GAS-INSULATED SWITCHGEAR

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear in which reliability of the secondary circuit of a current transformer is improved to stabilize a power system. SOLUTION: The insulation gas is contained in a cylindrical busbar container 1, and a main circuit conductor 2 is stretched and housed. The busbar container 1 is provided with a flange 3, with a current transformer container 4 arranged adjacently. The current transformer container 4 consists of an inner tube 5 and an outer tube 6, and three current transformers 11 are provided on the outer peripheral surface of the inner tube 5 through an insulating buffer material 10. An insulation gap 9 is formed at the other end in the length direction of the inner tube 5, against the busbar container 1. Between the outer tube 6 and the inner tube 5 on the insulation gap 9 side, a varistor (nonlinear resistor) 15 whose resistive value changes according to magnitude of the voltage to be applied is electrically connected by a connection conductor 16. The varistor 15 comes to be conductive when a surge voltage equal to a predetermined value or higher is applied. COPYRIGHT: (C)2010,JPO&INPIT