METHOD FOR THREE-PHASE CIRCUIT MOMENTARY POWER FACTOR MEASURING AND DEVICE FOR ITS REALISATION Russian patent published in 2017 - IPC G01R21/00 

FIELD: electricity.

SUBSTANCE: method includes converting the input signals of instantaneous phase currents and instantaneous phase voltages to instantaneous and full power signals, and then measuring their ratio equal to the instantaneous power factor, characterized in that the receipt of the total power signal is carried out by converting the input signals of instantaneous phase currents and instantaneous phase voltages in the instantaneous values of the current module and the voltage module of the three-phase network with their subsequent multiplication. The device comprises a three-phase network instantaneous power extraction unit and a division unit connected to it, the output of which is the output of the device, characterized in that it further comprises an instantaneous unit of the current imaging vector unit, an instantaneous voltage vector unit of the voltage vector generator, and a multiplying unit. The inputs of the three-phase network instantaneous power selection box are connected to the inputs of the current vector module selection box which are inputs for signals proportional to the instantaneous phase currents of the network and to the inputs of the voltage vector module selection box that are inputs for signals proportional to the instantaneous phase voltages of the network, and the outputs of the selection boxes of the current vector imaging module and of the voltage vector image module are connected to the inputs of the multiplying unit, the output of which together with the output of the instantaneous power selection box of the three-phase network are connected to the inputs of the division unit.

EFFECT: improved accuracy and speed of measuring the instantaneous power factor.

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