Study on UHF Method for GIS Partial Discharge Detection
Qiu Yu-chang · Gao dianya jishu · 2004
The UHF broad-band and narrow-band methods for GIS partial discharge detection were studied in this paper. The advantage and disadvantage of these two methods are also analyzed. Three common defects (protrusion on busbar, barrier surface contamination, voids in barrier) in GIS are simulated in laboratory, and the PD caused by these defects are detected by UHF broad-band method and narrow-band method respectively. The time domain waveforms of the same defect gotten by the UHF narrow-band method have similar distribution characteristic and those of different defects have different ones, which can be used to recognize the type of PD. So it is pointed out that the UHF narrow-band method is more convenient for pattern recognition.