Three-station isolation ground switch

Abstract

The invention relates to a three-station isolation ground switch in the technical field of high-voltage switches, comprising a shell, insulating parts, a static side part, a moving contact, a moving contact seat, a transmission structure, a support seat, a grounded part and an end cover, wherein the support seat and an inner cavity insulation part are arranged in the inner cavity of the shell in sequence; the moving contact seat is fixedly arranged on the support seat; the transmission structure is arranged on the moving contact seat and is meshed with the moving contact arranged in a conductor hole of the moving contact seat, and the moving contact is driven to be respectively contact with the grounded part and the static side part; the two insulating parts and the end cover are respectively connected with the shell; the static side part is arranged on the insulation parts of the inner cavity of the shell; and the grounded part is arranged on the end cover. In the invention, the whole three-station isolation ground switch is horizontally arranged so that operate power required by the three-station isolation ground switch when switching on an isolation switch and a ground switch is consistent. Moreover, the design of a guide sleeve and a guide piece is adopted, thereby reducing the abrasion of a spring contact, improving the mechanical property of a product and improving the reliability of the product.

Description

technical field [0001] The invention relates to a device in the technical field of high-voltage switches, in particular to a 252kV three-position isolating grounding switch for gas-insulated metal-enclosed combined electrical appliances. Background technique [0002] The three-phase isolating switch and grounding switch in the traditional 252kV GIS are installed in different metal shells, and two sets of different mechanisms are used to drive to realize the opening and closing functions. Since they are installed in different shells, the air chambers need to be connected through external copper pipes to form a whole. In order to prevent air leakage at the connection surface, a lot of sealing surface structures are added between the copper pipe and the shell, which not only increases the cost of the equipment but also increases potential air leakage points, leaving hidden dangers for the normal operation of the equipment. There are also the disadvantages of complex structure ...

AI Technical Summary

Problems solved by technology

In order to prevent air leakage at the connection surface, a lot of sealing surface structures are added between the copper pipe and the shell, which not only increases the cost of the equipment but also increases potential air leakage points, leaving hidden dangers for the normal operation of the equipment

In addition, there are disadvantages of complex structure and large volume.

[0003] After searching the prior art, it is found that Chinese Patent Publication No. CN 201170993Y records a "three-position isolating grounding switch". The applied voltage level of the three-positioning isolating grounding switch is low, only 145kV; ) is non-horizontally arranged and there is no guide for the movement in the support (3), and the spring contact constrains the moving contact rod of the rack to move in the support, resulting in serious wear of the spring contact and affecting the mechanical properties of the product

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