Locating local insulation defects in disconnected electric motors

摘要

Evolution of the method for identification of local electric insulation defects in windings of disconnected AC electric motors is summarized. To locate a local defect, the paper suggests to use a resistance calculated based on the parameters of a transient of discharge of preliminary charged cable capacitances. To locate a ground fault in the electric motor stator winding, frequency of the voltage between phases is used.