HIGH- OR MEDIUM-VOLTAGE ELECTRICAL SWITCHGEAR OF THE GAS INSULATED TYPE INCLUDING A ROTARY DRIVE SHAFT AND A MOVABLE CONTACT DRIVEN BY SAID SHAFT WITH AN IMPROVED MOUNTING, APPLICATION TO THREE-PHASE SUBSTATIONS

摘要

The invention relates to a mounting solution for mounting a metal casing (57) inside a metal tank (10) of electrical switchgear (A, B, C), the casing being fastened at a single point (12) to an insulating part (11) and housing at least one movable contact (51, 55) of a switch having its rotary drive shaft segmented into two portions arranged laterally on either side of the movable contact and supported directly or indirectly by the tank. Connection means are provided for connecting the casing (57) to the tank that comprise a bar and that are adapted to arrange longitudinal axial clearance along the bar between at least a portion of the bar and the casing and/or the means for connecting the shaft portions in rotation to each other and with the contact or with at least one intermediate contact drive element, the means being adapted to arrange longitudinal axial clearance along the shaft between at least a portion of the shaft and the contact or the drive element. One or both of the axial clearances serves to compensate thermal expansions that might occur between the tank and the insulating part and to minimize any turning of the