Gas circuit breaker and liquid pressure-driving system to be use

Details Gas circuit breaker and liquid pressure-driving system to be use Gas circuit breaker and liquid pressure-driving system to be use

1996-11-13

1998-09-08

Spyrou, Cassandra C.

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

Air-current blowout

200 82B, H01H 3538

Patent

active

058047875

ABSTRACT:
For the purpose of providing a gas circuit breaker with a structure of hydraulic pressure operation system capable of detecting the occurrence of an incomplete closed state of the valves therein to prevent their erroneous motion during the subsequent motion, and a liquid-pressure driving system to be used therefor, a check valve is arranged so as to suppress the flow into the space on the side of the downstream of a closed-circuit operation spool valve, wherein the space on the side of the downstream of the closed-circuit operation spool valve is connected through a second diaphragm to a low-pressure oil tank and the operation time or operation number of a liquid-pressure pump is measured.

REFERENCES:
patent: 3832502 (1974-08-01), Grieger et al.
patent: 3969985 (1976-07-01), Grieger et al.
patent: 4404892 (1983-09-01), Nakamura et al.
patent: 5353594 (1994-10-01), Yamashita et al.

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