Analysis of the Influence of Remanence on the Performance of Current Transformer Caused by DC Ice Melting of Transmission Lines

Abstract

Abstract This paper theoretically analyzes the performance changes of the measuring winding and protective winding of the current transformer behind the iron core of the DC ice melting current magnetized transformer. According to the actual ice melting situation, a finite element simulation model is established to calculate the electromagnetic field distribution inside the transformer, quantify the remanence generated by the ice melting, and design a verification test to measure the remanence and transmission characteristics of the current transformer after the ice melting current is magnetized. Based on theory, simulation, and experiment, suggestions for the treatment after ice melting are put forward.