To assess the deterioration condition of stator insulation, diagnostic and overpotential tests were performed on two high voltage(HV) motors for circulating water pump (CWP). Following the long term rewinding program, the diagnostic test was performed on two motors during the planning maintenance period. After completing the diagnostic test, overpotential test was done on the stator windings of HV motors. During the overpotential test, the No. 1 and No. 2 of HV motors failed at 8.8 kV and 7.9 kV, respectively. Stator windings of two HV motors had deteriorated significantly.
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