A gas circuit breaker with enhanced insulation recovery function

Abstract

The invention discloses a gas circuit breaker with a reinforced insulation recovery function. An expansion chamber, a compressed gas chamber, a main nozzle, an auxiliary nozzle, a moving side arc contact and a static side arc contact constitute an arc breaking core component. An arc extinguishing chamber is composed of an inner mixing area and an outer mixing area. Drainage holes of guide cylinders draw insulating gas in the outer mixing area of the arc extinguishing chamber into the inner mixing area of the arc extinguishing chamber, and the insulating gas and arc high-temperature gas are mixed at a first level and cooled in an area closest to a fracture. Drainage holes of a support base draw insulating gas outside the arc extinguishing chamber into the outer mixing area of the arc extinguishing chamber, and the insulating gas and arc gas are mixed at a second level and cooled. Spoilers at exhaust ports reduce the local velocity of high-temperature mixed gas exhausted. A pressure balance hole is arranged in a main contact shielding cover, which reduces the pressure difference between the two sides of the shielding cover. A pressure balance hole is arranged in an insulating cylinder, which reduces the fluctuation of gas pressure inside the insulating cylinder.

Description

technical field [0001] The invention relates to the field of gas circuit breakers, in particular to a gas circuit breaker with enhanced insulation recovery function. Background technique [0002] The working principle of the high-voltage gas circuit breaker is to quickly cool and effectively discharge the arc gas generated during the current breaking process, so that the entire device can quickly recover and maintain a good electrical insulation state. The arc gas has the characteristics of high temperature, high pressure and poor insulation ability. It must be precisely designed for the flow field of the circuit breaker to ensure that the circuit breaker can be cooled rapidly and the insulation ability can be restored. [0003] The usual circuit breaker arc gas discharge design adopts the gas buffer design method, that is, a certain volume of gas buffer is set downstream of the arc gas, a certain amount of insulating gas is pre-stored, and an array of small holes is arrange...

AI Technical Summary

Problems solved by technology

When the current is interrupted, the rapid movement of the cylinder in the arc extinguishing chamber will cause a large instantaneous fluctuation of the gas pressure inside the insulating cylinder, resulting in a short-term drop in insulation capacity

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