Gas insulated bus and particle removal method for gas insulated bus

A particle removal method for removing a particle having entered the metal container of a gas insulated bus comprising:

• coupling a metal container for applied voltage comprising a line for applied voltage for applying a voltage to the conductor of the gas insulated bus, to a flange on one end of the metal container of the gas insulated bus formed at respective opposite ends of the metal container and which is coupled to a metal container of another gas insulated bus, and coupling a testing seal container to a flange on the other end;
• installing the metal container at least in an inclined manner and containing insulating gas in the respective containers;
• and
• applying a voltage to the conductor in a stepwise fashion via the metal container for applied voltage to allow a particle present in the metal container of the gas insulated bus to float and accumulate to collect the particle in the expanded diameter part located at a low position of the inclined metal container, wherein
• said gas insulated bus comprises a conductor supported in a cylindrical metal container via an insulator, insulating gas being contained in the metal container, wherein the metal container comprises an expanded diameter part formed over a given range in an area of the metal container in which the insulator is positioned and a reduced diameter part formed over an entire area of the metal container except of the expanded diameter part.