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이은춘(Eun-Chun Lee),공태식(Tae-Sik Kong),김재철(Jae-Chul Kim),김희동(Hee-Dong Kim) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.7
The on-line partial discharge (PD) in stator windings of air-cooled gas turbine (GT) generator (119.2MVA, 13.8kV) is measured and analyzed in this paper. This generator was designed by global vacuum pressure impregnation (VPI). The generator failed two times at top bar (16T) of phase B in the stator slot. Six epoxy-mica capacitors were installed in three phases of GT generator. On-line PD test was performed on GT generator using turbine generator analyzer (TGA). TGA showed that the normalized quantity number (NQN) and the PD magnitude(Qm) were high in phase B. Internal discharges were generated in phases A, B and C. The trend analysis of NQN and Qm value are obtained in order to monitor the insulation condition in GT generator stator windings. Phases A and C were in good condition. But phase B had deteriorated significantly.
이은춘(Eun-Chun Lee),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.10
When the large-capacity Mold type Transformer was passed through rain, after it was dried and it’s parts were changed, Insulation Diagnosis was made to evaluate the condition of it and decide to recharge. Using the evaluation of Insulation Diagnosis, the urgent decision-making for recharge made blackout time minimum. In this study, it was considered that Insulation Diagnosis for the large-capacity Mold type Transformer is applied to decision-making for reuse of high voltage electric power equipment by analysis of the case study.