GAS-INSULATED SWITCHGEAR

PROBLEM TO BE SOLVED: To reduce the size of a GIS by raising the pressure of insulating gas sealed into a unit, and to prevent reduction in the number of times of the opening/closing of a vacuum interrupter caused by the raise of the gas pressure, in the GIS using the vacuum interrupter. SOLUTION: The GIS 1 is constituted of: vessels 3, 5 that accommodate electric apparatuses and are sealed with insulating gases higher than the air in pressure by 0.3 to 0.7 MPa; and a vessel that is gas-divided from the those vessels, accommodates the vacuum interrupter and is sealed with insulating gas higher than the air in pressure by 0.03 to 0.2 MPa. In the vessel accommodating the vacuum interrupter, the fatigue of a metal bellows can be reduced since low gas-pressure in consideration of only an insulating characteristic is sealed. In the other vessel accommodating the electric apparatus, the vessel can be reduced in size by raising the pressure of the insulating gas, thus achieving the reduction in the size of the GIS as a whole. COPYRIGHT: (C)2006,JPO&NCIPI