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

1975-06-04

1976-08-24

Miller, J D

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

317 27R, 324 83D, 307232, 328133, H02H 326

Patent

active

039769194

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.

REFERENCES:
patent: 3633115 (1972-01-01), Epstein
patent: 3778723 (1973-12-01), Schaefer
patent: 3825768 (1974-07-01), Grygera

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