US3018352A - High tension air blast circuit breakers with a plurality of series connected breaking gaps per pole - Google Patents

High tension air blast circuit breakers with a plurality of series connected breaking gaps per pole Download PDF

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Publication number
US3018352A
US3018352A US843130A US84313059A US3018352A US 3018352 A US3018352 A US 3018352A US 843130 A US843130 A US 843130A US 84313059 A US84313059 A US 84313059A US 3018352 A US3018352 A US 3018352A
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Prior art keywords
piston
breaking
gap
auxiliary
air
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Expired - Lifetime
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US843130A
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English (en)
Inventor
Schulz Richard
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ABB Norden Holding AB
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ASEA AB
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Publication date
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Publication of US3018352A publication Critical patent/US3018352A/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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/16—Impedances connected with contacts
    • H01H33/167—Impedances connected with contacts the impedance being inserted only while opening the switch

Definitions

  • auxiliary breaking gaps In circuit breakers which operate without a series connected switch, it is necessary to interrupt the residual current through the resistances by auxiliary breaking gaps, the contacts of which open a short time after the main breaking gaps. In air blast circuit breakers this delay is generally caused by pneumatic arrangements.
  • the auxiliary breaking gaps are often designed like spark gaps and the residual current is extinguished by the contacts being drawn apart in a container filled with compressed air. If, however, the residual currents through the resistances are high, it will be necessary to subject the auxiliary breaking gaps to blast air. Such arrangements are known.
  • the invention avoids these disadvantages and relates to a device for air blast circuit breakers with a plurality of series connected main breaking gaps per pole and each main breaking gap connected in parallel with a resistance and an auxiliary breaking gap, by which comparatively high residual currents may be interrupted with an unusually low consumption of compressed air.
  • the invention is characterized in that a passage is provided leading past the auxiliary gap to free air, with a blast valve in the passage which is closed shortly after the passage is open to free air by the pressure in the container, and that the valve which controls the opening of the passage also serves for connecting the passage to the interior of the container.
  • the contact of the auxiliary breaking gap which contact is connected to a piston, can suitably be movably 3,618,352 Patented Jan. 23, 1962 ICC arranged in a piston housing.
  • the holding force is neutralized upon a closing action by the supply of compressed air on the back of the piston housing and the piston housing is returned by the spring force to its primary position, so that the auxiliary breaking gap is closed.
  • the opening for the movable contact in the piston housing is suitably designed as an insulating nozzle.
  • FIGURE 1 shows the main breaking gap and the auxiliary breaking gap built together.
  • FIGURE 2 shows the auxiliary breaking gap and its operating mechanism when the auxiliary breaking gap is closed.
  • FIGURE 3 shows the auxiliary breaking in an intermediate position and FIG- URE 4 the auxiliary breaking gap in an open end position.
  • 1 designates an extinguishing chamber filled with compressed air, which chamber is supported by a pillar insulator, not shown, and in which chamber the stationary contact 2 and the movable contact 3 have been arranged.
  • the resistance 4 with the auxiliary breaking gap 5, 6 is connected in parallel with the main breaking gap 2, 3.
  • the movable contact 3 of the main breaking gap which contact is held in closed position by the spring 7, is controlled by the compressed air which, for an opening action, is supplied through the pipe 8.
  • the piston 9 and the diiterential piston 10 are moved to the left, the valve 11 is closed and the blast valve 12 is opened.
  • the compressed air in the chamber may flow through the breaking gap 2, 3 at 13 to the open air.
  • the valve 11 closes the channel 14 and at the same time causes the space 15 to be connected to the open air.
  • the contact 3 of the main breaking gap is moved to the right and the are generated is subjected to a blast of pressure air and is extinguished.
  • the channel 16 in the differential piston 10 after some time causes the pressure on both sides of this piston to be equalized so that the piston 10 under the influence of the spring 17 and the movement of the contact 3, is returned to its initial position and the blast valve 12 is closed again.
  • the compressed air in the space 1 holds the movable contact 3 in open position counter-acted by the spring 7.
  • the piston 18 connected to the movable contact 3 then rests against the smaller surface of the diiterential piston 10 and closes the blast valve 12.
  • FIGURE 2 shows the auxiliary breaking gap 5, 6 connected in parallel to the main breaking gap 2, 3.
  • a piston 19 is connected to the movable contact 5 of the auxiliary breaking gap, which piston under counteraction of a spring 21 can be moved in the piston housing 20.
  • the piston housing 20 is biased by a spring 22 and is arranged in the space 23, which through the openings 24 communicates with the pipe 25.
  • the pipe 25 is, as FIG- URE 1 shows, connected to the stop valve 26, through which the pipe 25 can be connected either to the container 1 or, through the opening 27, to the open air.
  • the valve piston 28 is controlled by the pressure in the pipe 8. When the main breaking gap is closed, as FIG- URE 1 shows, the pipe 8 is not filled with compressed air.
  • the pipe 25 now communicates with the extinguishing chamber 1 and is consequently filled with compressed air, so that the piston housing 20 and the contact 5 are held in closed position by the spring 22.
  • 29 designates the nozzle rigidly connected to the piston housing 20, which nozzle may be designed as an insulating nozzle and has an opening therein for the movable contact.
  • FIGURE 1 shows the auxiliary gap in closed position. If the pipe 8 is supplied with compressed air, the main breaking gap is opened and, immediately after, the valve head 28 is moved to the left, whereby the pipe 25 is emptied through the opening 27. The consequence is that the compressed air in the chamber 1 acts through the openings 30 on the piston 19 and moves this upwards against the counter-action of the spring 21 until the piston meets the pin 31 in the piston housing 20 (FIGURE 3).
  • the generated arc is, during the course of this, extinguished in the nozzle 29. Due to the influence of the compressed air the piston 19 with the contact 5 and the piston housing 20 is moved further upwards so that the spring 22 is compressed. The extinguishing gases from the auxiliary breaking gap flow through the channels 30, 32, 33 and the openings 24 (FIGURE 4) into the pipe 25 and out to the open air. In the upper position of the piston housing 20, the opening 35 and by that the openings 24, are closed by blast valve 34 seating over opening 35 so that in this position the compressed air is kept from flowing out to the open air. The pressure on both sides of the piston 19 has now been equalized through the channels 32 so that the spring is able to move the movable contact 5 of the auxiliary breaking gap closer to the stationary contact 6 while maintaining a sufficient insulating distance.
  • a high tension air blast circuit breaker comprising a container for compressed m'r, a main breaking gap, a resistance and an auxiliary breaking gap connected in series with each other and in parallel with the main breaking gap, means forming a passage extending from the container past the auxiliary gap to free air, blast valve means in said passage on the opposite side of the auxiliary gap from the container operable by the pressure in the container to close the passage after connection of the passage to free air, and stop valve means for selectively connecting the part of the passage on the opposite side of the blast valve from the container to free air and to the container, said auxiliary breaking gap having a movable contact, a movable piston housing rigid with the blast valve, a piston movably arranged in said housing and rigid with the movable contact, said contact and piston, when said part of the passage is connected with free air, being moved relative to said housing to open the auxiliary breaking gap and means for returning said contact and piston to their original position in the housing when said blast valve is closed.
  • a high tension air blast circuit breaker in which the piston housing is provided with an opening for the movable contact, said opening being shaped like a nozzle, the portion of the housing forming the nozzle being of insulating material.

