XU Yang1, HU Xiao1, YANG Chu-ming2, et al. Field Test Analysis of On-line VHF PD Monitoring for Generators[J]. High voltageapparatus, 2009, 45(2): 48-52+56.
XU Yang1, HU Xiao1, YANG Chu-ming2, et al. Field Test Analysis of On-line VHF PD Monitoring for Generators[J]. High voltageapparatus, 2009, 45(2): 48-52+56.DOI:
An on-line partial discharge monitoring system for generators using very high frequency range was proposed and has been applied to several hydro-plants in Gongzui
Sichuan Province and Chitan
Fujian Provence
ect.In this system
double capacitive couplers are installed close to the HV outlet terminal to obtain the single pulse waveform
and external disturbance can be separated from stator winding partial discharge via software by using the pulse-by-pulse analysis method.The consistent monitoring for a generator in a power plant was performed and failures were detected successfully.Analyses of the failures suggest that the method of trend analysis to statistical parameters is more effective in reflecting the insulation state of a generator