Method and apparatus for extinguishing an electric arc in a circ

Details Method and apparatus for extinguishing an electric arc in a circ Method and apparatus for extinguishing an electric arc in a circ

1979-12-20

1982-07-27

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

H01H 3370

Patent

active

043419330

ABSTRACT:
A method and apparatus for extinguishing an electric arc in a circuit breaker is disclosed which is applicable to circuit breakers in which a gaseous extinguishing medium, such as compressed air or sulfur hexafluoride, is used. The apparatus includes a flow resistance element which alters the flow resistance along the stream of extinguishing medium introduced into the region between the electrical contacts of the circuit breaker in which the electric arc is drawn during the opening operation of the circuit breaker. The flow resistance is altered such that the flow resistance in the vicinity of the theoretical stagnation streamline at the outlet of the flow resistance element is less than the flow resistance at the inlet of the flow resistance element. Consequently, the velocity distribution of the gaseous extinguishing medium is altered such that downstream of the flow resistance element the medium has a velocity profile that includes a core flow of relatively high velocity and a casing flow of relatively lower velocity. Sonic surfaces are produced and positioned relative to the separated electrical contacts and the electric arc drawn between the contacts so as to subject a greater portion of the electric arc to a supersonic stream of extinguishing medium than is the case with conventional circuit breakers.

REFERENCES:
patent: 2297818 (1942-10-01), Van Sickle
patent: 2399412 (1946-04-01), Webb

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