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  • Circuit Breakers (AREA)
US843130A 1958-10-10 1959-09-29 High tension air blast circuit breakers with a plurality of series connected breaking gaps per pole Expired - Lifetime US3018352A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV15185A DE1063682B (de) 1958-10-10 1958-10-10 Hochspannungsdruckluftschalter mit Vielfachunterbrechung pro Pol

Publications (1)

Publication Number Publication Date
US3018352A true US3018352A (en) 1962-01-23

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US843130A Expired - Lifetime US3018352A (en) 1958-10-10 1959-09-29 High tension air blast circuit breakers with a plurality of series connected breaking gaps per pole

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US (1) US3018352A (de)
CH (1) CH372728A (de)
DE (1) DE1063682B (de)
FR (1) FR1226377A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108168A (en) * 1960-09-07 1963-10-22 Asea Ab Device for air blast circuit breaker
US3198916A (en) * 1962-11-29 1965-08-03 Ite Circuit Breaker Ltd Vented movable resistor contact for air blast circuit breakers
CN1084036C (zh) * 1996-01-31 2002-05-01 Gec阿尔斯托姆T&D公司 具有闭合切入电阻的高压断路器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3023291A (en) * 1959-08-31 1962-02-27 Westinghouse Electric Corp Compressed gas circuit interrupter
DE1163940B (de) * 1960-02-25 1964-02-27 Asea Ab Druckluftschalter mit reihengeschalteter Trennstelle in einer Durchfuehrung
DE1261930B (de) * 1961-03-23 1968-02-29 Liebknecht Transformat Hochspannungsdruckgasschalter
DE1186931B (de) 1963-06-28 1965-02-11 Bbc Brown Boveri & Cie Druckgasschalter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747055A (en) * 1952-05-31 1956-05-22 Asea Ab High tension circuit breakers
US2786119A (en) * 1954-02-17 1957-03-19 Asea Ab Valve arrangement for air blast circuit breakers
US2786117A (en) * 1954-02-17 1957-03-19 Asea Ab Air blast circuit breaker with parallel resistances
US2908788A (en) * 1956-04-14 1959-10-13 Asea Ab Arrangement in electric air blast circuit breakers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747055A (en) * 1952-05-31 1956-05-22 Asea Ab High tension circuit breakers
US2786119A (en) * 1954-02-17 1957-03-19 Asea Ab Valve arrangement for air blast circuit breakers
US2786117A (en) * 1954-02-17 1957-03-19 Asea Ab Air blast circuit breaker with parallel resistances
US2908788A (en) * 1956-04-14 1959-10-13 Asea Ab Arrangement in electric air blast circuit breakers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3108168A (en) * 1960-09-07 1963-10-22 Asea Ab Device for air blast circuit breaker
US3198916A (en) * 1962-11-29 1965-08-03 Ite Circuit Breaker Ltd Vented movable resistor contact for air blast circuit breakers
CN1084036C (zh) * 1996-01-31 2002-05-01 Gec阿尔斯托姆T&D公司 具有闭合切入电阻的高压断路器

Also Published As

Publication number Publication date
CH372728A (de) 1963-10-31
DE1063682B (de) 1959-08-20
FR1226377A (fr) 1960-07-11

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