Arc-extinguishing device for load switch

Abstract

The invention relates to an arc control device in a load switch, which is particularly applicable to SF6 gas-filled switching equipment, belonging to the technical field of intermediate voltage electric equipment. The arc control device is characterized in that an arc control grid is improved to have a frame structure with an open front and an back, is benefit for the insert connection with a flat arc control grid sheet\; the arc control grid sheet is provided with grooves and holes in pattern which are asymmetric, so that an electric arc can be stretched and can be cut into a plurality of short electric arcs to effectively prevent arc restrike after current passes zero and improve the performance of arc control. The arc control grid sheet is made of a silicon-steel plate, electric pure iron and other magnetic conductive materials, and the excellent magnetic conductive performance ensures that the electric arc can be automatically introduced into the arc control device under the action of electromagnetic field force, thereby improving the effect of arc control. Because the arc control grid sheet has a sheet shaped structure without a special mould, the arc control grid sheet becomes simply through processing by laser cutting equipment or numerical punching equipment. The arc control device has the advantages of simple structure, good arc control performance and strong practicality, and can replace the prior arc control device in the prior load switch.

Description

technical field [0001] The invention relates to an arc extinguishing device in a load switch, especially suitable for SF6 gas charging switchgear, and belongs to the technical field of medium voltage electrical equipment. Background technique [0002] SF6 gas-filled switchgear has been developed rapidly due to its small size, high reliability, full insulation and full sealing, and good safety. Its core component is a load switch, which is equipped with an arc extinguishing device. At present, the arc extinguishing device in the SF6 load switch generally consists of an arc extinguishing grid frame and a plurality of arc extinguishing grid pieces installed on the arc extinguishing grid frame. The arc extinguishing grid frame seems to be in the shape of a brush, and the arc extinguishing grids are respectively inserted into the slots on one side of the brush arm. The arc extinguishing device with this structure mainly has the following disadvantages: [0003] 1. The arc extin...

AI Technical Summary

Problems solved by technology

[0003] 1. The arc extinguishing grid is designed with a protrusion matching the arc extinguishing grid frame, which requires special mold processing, complex processing procedures and low manufacturing efficiency

[0004] 2. The assembly of the arc extinguishing grid and the arc extinguishing grid requires special tooling, and the assembly efficiency is low

[0005] 3. The front edge profile of the arc extinguishing grid is symmetrical U-shaped, and the arc extinguishing effect is not ideal

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