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1935 - impulse oil circuit breaker for the line between Boulder Dam and Los Angeles

IMPULSE OIL CIRCUIT BREAKER

CD 2487092 E&MP15.011

Electric Circuits, Breakers

March 25, 1935

Inspection after a series of successful tests of a General Electric 2,500,000-kv-a., 287,500-volt, 60-cycle, impulse oil circuit breaker for the line between Boulder Dam and Los Angeles.

The breaker shown is a single pole of the eight triple-pole breakers being tested for the Department of Water and Power of the City of Los Angeles.

It is the highest voltage breaker ever manufactured for commercial use, and has a rated operating time of not more than three cycles on a 60-cycle basis.

In this type of breaker the oil is driven across the arc path under pressure from a piston actuated by the operating mechanism.

This results in extremely rapid and positive interruption.

It contains about 20,000 gallons less oil than conventional tank-type breakers, and in the interrupting elements there is only 10 percent of the oil content, which means an appreciable saving in oil maintenance costs.  


Original Caption by Science Service
General Electric



National Museum of American History

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