DocumentCode :
1018705
Title :
A New Air Circuit Breaker With 250,000-Kva Interrupting Capacity
Author :
Dickinson, R.C. ; Nau, R.H.
Author_Institution :
Circuit-Breaker engineer Westinghouse Electric and Manufacturing Company, East Pittsburgh, Pa.
Volume :
60
Issue :
5
fYear :
1941
fDate :
5/1/1941 12:00:00 AM
Firstpage :
197
Lastpage :
201
Abstract :
Heretofore it has not been commercially feasible to apply air-type breakers of the 5,000-volt class to circuits capable of producing short-circuit currents equivalent to 250,000 kva. However the continued demand for air circuit breakers of higher interrupting ratings has stimulated the development of a new breaker suitable for these applications. This achievement has been accomplished through magnetically enhanced diffusion of ionized particles, establishing dielectric strength in a gaseous region which was previously highly conducting. The interrupter consists essentially of an arc chamber of laterally spaced refractory plates embodying V-shaped slots and a magnetic circuit which imposes an intense magnetic field transverse to the slotted plates during the arcing period. The theory of arc interruption by this new air breaker is considered. Design details are described and illustrated. Complete sets of test results are given, with representative oscillograms. The test results are discussed, and it is demonstrated that the new breaker is applicable to modern metal-clad switchgear.
Keywords :
Circuit breakers; Circuit testing; Dielectric breakdown; Gases; Interrupters; Magnetic circuits; Magnetic fields; Petroleum; Safety; Voltage;
fLanguage :
English
Journal_Title :
American Institute of Electrical Engineers, Transactions of the
Publisher :
ieee
ISSN :
0096-3860
Type :
jour
DOI :
10.1109/T-AIEE.1941.5058313
Filename :
5058313
Link To Document :
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