Three-working-position isolation switch

Abstract

The invention provides a three-working-position isolation switch. An isolation switch static contact and a grounding switch static contact are provided at two ends in a three-phase together box body. A moving contact is positioned at a middle position between the isolation switch static contact and the grounding switch static contact. An operation mechanism controls the moving contact to move between the isolation switch static contact and the grounding switch static contact and controls two ends of the moving contact to contact the isolation switch static contact or the grounding switch static contact individually respectively. The isolation switch static contact is provided with an arc ignition structure inside. According to the invention, functions of the isolation switch and the grounding switch are combined as one body, operation and electric interlocking are simplified, a volume is greatly reduced, the arc ignition structure can prevent arc burning from damaging electric appliance, and the three-working-position isolation switch has the advantages of simple structure, compactness, a small volume, safety, reliability, good stability, low cost and a long service life.

Description

technical field [0001] The invention belongs to a three-position isolating switch. Background technique [0002] The traditional isolating switch and grounding switch are set separately, and the mechanical and electrical interlocking structure between the isolating switch and the grounding switch is complex, which occupies a large volume in the H-GIS combined electrical appliance. Excessive volume of the isolating switch and the grounding switch is not only unfavorable for the installation and use of the H-GIS combined electrical appliance, but also makes the H-GIS combined electrical appliance poor in stability and large in size, affecting its normal use. On the other hand, in order to ensure good contact between the two contacts of the high-power switch, several ring-shaped watch strap contacts are usually set in the static contact, but the arc generated when the two contacts of the high-power switch are separated often burns the watch strap. Contact fingers, causing dama...

AI Technical Summary

Problems solved by technology

[0002] The traditional isolating switch and grounding switch structure are set separately, and the mechanical and electrical interlocking structure between the isolating switch and the grounding switch is complex, which occupies a large volume in the H-GIS combined electrical appliance

Excessive volume of isolating switch and grounding switch is not conducive to the installation and use of H-GIS combined electrical appliances, but also makes H-GIS combined electrical appliances poor in stability and large in size, which affects their normal use

On the other hand, in order to ensure good contact between the two contacts of the high-power switch, several ring-shaped watch strap contacts are usually set in the static contact, but the arc generated when the two contacts of the high-power switch are separated often burns the watch strap. Contact fingers, causing switch damage and scrapping

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