Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)
- 2010.06a
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- Pages.124-124
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- 2010
Characteristics of Insulation Failure in High Voltage Motor Stator Windings
고압전동기 고정자 권선의 절연파괴 특성
- Kim, Hee-Dong (KEPCO Research Institute) ;
- Kim, Kyeong-Yeol (KEPCO Research Institute) ;
- Park, Deok-Hyun (Korea South-East Power Co.)
- Published : 2010.06.16
Abstract
Diagnostic tests were performed on six high voltage motors. These tests included ac current, dissipation factor(tan6) and partial discharge(PD) magnitude. The rewind of motor stator insulation at rated voltage is assessed by the results of these tests. After completing the diagnostic tests, the stator windings of motors were subjected to gradually increasing ac voltage, until the insulation punctured. No. 1 and No.2 motors(4.16 kV) failed near rated voltage of 12.3 kV and 14.2 kV, respectively. The breakdown voltage of No.3 and No.4 motors(6.6 kV) was 17.6 kV and 17.8 kV, respectively. These motors are higher that expected for good quality coils in 6.6 kV class motors.