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AssigneeKabushiki Kaisha Toshiba
InventorsYukio Kanazawa, Masahiro Hanai, Hiroshi Furuta
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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.
A gas insulated switchgear having, in a container where an arc-extinguishing gas is sealed, an arc-extinguishing chamber having a pair of arc contacts capable of contacting with/separating from each other, a puffer chamber formed by a puffer piston and a puffer cylinder provided on the side of one of the arc contacts, and a nozzle integrally fixed with said puffer cylinder, such that compression of said puffer chamber causes said arc-extinguishing gas to be led to said nozzle and blown onto an arc formed between said pair of arc contacts, whereby the arc is extinguished;
Dependencies are inferred from the claim text.