Patent ID: 9269475
Filing Date: 2016-02-23
CPC Classification: H01B,H02G

Claim Text:
1. A gas-insulated bus bar comprising: a cylindrical metal container that is arranged with insulation gas filled therein; a pair of main circuit conductors that are accommodated in the metal container, extended in parallel to an axis line of a main body of the metal container, and have cross sections with a same circular outer shape; an insulation spacer of a one-legged structure that is arranged in the metal container in a direction of the axis line of the main cylindrical body at a predetermined interval and includes one end portion attached to the metal container and the other end portion holding the pair of main circuit conductors in the metal container while electrically insulating the pair of main circuit conductors from the metal container, thereby supporting the pair of main circuit conductors in the metal container such that the pair of main circuit conductors is insulated from the metal container; a branch pipe that is provided on a side of the metal container, arranged in the direction of the axis line at the predetermined interval corresponding to a place where the insulation spacer is arranged, and branched in a direction substantially perpendicular to the axis line, thereby including an inside portion where the one end portion of the insulation spacer is arranged; a shield made of metal only and in which the pair of main circuit conductors are connected at their end portions, so that the shield covers connection portions of the pair of main circuit conductors, the shield is attached to the other end portion of the insulation spacer such that the end portions of the pair of main circuit conductors that are connected to the shield are located only at a location where the branch pipe is provided, has an outer diameter larger than an outer diameter of each of the pair of main circuit conductors and includes an inside portion into which the pair of main circuit conductors is inserted, and holds the pair of main circuit conductors in the metal container, the shield including an annular plate portion protruding from an inner surface the shield at a center portion of the shield; and an adaptor conductor having a flange portion that is directly fixed to the annular plate portion of the shield, and the adaptor conductor has a pair of contact bars on each opposing side, each contact bar extending in parallel to the axis line and having an end portion facing an end portion of one of the pair of main circuit conductors; and a pair of contact electrodes made of metal each of which covers and electrically contacts a contact portion between the end portion of one of the pair of main circuit conductors and the end portion of a corresponding one of the pair of contact bars, and each of which is slidable along the axis line of the main body of the metal container, wherein with a planar view from a direction parallel to a branching direction of the branch pipe, the insulation spacer and the shield have such respective sizes that are arranged within an area defined by an inner diameter of the branch pipe, the end portion of one of the pair of main circuit conductors is inserted into an opening of the shield on one side to face the end portion of one of the contact bars of the adaptor conductor in the direction of the axis line, and the end portion of the other one of the pair of main circuit conductors is inserted into another opening of the shield on the other side to face the end portion of the other contact bar of the adaptor conductor in the direction of the axis line.