Controller for automatic transfer switches

Details Controller for automatic transfer switches Controller for automatic transfer switches

1996-02-07

1998-04-14

Elms, Richard T.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 66, 307 87, 307126, 307127, 307141, 361 44, 361 45, H02J 342

Patent

active

057395942

ABSTRACT:
A microprocessor controlled automatic transfer switch is provided with an improved voltage sensing scheme which utilizes an open-delta transformer and a control routine for determining voltage level or phase loss. The invention requires only two transformers for sensing three-phase power. An actuator protection feature is also provided to limit the duration of power applied to and to protect the actuator solenoids on the automatic transfer switch. Also provided are improved diagnostic annunciation features which provide specific information regarding switch position and sensing element and/or actuator malfunction.

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patent: 5182464 (1993-01-01), Woodworth et al.
patent: 5210685 (1993-05-01), Rosa

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