Patent ID: 8269126
Filing Date: 2012-09-18
Classification: H01H

Abstract:
1. 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; wherein said nozzle is formed of a fluororesin having a chlorine-containing resin as a marking substance uniformly mixed therein for indicating a wear limit of the nozzle, and said marking substance is released in gaseous form into said gas as said nozzle part wears down through thermal decomposition by heat from said arc.