고압전동기 운전중 부분방전 추이 분석

During normal machine operation, partial discharge(PD) measurements were performed with turbine generator analyzer(TGA) in two high voltage motors(rated 6.6 ㎸). These high voltage motors were installed with 80 pF capacitive couplers at the terminal box. TGA summarizes each plot with two quantities such as the normalized quantity number(NQN) and the peak PD magnitude (Qm). The trend analyses of NQN and Qm value are available for monitoring of the insulation condition in stator windings of high voltage motors.