Research on Harmonic Response of Voltage Transformers Based on Jiles-Atherton Model

Due to the inherent hysteresis characteristics and saturation characteristics of ferromagnetic materials, it is difficult to accurately establish a simulation model for a voltage transformer. In order to study the harmonic response of voltage transformers considering the hysteresis effect of iron core, a method for studying the harmonic transformation characteristics of voltage transformers is proposed. Based on the Jiles-Atherton model, the voltage transformer model is built. The hysteresis loop of the voltage transformer is measured by the RC integration circuit. The Jiles-Atherton model is used to identify the parameters and replace it into the built-in voltage transformer model. Compared with the harmonic transformation characteristics of the voltage transformer obtained by the experiment, the accuracy of the model is verified. Finally, through the experiment and simulation, the linear relationship between the ratio error of voltage transformer and the harmonic order is obtained. Compared with the traditional voltage transformer model, this model can more accurately reflect the excitation characteristics of the voltage transformer.