Simulation Analysis of Ferromagnetic Resonance of 10kV Electromagnetic Voltage Transformer

Electromagnetic voltage transformers are usually used as measurement and protection devices in distribution networks with voltage levels of 10kV. The ferromagnetic resonance caused by the nonlinear characteristics of the excitation inductance of the electromagnetic voltage transformer is a common power system accident in the current power grid. Based on the Maxwell 3D module of ANSOFT software, this paper takes the JDZ10-10C1 voltage transformer as the reference model for modeling and simulation. The simulation results show the magnetic flux change of the voltage transformer core and the waveforms of overvoltage and inrush current when ferromagnetic resonance occurs. The amplitude-frequency characteristics of the excitation current are analyzed by Fourier transform. The simulation process further simulates the inductance change of voltage transformer under different voltage levels, which provides a reference for the selection of voltage transformer in engineering practice and has certain reference significance.