Patent ID: 7931741
Filing Date: 2011-04-26
Classification: H02G

Abstract:
1. A gas-insulated switchgear apparatus comprising: an electrically grounded gas tank that is hermetically filled with an insulating gas; a gas filling opening provided on the gas tank, the gas filling opening including a gas flange at its end; and a gas filter device that is fixed to the gas flange of the gas filling opening provided on the gas tank, the gas filter device including first and second plates together forming a gas flow through-hole extending in a flow direction, and a gas filter pressed between the first and second plates in the flow direction and extending across the gas flow through-hole, and further including a gas filter formed with a porous insulating material having pores with a diameter in a range from tens of micrometers to hundreds of micrometers, wherein the gas filter has stability against the insulating gas and a decomposition gas of the insulating gas, and the pressing of the gas filter between the first and second plates is effected through first and second seal rings, respectively, the first seal ring disposed between the gas filter and the first plate, and the second seal ring disposed between the gas filter and the second plate, the first and second seal rings extending around the gas flow through-hole.