, said collecting vessel being mounted on the end of the lead-in and carrying high Voltage. Prom there the gases pass via an insulated line and a compressor, back into the high pressure container of the circuit breaker,
  • the disadvantage with this is that it is diicult to mount the collecting vessel, which takes up a considerable amount of space, and, since it is currentconductive, this leads to unmanageable dimensions of the whole switch. This disadvantage is particularly evident when it is desired to use a tank type construction.
  • the known arrangement has the disadvantage that the products arising from the extinguishing gas and from the evaporated contact material under the effect of the electric arc are in part chemically aggressive, and attack the surface of the insulating tube, with the result that a conductive layer is produced. Again, very iine pulverulent compounds also occur, which deposit themselves on the surface of the insulating tube. Even with very slight amounts of dampness, there is hydrolysis of these compounds, with the result again that a conductive layer occurs, which leads to a breakdown of the insulation.
  • the object of this invention is to arrange the collecting vessel in such a way that the dimensions of the circuit breaker can be kept small, and to keep away from the insulator through which the gases flow, the injurious effeet of the switch gas with its attendant contaminating compounds.
  • a gas-blast circuit 3,480,751 Patented Nov. 25, 1969 breaker is provided having sulphur hexauoride as arcextinguishing medium in a closed gas circuit, and including a switching chamber which in operation is live, i.e.
  • a gas collecting vessel which is earthed
  • an insulating member connecting the switching chamber to the said vessel for conveying the arc-extinguishing medium from the chamber to the Vessel on opening of the circuit breaker
  • a metal tube in and spaced from the insulating member to serve as a protective shield
  • a check valve between the vessel and the interior of the insulating member, and means for directing a flow of clean sulphur hexafluoride through the space between the insulating member and the protective shield whenever the circuit breaker is opened and prior to the separation of the circuit breaker contacts.
  • 1 designates the switch chamber which is filled with high pressure gas, and in which is located a tube-shaped blast-valve member 2 which has a ringshaped drive piston 3.
  • the said valve member is inserted in the cylinder 4 and is held in the closed position by a sprng ⁇ 5.
  • pressurized gas i.e. SP6
  • SP6 pressurized gas
  • the bridging contact 7 in the rest position ensures that there is good electrical connection between the movable contact 8 and the fixed contact 9.
  • Both contacts 8, 9 are located inside the blast valve member 2, arranged concentrically thereto, and are of hollow construction. In the rest position the contact 8 is held in its position by a return spring 10. On opening of the contacts, after a certain lift of the blast valve member 2 from its seat 2b, the contact 8 is carried along by the latter, as soon as the left-hand interior abutment 2a impinges on the outer collar 8a of the Contact.
  • An elbow pipe 11 is used for holding the fixed contact 9, and its flange 11a supports the switch chamber 1. It has an annular channel 12 which, in the rest position of the blast Valve member 2, is sealed from the switch chamber 1. At its other end annular channel 12 opens into the space 13 in the interior of an insulator 14.
  • the latter forms the insulation between the voltage carrying switch chamber 1 and a casing 1S which is earthed and iilled with the SP6 gas at low pressure.
  • the lower armature 14a of the insulator is flange-shaped and fixed to the connecting piece 15a1, to which the collecting vessel 16 is also iixed.
  • the elbow pipe 11 is continued in the interior of the insulator 14 by a metallic protective tube 17.
  • Tube 17 is concentrically surrounded by a further metallic protective tube 18, which is, however, held by means of a tubular insulating piece 19, the tube 18 also acting as a field control electrode between the voltage-carrying inner tube 17 and an outer, earthed tube Z0.
  • the insulating piece 19 also connects the outer tube 20 with the tube 18.
