High- and medium-voltage gas blast circuit breaker

Details High- and medium-voltage gas blast circuit breaker High- and medium-voltage gas blast circuit breaker

1992-05-21

1993-06-01

Scott, J. R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200148B, 200150G, H01H 3388

Patent

active

052162141

ABSTRACT:
A gas blast circuit breaker comprises a cylindrical metal or insulative enclosure filled with pressurized insulative gas, a fixed arc contact and a mobile assembly coupled to an operating member comprising a gas blast cylinder associated with a gas blast nozzle and cooperating with a piston, and a mobile arc contact carried by a tubular member inside the gas blast cylinder. The inside wall of the tubular member comprises a bottleneck whose cross-section is less than the inside cross-section of the tubular member and coaxial therewith. The minimum cross-section of the bottleneck has a diameter less than or equal to the diameter of the inside cross-section of the mobile arc contact and equal to at least 0.75 times the diameter of the inside cross-section of the mobile arc contact. The operation of the circuit breaker is improved by increasing the gas pressure near the mobile arc contact by virtue of a particularly simple and low-cost arrangement.

REFERENCES:
patent: 3858015 (1974-12-01), Deno
patent: 4565911 (1986-01-01), Slamecka
patent: 4939322 (1990-07-01), Kashimura et al.

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