Medium-voltage gas circuit-breaker

Details Medium-voltage gas circuit-breaker Medium-voltage gas circuit-breaker

1990-08-17

1993-01-12

Logan, Sharon D.

Electricity: circuit makers and breakers

Liquid contact

Time delay

H01N 3382, H01N 3388

Patent

active

051792575

ABSTRACT:
A medium-voltage circuit-breaker comprises a sealed enclosure filled with a dielectric gas and containing a semi-fixed first contact electrically connected to a first terminal and a mobile second contact electrically connected to a second terminal and mechanically coupled to an operating member. The semi-fixed contact is associated with a piston moving in a first cylinder constituting a first volume and provided at one end with a nozzle in which the mobile contact can be inserted when the circuit-breaker is in the engaged (on) position. The piston is acted on by a spring urging it in the direction in which the first volume decreases. The circuit-breaker comprises a system for causing the gas to circulate automatically between the first volume and a second volume when the current to be interrupted reaches a predetermined threshold value. The semi-fixed contact is a tube communicating with a third volume consisting of the remainder of the enclosure.

REFERENCES:
patent: 4327263 (1982-04-01), Sakurai et al.
patent: 4471188 (1984-09-01), Van et al.
patent: 4517425 (1985-05-01), Martin

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