Transient analysis on current sensor of resin molded type for measurement of power factor in power distribution system

Abstract

The authors have proposed the resin molded type of voltage-current sensor for the real-time observation of the power factor. The sensor has been designed and implemented based on the FEM; however, the current waveform and practical power distribution system includes harmonic components due to the inverter-fed power apparatuses in households and factories. Therefore, it is necessary to apply not the conventional jω method but the finite-difference approximation to the time derivative term in a transient electromagnetic field analysis using FEM. In the paper, the authors will show the result of electromagnetic field analysis of the sensor adopting the finite-difference approximation.