Gas insulated switchgear and method for detecting arc damage...

Details Gas insulated switchgear and method for detecting arc damage... Gas insulated switchgear and method for detecting arc damage...

2007-10-10

2010-10-19

Fitzgerald, John (Department: 2856)

Electricity: measuring and testing

Electromechanical switching device

Reexamination Certificate

active

07816924

ABSTRACT:
The invention provides a gas insulated switchgear, and a method for detecting arc damage in a part used in a gas insulated switchgear, which detect directly when an electric contact or a peripheral part reaches an initially set wear limit. An insulating nozzle of a circuit breaker contains a marking substance that releases a gaseous substance inside a circuit breaker gas container as a result of wear by an arc. For ensuring heat resistance and insulation properties, the insulating nozzle is ordinarily formed of a fluororesin, but in the present invention, it is formed of the ordinarily used fluororesin having uniformly mixed therein, as the marking substance, a chlorine-containing resin which has excellent heat resistance and insulation properties such as polyvinylidene chloride.

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