Abstract: A gas insulated electrical apparatus in which electric devices for three phases are housed within a common gas-filled vessel includes a first and a second curved wall spaced apart from each other by a first distance and a third and a fourth curved wall connected between the first and second curved walls and spaced apart from each other by a second distance smaller than the first distance to define a substantially oval cross-sectional shape. The electric devices are arranged in a row extending between the first and second walls. The first and second curved walls may have a first radius of curvature and the third and fourth curved walls may have a second radius of curvature larger than the first radius of curvature.

Abstract: A gas insulated switchgear apparatus comprising connection conductors connected to a connection portion to breaker side, disconnectors connected to the connection conductors, cable heads connected to the disconnectors, lightning arresters having one end connected between the disconnectors and the cable heads, single phase voltage transformers provided in one of three phases and having one end connected between the disconnectors and the cable heads and a disconnector cylindrical vessel filled with an insulating gas and containing the connection conductors, the disconnectors, the cable heads, the lightning arresters and the single phase voltage transformers therein. The cable heads are disposed so that the axis of the disconnector cylindrical vessel and the axes of the cable heads are parallel. The lightning arresters are disposed so that the axis of the disconnector cylindrical vessel and the axes of the lightning arresters are parallel.