Patent ID: 7193172

Claim:
A gas-insulated switchgear tank in which an electric insulating characteristic is improved by a gas, comprising a vacuum circuit-breaker, a disconnecting switch, and a container in which the vacuum circuit-breaker and the disconnecting switch are arranged and an inside of which container is hermetically sealable and filled with the gas such that the vacuum circuit-breaker and the disconnecting switch are at least partially surrounded by the gas, wherein the gas includes N 2 and O 2 , the container includes a first compartment in which at least a part of the vacuum circuit-breaker is exposed to the gas, and a second compartment gaseously isolated from the first compartment and in which at least a part of the disconnecting switch is exposed to the gas and a gaseous pressure in the first compartment is lower than a gaseous pressure in the second compartment, and the vacuum circuit-breaker has a vacuum chamber and a deformable bellows configured to expand and to contract a contact movable in the vacuum chamber, and an outer periphery of the vacuum chamber arranged to be exposed to the gas in the first compartment.