Characteristic Analysis of PD Occurrence Aspects for Defect of Stator Coil in HV Induction motor

고압 유도전동기 고정자권선의 결함에 따른 부분방전발생양상의 특징분석

High voltage induction motor is the important equipment for ensuring the driving performance of the electric train. PD(partial discharge) is a good indicator for showing the insulation performance of stator coil in HV induction motor. This paper has investigated the characteristics of PD occurrence aspects for both the sound and defective stator coil which consist of maximum PD amplitude(V), total occurrence number, average PD amplitude(V) and PD amplitude(v) - PD occurrence number(n). They were compared with each other depending on applied voltages and reconstructed to $60{\times}60$ matrices of PD amplitude(v)-occurrence phase (${\phi}$)-occurrence number(n) which is the good way to estimate the PD sources in stator coil.