Numerical Electric Field Analysis on Cylindrical type of Voltage Sensor for Measuring Power Factor in Three Phase Power Distribution Systems

摘要

Contactless and real-time measurement of a voltage wave form and a current one in general three phase power distribution systems is indispensable for the maintenance, the control and the stable voltage regulation and has been surveyed and tested. We have investigated the cause of a problem on the phase shifting, which influences on the precise estimation of the reactive power in low power load condition, between the actual voltage wave form and the measured one using the static induction type of the voltage sensor, which this voltage sensor comprises a pair of electrodes to measure the voltage wave form by the electrostatic induction.