Research of the diagnostic features influence on the technical condition of the interphase and winding insulation of electric motors

Abstract

Simulation models of measuring phase currents as a function of insulation leakage current are proposed to determine the dependencies between the leakage current through the interphase insulation and phase currents and to determine the parameters with which the winding defect correlates. A functional analysis of the factors influencing the occurrence of defects in the winding and interphase insulation of electric motors was carried out and the probability of their failure in the event of such defects was determined. It was found that high values of the correlation coefficients indicate a functional connection between the leakage current through the interphase insulation and the phase currents, as well as between the phase shift of current and voltage and the winding insulation of electric motors. It was found that for electric motors, the probability of interphase insulation defects in the presence of a difference in phase currents is about 0.33, and the probability of defects in the winding insulation in the presence of a difference in phase currents and a difference in phase shifts between current and voltage is close to 0.75. The obtained results can be used in the development of models of diagnostic systems for monitoring the condition and prevention of insulation damage and preventing emergencies associated with its violations.