US3236983A - Compressed gas circuit breaker with quick opening contacts - Google Patents

Compressed gas circuit breaker with quick opening contacts Download PDF

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Publication number
US3236983A
US3236983A US313671A US31367163A US3236983A US 3236983 A US3236983 A US 3236983A US 313671 A US313671 A US 313671A US 31367163 A US31367163 A US 31367163A US 3236983 A US3236983 A US 3236983A
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US
United States
Prior art keywords
cylinder
pressure chamber
high pressure
contact member
drive 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
US313671A
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English (en)
Inventor
Frowein Egbertus
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
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 Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US3236983A publication Critical patent/US3236983A/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
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas

Definitions

  • the present invention relates to a switching device, working in the impulse manner, for compressed gas circuit breakers operating with a closed gas circuit, in which the breaker arc is quenched by a quenching gas, particularly SFS, stored in a high pressure chamber, the circuit breaking gases being caught up in a low pressure chamber, and in which the breaker piece, counteracting a switch-on spring, and the blast valve are rigidly connected with each other by a common, compressed gas operated drive piston guided in a drive cylinder.
  • a quenching gas particularly SFS
  • the breaking points for the interruption of the load open up only for short periods, if one or several voltage interruption points are present which are connected electrically in series with the load interrupting points and safeguard insulation of the breaker from high voltage in the off position of the breaker.
  • the voltage interrupting points may be constructed for instance as so-called series interrupters.
  • a compressed air operated circuit breaker with a series ing terrupter has become known in which the load interrupting points are designed as a switch device opening for short periods and whereby the movable, pin-shaped breaker piece is connected to a compressed air operated piston which simultaneously carries a part serving as the valve member of a blast valve arranged directly at the arc ⁇ sector of the breaker.
  • the present invention is based upon a simple solution to attain short switching periods, particularly for compressed gas circuit breakers using SFS as the quenching and regulating medium.
  • it is therefore proposed to provide an auxiliary valve shiftable in the axial direction of the movable breaker piece, this valve serving to close off the regulating chamber of the drive cylinder against the regulating valve due to its being automatically taken along in the last part of the breaking motion and subsequently held there pneumatically, whereby the regulating chamber communicates with the high pressure chamber via an opening in the drive cylinder.
  • a support insulator is designated by 1 which serves simultaneously to divide the breaker vessel which is not represented in detail, into a low pressure chamber 29 and a high pressure chamber 30.
  • Embedded in support insulator 1 is ange 2 to which the ixed contact carrier 3 is screwed pressure tight.
  • the tubular current 4conductor is designated as 5 which, via part 3, is in electrical contact with breaker part 4.
  • support insulator 1 is connected by ribs 1a to an annular tlange 1b which is connected to cylinder 7 via plate 6.
  • drive piston 8 which on the one hand carries tubular piece 9 and on the other receives the movable breaker contact piece 10 which rests on the top of drive piston 8 by means of a collar and is fixed in position by ring 18 beneath the piston which is expediently designed as a retaining ring for instance.
  • Breaker piece 10 lies within the tubular piece 9 and, at its upper end, carries contact cup 11 as well as the axially movable burner piece 12 which is loaded by compression spring 13.
  • the breaker piece 10 which forms the movable contact member of the circuit breaker includes a tubular portion 1Gb which depends from drive piston 8 thus extending into cylinder 7 and terminating in an end cap 10a.
  • the tubular portion 10b is guided in sliding contact 17 which serves to transmit the current between the breaker piece 10 and the guide cylinder 14a, the latter and the guide part 14 being tightly screwed together.
  • the top of cylinder 14a is rigidly connected with sleeve 15 which simultaneously serves for mounting of soda plates 16 which surround the tubular depending portion 10b of the movable contact member and against which strikes the lower end face of drive piston 8. Openings 2S of cylinder 14a connect chamber 27h within this cylinder with chamber 27C within cylinder 7, while the openings 14h in guide part 14 connect chamber 27a with chamber 27e. Further, in guide part 14 which -serves as an outlet for the lower end of drive cylinder 7, this part including an elbow duct 27a.
  • Packing ring 23 is inserted at one end of the elbow which is in alignment with the axis of movement of piston 10 and valve plate 20 of the auxiliary valve glides in it via rod 21.
  • the valve plate 20 is adapted to seat on ring 23 and also has a contact surface 26a and is loaded by spring 22 while switch-on spring 19 within and adjacent the inner wall of cylinder 7 is supported between drive piston 8 and guide part 14.
  • the latter has ribs 14C carrying the guide housing 14d for the regulating valve.
  • the regulating or control valve member is designed as a sleeve 24, with ribs carrying the actuating rod 24a which is slidable in part 14d.
  • Sleeve 24 is designed as a valve at both ends and works together with packing rings 25 and 26 respectively, which are inserted in the guide housing 14d and in the other end of the elbow duct 27a.
  • Cylinder 7 has an opening 7a through which the high pressure chamber 30 communicates with chamber 27e.
  • the mode of operation of the new arrangement is the following:
  • the movable breaker piece with its end cap 10a strikes against the contact surface 20a of the valve plate and presses it downwards until it reaches its lower end position in contact with packing ring 23.
  • the regulating chamber 27a is closed off against chambers 27b, 27e ⁇ which now will ll up again with high pressure gas from chamber through the opening 7a of cylinder 7.
  • the drive piston 8 is brought back to its upper end position, as drawn, by the switch-on spring 19 so that the breaker device closes again and blasting stops when tubular body 9 hits against packing ring 3a.
  • valve plate 20 of the auxiliary valve thereby remains firmly pressed against packing ring 23 ⁇ in its lower end position under the effect of the high pressure reaching the upper side of the valve plate 20 from chamber 27C via the openings 14h.
  • a voltage interrupter connected electrically in series with the load interrupter and not illustrated, which opens in the known manner before the load interrupter commences its closing motion.
  • This voltage interrupter also takes over the closing of the breaker.
  • sleeve 24 of the regulating valve is brought back to its left end position as drawn, permitting high pressure gas from chamber 30 into chamber 27a so that, due to pressure equalization on both sides of the valve plate 20, the latter moves upwards under the effect of spring 22 into the drawn position.
  • the circuit breaker device is then again ready for the next cycle.
  • the new arrangement is not limited to the illustrated embodiment. It can be expedient in certain cases to arrange the regulating valve 24 in the same axial direction instead of perpendicular to the axis of the breaker device as illustrated. Also, several of such breaker devices may be connected electrically in series thus obtaining a breaker with multiple interruption. In this case one common regulating valve may be provided for each two neighboring circuit breaker devices whereby a voltage interrupter may also replace one of the breaker devices. Due to their arrangement, the movable parts and packing rings in the high pressure chamber are advantageously withdrawn from the attack of the breaker gases. Another yadvantage results from the arrangement of the circuit breaker nozzle Contact at the support insulator which makes for good accessibility of the breaker parts from the low pressure chamber when checking.
  • a compressed gas actuated circuit breaker having a closed gas circuit
  • the combination comprising means providing a high pressure chamber filled with an arc extinguishing gaseous medium such as SP6, means providing a low pressure chamber separated from said high pressure chamber by a support insulator, a fixed contact member in the form of a nozzle mounted by said support insulator and through which the compressed gas can flow in passing from said high pressure chamber to said low pressure chamber for collection in the latter, a drive cylinder mounted in said high pressure chamber, the wall of said cylinder being provided with an aperture placing the interior and exterior of said cylinder in communication with each other, a compressed gas actuated drive piston mounted for sliding movement in said drive cylinder, said drive piston including thereon a movable contact member normally engageable with said fixed contact member by means of a loading spring which normally maintains said drive piston at one end of said cylinder and a blast valve sleeve surrounding said movable contact member and normally engaged with ya sea-t closing off communication between said high pressure chamber and the junction between said normally

