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1935 - biggest and highest voltage ground fault neutralizer in the United States and possibly in the world at Boulder Dam

BIGGEST GROUND FAULT NEUTRALIZER

CD 1966074 E&MP33.001

Electric Power

1935

Biggest and highest voltage ground fault neutralizer in the United States and possibly in the world is the tank-like device in the center of this picture.

It was installed recently by General Electric engineers at Boulder Dam in the 230,000-volt line of the Southern California Edison Co., Ltd., to help prevent interruptions to service due to lightning, birds, winds or sleet storms.

As long as only one line of the three-phase system is affected by a line to ground fault, the device can neutralize it without the lights in a power user's home so much as flickering.

Southern California Edison also has ground fault neutralizers in its Chino and Barre substations in California. 


Original Caption by Science Service
General Electric



National Museum of American History

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