  • the tubes 17, 18, 20 overlap in the axial direction and screen i.e. protect the insulating piece 19 by excluding the contaminating, discharge gas products from contact with the inner wall surface of the tubular insulator 19.
  • the interior wall surface of the tubular insulator 14 is thereby also protected i.e. screened from the embodying switch gases.
  • the insulating piece 19 has wall bores 21 through which the space 13 is connected with the annular spaces between the tubes 17, 18 and 18, 20.
  • the outer tube 2.0 ⁇ at its lower end is closed olf from the collecting vessel 16, in the rest position, by a check valve 22, which is under the influence of a weak closure spring 23.
  • the method of operation is as follows:
  • pressurized SP6 gas is introduced at inlet 6, and acts on the drive piston 3 of the blast valve member 2, moving the latter to the left against the counter pressure of spring 5.
  • the blast valve member 2 is lifted from its seat and permits the passage of the pressurized gas from the chamber 1 via the annular channel 12 into the space 13, putting this under pressure.
  • the left-hand interior abutment 2a meetspthe outer collar 8a of the movable contact 8 and in this way entrains the contact.
  • the contacts 8, 9 are now separated and the arc occurring between them is, in the known way,l blown with the SP6 gas and finally extinguished.
  • the switch gases meanwhile flow through the contact 9 and reach the collecting vessel 16 via the elbow pipe 11 and v tubei17, the check valve 22 having opened.
  • the switch gases are screened from i.e. prevented from coming into contact with, the interior wall of the insulator 14 by the fact that tube 17 projects into the insulator 14, tubes 17, 18 and 20 overlap, and the space 13 is already filled with pressurized gas in essentially pure state before the discharge gases start to ow.
  • the overlapping of the tubes 17, 18, 20 also prevents direct impingement of the exhaust gas jet on the wall of the insulator 19. However, in order to keep the gas as pure as possible in the spaces between the tubes 17, 18, 20, the spaces are scoured with fresh SP6 gas from space 13, via the bores 21.
  • the cylindrical space to the right of the drive piston 3 of the blast valve member 2 is vented at 6, so that the Valve member again moves into the closed position under the effect of the spring 5, and the return spring 10 re-closes contacts 8 and 9.
  • the exhaust process thereby ceases.
  • There is still a short ushing process which concludes when the blast valve member 2 also shortly thereafter closes, and the space 13 drops to the low pressure via the bores 21.
  • the power contacts 8, 9 open only for a brief period.
  • a voltage isolator is arranged in series with the power contacts, opening before the closing of the said power contacts and taking over the isolation in the open position of the circuit breaker.
  • the advantage of the new arrangement consists above all in that the contaminated switch gases can be stored in the collecting vessel, which is earthed and therefore at all times accessible, until the fine, pulverulent impurities have deposited.
  • the SP6 gas is finally returned in known manner through a filter and compressor into the high pressure chamber.
  • the check valve prevents the contaminated switch gases from being able to flow back into the insulator spaces after opening of the contacts.
  • a gas blast circuit breaker comprising means forming a high potential switch chamber, a pair of separable contacts located within said switch chamber, at least one of said contacts being tubular and stationary, means including a blast valve for introducing clean and pressurized sulphur hexafiuoride gas into said switch chamber for effecting separation of said contacts, a blast valve for introducing clean and pressurized sulphur hexafiuoride gas into said switch chamber for effecting separation of said contacts, a blast valve for introducing clean and pressurized sulphur hexafiuoride gas into said switch chamber for effecting separation of said contacts, a blast valve for introducing clean and pressurized sulphur hexafiuoride gas into said switch chamber for effecting separation of said contacts, a blast valve for introducing clean and pressurized sulphur hexafiuoride gas into said switch chamber for effecting separation of said contacts, a blast valve for introducing clean and pressurized sulphur

