A Reactive Energy Transducer with Frequency Compensation
Shoji Kusui, Minoru Kogane, Kiyoshi Sasano Kiyoshi Sasano, Yoshitaka Sakumoto · Japanese Journal of Applied Physics · 1992
Recently the saving of energy has become an important consideration in electric power line systems. One method for saving energy is the reduction of reactive energy loss in electric equipment. Therefore, the measurement of reactive energy is becoming increasingly important. The developed reactive energy transducer is composed of a typical 90° RC phase shifter using an operational amplifier, a multiplier and a DC current to pulse frequency converter of which the output pulses are counted for measurement of the reactive energy. Generally, as the output amplitude of the 90° phase shifter varies with the line frequency, this variation must be compensated for in precise measurement. In the developed reactive energy transducer, the variation of the amplitude of the shifter is compensated for by changing the conversion coefficient of the DC current to pulse frequency converter.