Novel single-fracture single-cylinder self energy high pressure sulfur hexafluoride breaker arc extinguish chamber

Abstract

The invention discloses a novel single-fracture single-cylinder self energy high pressure sulfur hexafluoride breaker arc extinguish chamber, comprising a static contact mechanism and a moving contact mechanism which are used in a matching way, a moving contact seat and an insulating tension pipe driving the moving contact mechanism to carry out on and off operations up and down; wherein the moving contact mechanism is axially arranged in the cylinder and is driven by the cylinder to carry out on and off operations, the static contact mechanism, the moving contact mechanism and the moving contact seat are axially arranged in an arc extinguish ceramic sleeve from up to down, the inner diameter of the cylinder is 40-50% less than that of a compressed air SF6 breaker cylinder, and the cylinder is a pneumatic cylinder with residual capacity in the interior after off operation of the moving contact mechanism. The invention has reasonable structure design, simple use operation and good use effect, and can realize triplex functions of the cylinder being used as a compressed air chamber and a thermal expansion chamber and remaining reasonable residual capacity, so that the self energy sulfur hexafluoride breaker can utilize electric arc energy to help extinguish the electric arc when in heavy cut-off current, thus greatly reducing operation power.

Description

technical field [0001] The invention belongs to the technical field of high-voltage switchgear, and in particular relates to a novel single-fracture single-cylinder self-energized high-voltage sulfur hexafluoride circuit breaker arc extinguishing chamber for a 126-252kV self-energized SF6 circuit breaker capable of breaking 40kA-50kA current . Background technique [0002] At the end of the 20th century, high-voltage SF6 circuit breakers using sulfur hexafluoride (SF6) gas with excellent insulation and arc-extinguishing properties as the medium replaced oil-less circuit breakers and air circuit breakers, and were widely used in power systems. The compressed air SF6 circuit breaker that is used more has the advantages of small size, strong breaking capacity, long electrical life, safety and reliability, etc., but the compressed air SF6 circuit breaker needs a hydraulic or pneumatic operating mechanism with a large operating power. According to the statistics of the power dep...

AI Technical Summary

Problems solved by technology

Therefore, at the beginning of the 21st century, the developed countries in the world devoted themselves to the study of high-voltage self-energy SF6 circuit breakers that use arc energy to help the arc extinguish when breaking large currents, thereby greatly reducing the operating work.

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