Investigation of inter-turn fault in transformer winding using discharge method

Abstract

The paper presents the results of an analysis of the inter-turn fault effects on the voltage and current waveform of the capacitor discharge through transformer winding. The research was done within the FAIR project for which a measuring and diagnostic system for testing the condition of electrical circuits of superconducting electromagnets system is being developed. Appropriate measurements and simulations of special transformer system were made to verify the proposed diagnosis method. A mathematical model was developed considering the nonlinearity and hysteresis of the transformer magnetic core. The special test bench was made to emulate the inter-turn faults in transformer windings.