Identification and solution of EMI influences on transformer windings temperature measurement

Abstract

In power electronic devices, the winding temperature of the transformer in operation needs to be monitored in real time. But the Electromagnetic Interference(EMI) problems cause the measured winding temperature fluctuates anomalously. In this paper, the 10MVA transformer in the cabinet of a transformer rectifier is studied as a specific case, the temperature measurement circuit of the transformer winding is introduced, according to which the causes of winding temperature fluctuation is analyzed. Finally, the solution of the winding temperature fluctuation is proposed and verified by experiments.