Patent ID: 8748770

Claim:
A power switching apparatus comprising: a pressure tank having tube-like openings branched from a shank portion and having an insulating gas sealed therein; a vacuum valve housed in the pressure tank and connected to the pressure tank at one end; bushing conductors penetrating through the openings of the pressure tank and electrically connected to the vacuum valve; and current transformers provided on an outside of the pressure tank and measuring a current flowing through the bushing conductors, wherein: tube-like current transformer installation portions on which to install the current transformers are provided above the openings of the pressure tank and an outside diameter of the openings of the pressure tank is made larger than an outside diameter of the current transformer installation portions; and intermediate bushings made of an insulator and having a larger outside diameter in a portion corresponding to the openings than in a portion corresponding to the current transformer installation portions are provided along outer circumferences of the bushing conductors.