Abstract: A gas insulated switch-gear wherein power circuit breakers, disconnecting switches, earthing switches and the like constituting a power electric sub-station are enclosed in earthed metallic vessels and insulation therein is effected by means of insulated arc-suppressing gas is housed in a switching house, a bushing forming a terminal at the electric power line side is provided separately outside of the switching house, and said bushing located outside and gas insulated switch-gear is electrically connected by means of gas insulated bus bar, to thereby eliminate a wall bushing.

Abstract: Gas circuit breakers, gas insulated disconnecting switches, current transformers, gas insulated feeding bus bars and other main component devices making up a gas insulated power switch-gear apparatus used for the power electric substation or the power electric switching station are arranged in at least one straight line in a horizontal plane. Gas insulated main bus bars are arranged substantially at right angles to the straight lines including the component devices, in a different plane parallel to the above-mentioned plane containing the devices, thus reducing the height of the apparatus as a whole and at the same time improving the earthquake-proofness thereof.