Abstract
The statistical parameters of phase resolved partial discharge (PD) distribution and ultra-wideband (UWB) characteristics of PD pulse are proposed for aging assessment of large generator insulation. Multi-stress aging tests of the model generator stator bar specimens were performed and PD measurements were conducted using both digital PD detector with frequency ranging from 40 kHz to 400 kHz and UWB PD detector with bandwidth from 10 MHz to 3 GHz at different aging stages. The test results show that the skewness and UWB frequency characteristics of PD can be taken as the characterization parameters for aging assessment of generator insulation. Furthermore, the measurement results of real generator stator bars show that these methods based on statistical parameters and UWB characteristics of PD are prospective for aging assessment and residual lifetime estimation of large generator stator insulation.
| Original language | English |
|---|---|
| Pages (from-to) | 1035-1043 |
| Number of pages | 9 |
| Journal | Progress in Natural Science |
| Volume | 15 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 2005 |
Keywords
- Aging assessment
- Multi-stress accelerated aging
- Partial discharge
- Statistical parameters
- Stator insulation
- Ultra-wideband