Vacuum arc-extinguishing chamber for self pressure equalizing type multi-break vacuum circuit breaker

Abstract

The invention belongs to the field of high-voltage vacuum switches and relates to a vacuum arc-extinguishing chamber for a self pressure equalizing type multi-break vacuum circuit breaker. The vacuumarc-extinguishing chamber comprises an upper end cover, a static contact, a BST (Barium Strontium Titanate) ceramic shell, a shielding cover, a moving contact, a corrugated pipe shielding cover, a corrugated pipe and a lower end cover, wherein the BST ceramic shell is of a columnar hollow structure; the upper end cover and the lower end cover are respectively connected with the upper end and the lower end of the BST ceramic shell in a sealed manner to form a vacuum sealed space; the shielding cover is arranged inside the BST ceramic shell; the static contact is connected with the lower end surface of the upper end cover; the lower end shaft of the moving contact penetrates through the lower end cover; the lower end shaft is sleeved by a corrugated pipe connected with the lower end cover. By adopting the multi-break vacuum circuit breaker consisting of the self pressure equalizing type vacuum arc-extinguishing chamber, uniform distribution of voltages of multiple breaks can be achieved,the break opening capability of the multi-break vacuum circuit breaker can be improved, and the vacuum arc-extinguishing chamber for the self pressure equalizing type multi-break vacuum circuit breaker is simple in structure and convenient to achieve.

Description

technical field [0001] The invention belongs to the field of high-voltage vacuum switches, and relates to a vacuum interrupter for self-equalizing multi-fracture vacuum circuit breakers. technical background [0002] Using multiple fractures in series is an effective measure to avoid the saturation effect of the vacuum gap and promote the vacuum circuit breaker to a high voltage level. The voltage distribution between the fractures has an important impact on the overall insulation strength and breaking capacity of the circuit breaker, and the withstand voltage between the fractures has a great relationship with its equivalent self-capacitance value. Due to the existence of stray capacitance, even if a double-break vacuum circuit breaker composed of two identical commercial vacuum interrupters is used, the voltage on the high-voltage side fracture is higher than that of the low-voltage side fracture. Generally, in a double-break vacuum circuit breaker, the high-voltage side ...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a vacuum interrupter for a self-equalizing multi-fracture vacuum circuit breaker, which solves the problem that the voltage between each fracture cannot be uniformly distributed under the condition of no voltage equalizing capacitor, and improves multiple Breaking capacity of vacuum circuit breaker

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