Gas circuit breaker

Details Gas circuit breaker Gas circuit breaker

1990-11-16

1991-12-10

Broome, Harold

Electricity: circuit makers and breakers

Liquid contact

Time delay

200148R, H01H 3382

Patent

active

050720848

ABSTRACT:
A gas circuit breaker includes a pair of separable contact portions, a nozzle of an electrically insulating material surrounding the contact portions to guide a flow of gas, and a buffer chamber for compressing the gas upon a separating operation of the contact portions so as to supply the gas under the guidance of the insulating nozzle. The gas from the puffer chamber is exhausted through exhaust passages passing through a hollow portion of a movable one of the contactors. The exhaust passages are formed between the puffer chamber and the movable contactor. A blocking arrangement, during initial stage of the separating operation, closes the exhaust ports of the exhaust passages and subsequently opens the exhaust ports located on a downstream side of the gas flow. The blocking arrangement, of an electrically insulating material, is divided along an axial direction of the gas circuit breaker. Electrical insulating material of the blocking arrangement is fastened by springs from the exterior of the circuit breaker to reduce unnecessary gas flow from the puffer chamber through the blocking arrangement.

REFERENCES:
patent: 3839613 (1974-10-01), Tsubaki et al.
Development of 240/300KV, 50KV, 2,000A, 4,000A, 8,000A, 2-Cycle Puffer Type SF.sub.6 Gas CB, Hitachi Review 23 (1974).
"Development of High Power 2 Cycle Puffer Type Gas Circuit Breakers", IEE Conf Paper C74089-9, 1973.

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