Phase sequence detector for three-phase ac power system

Details Phase sequence detector for three-phase ac power system Phase sequence detector for three-phase ac power system

G - Physics

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G01R 29/16 (2006.01) G01R 29/18 (2006.01) H02H 7/097 (2006.01) H02H 11/00 (2006.01)

Patent

CA 1054225

ABSTRACT The phase sequence of the phase currents supplied by a three-phase AC power supply to a phase- sensitive load (such as a three-phase AC motor( is monitored by developing three phase-displaced, rectangular shaped logic signals, respectively representing the three phase currents, and applying these logic signals to respective ones of the J, C and K inputs of a J-K flip-flop. When the load is correctly connected to the power supply, the phase relationship of the three logic signals will be appropriate to trigger the flip-flop to its set operating state. Any other sequence actuates the flip-flop to its reset state which, in turn, disconnects the load from the power supply.

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