고압전동기 고정자 권선의 진단시험 주기선정

To assess the insulation condition of stator winding, diagnostic tests were performed on high voltage (HV) motors. Diagnostic tests included insulation resistance, polarization index, ac current, dissipation factor(tanδ) and partial discharge(PD) magnitude. The rewind of HV motor stator windings at rated voltage is assessed by the results of these tests. The insulation diagnosis data of the stator winding were obtained from 7,234 motors with rated voltage of 6.6 ㎸. Korea Electric Power Corporation (KEPCO)has established the periodical diagnostic test for HV motor stator windings.