Controller for automatic transfer switches
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United States of America Patent
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Apr 14, 1998
Grant Date -
N/A
app pub date -
Feb 7, 1996
filing date -
Feb 7, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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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