Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1982-06-23
1984-03-27
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200146R, H01H 3370, H01H 3312
Patent
active
044396520
ABSTRACT:
A contact system for a gas blast circuit breaker has a nozzle-shaped fixed first contact piece, a coaxially mounted nozzle-shaped axially movable second contact piece and a movable bridging element common to both contact pieces. Spring biasing serves to urge the end faces of the first and second contact pieces together in the breaker make position. The breaker driving means moves the bridging contact piece out of a position of electrical connection between the first and second contact pieces during the breaking process, before the second contact is separated from the first contact. The arc at breaking is thus drawn only between the first and second contact pieces which are fitted with graphite electrodes to resist burn-off. This protects the current paths which are intended to carry the rated current and the short circuit current in the make position from damage due to arcing. And since the contact elements of the bridging contact piece which transfer the rated current do not participate in guiding the arc, the dielectric strength of the arc gap is increased.
REFERENCES:
patent: 3639712 (1972-02-01), Balmat et al.
patent: 3786215 (1974-01-01), Mauthe
patent: 4015095 (1977-03-01), Bitsch et al.
patent: 4296288 (1981-10-01), Yanabu et al.
Macon Robert S.
Milde Jr. Karl F.
Rodau Andrew G.
Siemens AG
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