Title :
UHF partial discharge monitoring in GIS and signal processing
Author :
Li, Z.M. ; Feng, Y.P. ; Hen, J. Q C ; Zhang, X.Z.
Author_Institution :
Sch. of Electr. Eng., Xi´´an Jiaotong Univ., China
Abstract :
In this paper the experiments of detection partial discharges in GIS using ultra high frequency technique is described. The sensors are put outside the GIS so they do not bring extra requirements to the fabrication and operation of GIS. Some steps are taken to resist the external noises. The results show that UHF method is effective in detecting PD in GIS and avoiding the disturbance of coronas outside the GIS. Nevertheless very large corona, fluorescent tube or radio frequency noise nearby can still disturb the measurement. A method of signal processing by software is presented in this paper. Through the procedure of signal wavelet transform, signal noise extraction and signal reconstruction, the signal is analyzed to determine the magnitude of PD in GIS and avoid false alarm. And the modulus maxima and their positions gotten from the wavelet transform can be used as the base of PD pattern recognition in GIS
Keywords :
UHF measurement; gas insulated switchgear; insulation testing; partial discharge measurement; pattern recognition; signal reconstruction; wavelet transforms; GIS; UHF partial discharge monitoring; corona; fluorescent tube; multiscale space; pattern recognition; radiofrequency noise; sensor; signal noise extraction; signal processing; signal reconstruction; signal wavelet transform; Corona; Fabrication; Fluorescence; Frequency; Geographic Information Systems; Monitoring; Partial discharges; Resists; Signal processing; Wavelet transforms;
Conference_Titel :
Electrical Insulating Materials, 1998. Proceedings of 1998 International Symposium on
Conference_Location :
Toyohashi
Print_ISBN :
4-88686-050-8
DOI :
10.1109/ISEIM.1998.741686
