Patent ID: 7683286
Filing Date: 2010-03-23
Classification: H01H

Abstract:
1. A switchgear having interrupters wherein at least two moving contacts are capable of being opened and closed with respect to respective fixed contacts, which comprises a non-earthed metal vacuum chamber enclosing the interrupters therein, a connection conductor for connecting the moving contacts, an operating rod connected to the connecting conductor by means of an insulator and protruding from the non-earthed metal vacuum chamber, a sealing means for sealing the protrusion of the operating rod at the non-earthed metal vacuum chamber, circuit terminals protruding from the non-earthed vacuum chamber, an insulating mold covering an outer periphery of the non-earthed metal vacuum chamber, an earth layer surrounding an outer periphery of the insulating mold, and a potential control means connected between the circuit terminals, a physical intermediate point of the potential control means being connected to the non-earthed metal vacuum chamber for controlling the potential of the non-earthed metal vacuum chamber.