Circuit-breaker having low self-compression

Details Circuit-breaker having low self-compression Circuit-breaker having low self-compression

1995-05-15

1997-02-04

Scott, J. R.

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

Air-current blowout

218 59, H01H 33915

Patent

active

056001118

ABSTRACT:
A circuit-breaker including two arcing contacts that co-operate with each other, at least one of which is part of a moving contact assembly that is secured to a drive member and that is constituted by a first tube carrying the moving arcing contact at its end, and by a second tube that is coaxial with the first tube so as to define firstly an expansion chamber on one side of an annular wall, and secondly a compression chamber on the other side of the annular wall, the compression chamber being closed by a piston. A compression device is provided for compressing the gas in the compression chamber during a first portion of the displacement of the moving contact assembly, and a pressure-reducing device is provided for reducing the pressure of the gas in the compression chamber during a second portion of the same displacement of the moving contact assembly. The compression device comprises the fixed piston that co-operates with the first tube over a certain travel distance x, and the pressure-reducing device includes a device for exhausting the gas contained in the compression chamber from the compression chamber, and which operates once the distance x has been travelled.

REFERENCES:
patent: 4650941 (1987-03-01), Thuries et al.
patent: 4650942 (1987-03-01), Perret
patent: 4983791 (1991-01-01), Thuries et al.
patent: 4996399 (1991-02-01), Thuries et al.
patent: 5079392 (1992-01-01), Tsukushi et al.
patent: 5105058 (1992-04-01), Perret
patent: 5160818 (1992-11-01), Dufournet et al.

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