Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1981-10-29
1983-12-13
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200148A, 200149B, H01H 3370, H01H 3310
Patent
active
044206623
ABSTRACT:
A compressed-gas circuit breaker possesses two contact members (1, 2), which move relative to one another, and a nozzle (7), which is made of dielectric material and is attached to a first (2) member of the two contact members. The constriction (8) of the nozzle (7) which is made of dielectric material, separates a compression-space (9) from an expansion-space (15), and the compressed gas used for extinguishing the arc which occurs on operating the circuit breaker flows through this constriction. An insert (13), designed in the shape of an annulus, is provided at the nozzle constriction (8). The design of the nozzle (7), which is made of dielectric material, is such that it can be exposed to a high thermal loading in the region of its constriction, while, at the same time, high voltages can be held in the breaker-gap, without the occurrence of instances of arcing-over. This object is achieved by arranging the insert (13) to be electrically isolated with respect to the two contact members (1, 2) the insert exhibits a first capacitance with respect to the first contact member (2) and a second capacitance with respect to the second contact member (1). The magnitudes of the capacitances are chosen, by suitable arrangement and dimensioning of the insert (13), so that the electric field in the region of the nozzle constriction (8) is displaced at least partially from the surface of the nozzle, into the compression-space (9) and into the expansion-space (15).
REFERENCES:
patent: 3639712 (1972-02-01), Balmat et al.
patent: 3665134 (1972-05-01), Fischer
patent: 4256940 (1981-03-01), Kii
Niemeyer Lutz
Ragaller Klaus
BBC Brown Boveri & Company Ltd.
Macon Robert S.
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