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  • Circuit Breakers (AREA)
US313671A 1962-11-08 1963-10-03 Compressed gas circuit breaker with quick opening contacts Expired - Lifetime US3236983A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1304462A CH397038A (de) 1962-11-08 1962-11-08 Impulsartig arbeitende Schalteinrichtung für Druckgasschalter

Publications (1)

Publication Number Publication Date
US3236983A true US3236983A (en) 1966-02-22

Family

ID=4388794

Family Applications (1)

Application Number Title Priority Date Filing Date
US313671A Expired - Lifetime US3236983A (en) 1962-11-08 1963-10-03 Compressed gas circuit breaker with quick opening contacts

Country Status (3)

Country Link
US (1) US3236983A (cs)
BE (1) BE639624A (cs)
CH (1) CH397038A (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521016A (en) * 1966-12-29 1970-07-21 Ite Imperial Corp Stationary contact having sealing gasket support structure
US4072838A (en) * 1974-12-10 1978-02-07 Bbc Brown, Boveri & Company Limited Electrical power switch with pressurized gas blasting device for lengthening the switching arc

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521016A (en) * 1966-12-29 1970-07-21 Ite Imperial Corp Stationary contact having sealing gasket support structure
US4072838A (en) * 1974-12-10 1978-02-07 Bbc Brown, Boveri & Company Limited Electrical power switch with pressurized gas blasting device for lengthening the switching arc

Also Published As

Publication number Publication date
BE639624A (cs)
CH397038A (de) 1965-08-15

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