Analysis of hysteresis loop measurement and Simulink simulation

CAO Hong-tai, HUANG Ru-lin, YAO Ying-ying

(College of Electrical Engineering， Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at the problems of circuit parameters and measurement accuracy of the hysteresis loop, the method to determine RC integrator circuit parameters was put forward. The method was based on the results of the time domain differential equation and Simulink simulation. A group of hysteresis loops were simulated at different voltages according to the transformer model in Simulink. Then, the fundamental magnetization curve was plotted. Compared with the Simulink model curve, the simulation curve was plotted. The error of measurement was estimable and controllable by the circuit parameters. Based on the method, an experiment was designed. The real transformer hysteresis loop was measured, and the method was proved right. The results indicate that the proposed method reveals the circuit parameters and predicts the error of measurement. The method is characterized of high accuracy, and the reference basis of circuit design is provided for hysteresis loop measurement of nonlinear saturable transformer.