| Title |
Assessment of Insulation Condition in Gas Turbine Generator Stator Windings |
| Authors |
김희동(Kim, Hee-Dong) ; 양규현(Yang, Gyu-Hyun) ; 주영호(Ju, Young-Ho) |
| Keywords |
Condition monitoring ; Diagnostics ; Generator ; Insulation testing ; Partial discharge ; Stator winding |
| 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(tanδ), 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. |