apparatus for the measurement of the active power, reactive power, apparent and factor

摘要

the invention relates to a device for the passage of active, reactive, and apparent power factor in ac three phase circuits.for this purpose the signals representing voltages and currents in the three phases of the line measured are taken through the second blocks entrybettering of electronic transformers offset, and then applied to two blocks of analog calculation of actual value.with the help of five multiplexoare analogue with six entrances, which apply voltages and currents signals representing the instantaneous values and actual, makethrough the second analogue amplitude modulation multiplier in the multiplier and duration, duration of two signals modulator having common intermediateone proportional to s + p, the other with s-p, which is achieved by calculation of analog, power p and appearance to activate, and then with a multiplier extractor radical, reactive power q.the signals p, q and s are applied to a device commandin connection with a converter analog numeric numbers through which is converted into a proportional and display device for active power, reactive,appearance and power factor on line measured.