抄録
The authors have proposed the resin molded type of voltage-current sensor for the real time observation of the power facter. The sensor has been designed and implemented based on the FEM, however, the current waveform in the 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 conventional jω method but finite-difference approximation on the time derivative term in a transient electromagnetic field analysis using FEM. In the paper, we will show the result of electromagnetic field analysis of the sensor adopting the finite-difference approximation.
