Novel arc extinguishing contact structure of high-voltage switch SF6 gas arc extinguishing chamber

Abstract

The invention discloses a novel arc extinguishing contact structure of a high-voltage switch SF6 gas arc extinguishing chamber. The novel arc extinguishing contact structure comprises a static arc contact and a moving end contact. The static arc contact with a variable radius is adopted, a main nozzle is blocked in a pre-compression stage, and the pressure of an air cylinder is rapidly established, so that when electric arcs begin to appear, the nozzle becomes smooth immediately. Holes are additionally formed in the air cylinder, high-temperature electric ions are cooled through a siphon principle, circular flow of gas is achieved, long arcing extinguishing of electric arcs is accelerated, and therefore the better arc extinguishing performance is achieved. A flow guide cone and a flow diffusion cover which are additionally arranged can prevent thermoelectric ions from rebounding to a high-potential area to cause breakdown discharge of a shell or a basin, and the better safety performance is achieved.

Description

technical field [0001] The invention relates to a novel arc-extinguishing contact structure of an SF6 gas interrupter for a high-voltage switch. Background technique [0002] The circuit breaker is a core component responsible for control and protection in the high-voltage power system. The SF6 gas interrupter is a key module of the high-voltage switch circuit breaker. Its main function is to contact the dynamic and static contacts in the SF6 gas. And relative movement, using the flow of SF6 gas, quickly reduce the arc temperature, accelerate the arc extinguishing, in order to achieve the purpose of high voltage switch opening operation. [0003] At present, the traditional arc extinguishing chambers on the market use the cooperation of the static contact and the moving contact part to realize the breaking current. This breaking method leads to the contradiction of the throat diameter of the nozzle when breaking different fault currents. The nozzle throat diameter is used t...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional arc extinguishing chambers on the market use the cooperation of the static contact and the moving contact part to realize the breaking current. This breaking method leads to the contradiction of the throat diameter of the nozzle when breaking different fault currents. The nozzle throat diameter is used to break different fault currents, the cost is high and the versatility is poor, and different fault currents cannot be used universally

In order to enhance the arc-extinguishing ability of some products, the commonly used method is to lengthen the opening distance and increase the opening speed per unit time, etc., which will reduce the stability of the product and lead to an increase in product cost

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