Landscapes

  • Circuit Breakers (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US579887A 1965-10-08 1966-09-16 Arrangement for pressure-gas switch operating with closed gas circuit and with sf6 as the arc extinguishing medium Expired - Lifetime US3480751A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1391465A CH425950A (de) 1965-10-08 1965-10-08 Einrichtung für Druckgasschalter mit SF6 als Löschmittel und mit geschlossenem Gaskreislauf

Publications (1)

Publication Number Publication Date
US3480751A true US3480751A (en) 1969-11-25

Family

ID=4396431

Family Applications (1)

Application Number Title Priority Date Filing Date
US579887A Expired - Lifetime US3480751A (en) 1965-10-08 1966-09-16 Arrangement for pressure-gas switch operating with closed gas circuit and with sf6 as the arc extinguishing medium

Country Status (6)

Country Link
US (1) US3480751A (enrdf_load_stackoverflow)
CH (1) CH425950A (enrdf_load_stackoverflow)
DE (2) DE1223439B (enrdf_load_stackoverflow)
FR (1) FR1495895A (enrdf_load_stackoverflow)
GB (1) GB1089688A (enrdf_load_stackoverflow)
SE (1) SE304785B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773994A (en) * 1972-06-30 1973-11-20 Gen Electric Double-exhaust gas-blast circuit breaker

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2108560A (en) * 1933-10-20 1938-02-15 Westinghouse Electric & Mfg Co Circuit breaker
US2364981A (en) * 1942-05-16 1944-12-12 Allis Chalmers Mfg Co Electric circuit breaker and method of operating the same
US2365509A (en) * 1941-11-26 1944-12-19 Westinghouse Electric & Mfg Co Circuit interrupting device
US2913626A (en) * 1957-10-04 1959-11-17 Bbc Brown Boveri & Cie Multiple spark gap arrangement for lighining arresters
US2955182A (en) * 1957-06-21 1960-10-04 Ite Circuit Breaker Ltd Contact cooling means for recirculating gas blast interrupters
US3339046A (en) * 1964-05-25 1967-08-29 Bbc Brown Boveri & Cie Blast valve arrangement for compressed gas operated circuit breakers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE628853C (de) * 1933-10-20 1936-04-17 Siemens Schuckertwerke Akt Ges Schalter mit Mehrfachunterbrechung und Lichtbogenloeschung durch eine im Kreislauf bewegte und wiederholt zum Loeschen benutzte Gas- oder Dampfmenge
DE629247C (de) * 1934-02-21 1936-04-25 Siemens Schuckertwerke Akt Ges Schalter mit Lichtbogenloeschung durch eine im Kreislauf bewegte und wiederholt zum Loeschen benutzte Gas- oder Dampfmenge
DE633818C (de) * 1934-05-10 1936-08-07 Siemens Schuckertwerke Akt Ges Schalter mit Lichtbogenloeschung durch ein stroemendes bzw. expandierendes gas- oder dampffoermiges Loeschmittel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2108560A (en) * 1933-10-20 1938-02-15 Westinghouse Electric & Mfg Co Circuit breaker
US2365509A (en) * 1941-11-26 1944-12-19 Westinghouse Electric & Mfg Co Circuit interrupting device
US2364981A (en) * 1942-05-16 1944-12-12 Allis Chalmers Mfg Co Electric circuit breaker and method of operating the same
US2955182A (en) * 1957-06-21 1960-10-04 Ite Circuit Breaker Ltd Contact cooling means for recirculating gas blast interrupters
US2913626A (en) * 1957-10-04 1959-11-17 Bbc Brown Boveri & Cie Multiple spark gap arrangement for lighining arresters
US3339046A (en) * 1964-05-25 1967-08-29 Bbc Brown Boveri & Cie Blast valve arrangement for compressed gas operated circuit breakers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773994A (en) * 1972-06-30 1973-11-20 Gen Electric Double-exhaust gas-blast circuit breaker

Also Published As

Publication number Publication date
GB1089688A (en) 1967-11-01
CH425950A (de) 1966-12-15
DE1223439B (de) 1966-08-25
SE304785B (enrdf_load_stackoverflow) 1968-10-07
DE6602887U (de) 1969-07-03
FR1495895A (fr) 1967-09-22

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