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http://dx.doi.org/10.5370/KIEE.2010.59.8.1423

Assessment of Insulation Condition in Gas Turbine Generator Stator Windings  

Kim, Hee-Dong (한전 전력연구원)
Yang, Gyu-Hyun (한전 KPS 기술연구원)
Ju, Young-Ho (한전 전력연구원)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.59, no.8, 2010 , pp. 1423-1428 More about this Journal
Abstract
The results of off-line and on-line diagnostic tests performed on the stator winding of an air-cooled gas turbine(G/T) generator are reported in this paper. Off-line diagnostic tests included measurements of the ac current, dissipation factor(tan${\delta}$), and partial discharge(PD). Six epoxy-mica capacitors were installed in the three phases of G/T generator for performing on-line diagnostic testing with the turbine generator analyzer(TGA). The TGA showed that the normalized quantity number(NQN) and the PD magnitude($Q_m$) were high in phase A of the stator winding. Internal discharges were generated in phases B and C, and slot discharge occurred in phase A. According to the trend analyses of the NQN and $Q_m$ values available for insulation condition assessment for G/T generator stator windings, it was concluded that phases B and C were in good condition, whereas phase A has been significantly deteriorated.
Keywords
Condition monitoring; Diagnostics; Generator; Insulation testing; Partial discharge; Stator winding;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By SCOPUS : 0
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