Arc extinguish chamber for sulfur hexafluoride circuit-breaker

Abstract

The invention discloses an arc extinguish chamber for a sulfur hexafluoride circuit-breaker. The arc extinguish chamber comprises an insulation tube, an upper line outlet seat, a lower line outlet seat, an upper static contact device, a lower static contact device and a moving contact device, wherein the upper line outlet seat is poured at the upper end of the insulation tube; the lower line outlet seat is poured at the middle end of the insulation tube; the upper static contact device is connected with the upper line outlet seat; the lower static contact device is connected with the lower line outlet seat; the moving contact device is arranged in the insulation tube; the moving contact device comprises a spray nozzle, a moving arc contact, a moving main contact, an air cylinder, a support frame and a piston rod; the piston rod is respectively connected with the upper end and the lower end of the support frame and the moving arc contact; the air cylinder is arranged at the upper end of a boss of the support frame and in a sealed air chamber which is formed by the inner wall of the air cylinder, the outer wall of a piston of the lower static contact device, and the outside wall of the piston rod; the static arc contact is in plug-in contact with the moving arc contact; the static arc contact is inserted into the moving arc contact; the moving arc contact is in a rose-shaped structure; and the inside diameter of the moving arc contact is slightly smaller than the outside diameter of the static arc contact. The arc extinguishing chamber for the sulfur hexafluoride circuit-breaker has reliable interruption performance and abundant arcing interval, so that the reliable and safe interrupting can be ensured at different current levels.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing chamber of a sulfur hexafluoride circuit breaker. Background technique [0002] The arc extinguishing chamber is used to limit the arc generated when the circuit breaker is disconnected, and sometimes it can also play the role of auxiliary arc extinguishing. In principle, the root cause of arcing in circuit breakers is that there are a large number of free electrons in the contact itself and the medium around the contact of the switching device. When the arcing contact is disconnected, if there is a large enough voltage between the contacts and When the circuit current reaches the minimum arcing current, the above-mentioned free electrons will be excited to form an arc. The arc formed above not only has a great destructive effect on the contacts, but also prolongs the time for disconnecting the circuit, and the more serious situation is that a safet...

AI Technical Summary

Problems solved by technology

The arc formed above not only has a great destructive effect on the contacts, but also prolongs the time for disconnecting the circuit. In a more serious situation, a safety accident is caused by the arc.

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