High rupture capacity circuit-breaker

Details High rupture capacity circuit-breaker High rupture capacity circuit-breaker

1992-05-15

1994-01-04

Scott, J. R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200148A, H01H 3316

Patent

active

052762858

ABSTRACT:
A high-voltage circuit-breaker has an interrupting chamber comprising a gas-tight cylindrical casing filled with a gas having good insulative properties such as sulfur hexafluoride. The casing contains a fixed permanent contact, a fixed arc contact and a mobile assembly comprising permanent contacts and arc contacts and associated with a gas blast assembly. The chamber also contains a carbon-based resistor having a resistance of approximately 500 ohms connected in parallel with the circuit-breaker contacts when the arc contacts are opened by an auxiliary switch. This resistor is connected in series with an arrangement of varistors, the resulting combination being disposed inside the casing and connected in series with the auxiliary switch. Opening of the auxiliary switch is effected by opening of the circuit-breaker. The volume of the resistor is greater than that of the arrangement of varistors by a factor of at least five.

REFERENCES:
patent: 2724755 (1955-11-01), Morgan
patent: 3745505 (1973-07-01), Turnbull et al.
patent: 4338500 (1982-07-01), Pham et al.
patent: 4434332 (1984-02-01), Yanabu et al.
patent: 4439651 (1984-03-01), Thuries et al.
patent: 5164559 (1992-11-01), Pham et al.
patent: 5170023 (1992-12-01), Pham et al.
IEEE Transactions on Power Apparatus and Systems, vol. PAS99, No. 1, Jan., 1980, New York, U.S., pp. 69-77; H. E. Gallagher et al.: "145-kV Current Limiting Device-Field Tests".

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