DocumentCode :
771018
Title :
The excitation of UHF signals by partial discharges in GIS
Author :
Judd, M.D. ; Farish, O. ; Hampton, B.F.
Author_Institution :
Centre for Electr. Power Eng., Strathclyde Univ., Glasgow, UK
Volume :
3
Issue :
2
fYear :
1996
fDate :
4/1/1996 12:00:00 AM
Firstpage :
213
Lastpage :
228
Abstract :
The fundamental theory of the UHF method for detecting partial discharge (PD) in gas insulated substations (GIS) is presented. The effects of position, size, current amplitude and pulse shape of the PD source on the UHF signal can be predicted using this theory. Excitation of propagating electromagnetic waves by a PD current pulse within the coaxial waveguides formed by GIS components is explained by making use of dyadic Green´s functions for the electric fields of propagating modes. Experiments with a coaxial test chamber are used to verify the theoretical predictions, and comparisons are made between measured and simulated UHF signals. Some implications for the UHF measurement of PD are discussed, together with positioning and sensitivity requirements for UHF couplers. A scheme is proposed for standardizing PD measurements made using the UHF technique
Keywords :
Green´s function methods; UHF measurement; coaxial waveguides; gas insulated substations; insulation testing; partial discharges; power system measurement; GIS; PD current pulse; UHF couplers; UHF measurement; coaxial waveguide; dyadic Green functions; electromagnetic wave propagation; gas insulated substation; partial discharges; signal excitation; Coaxial components; Electromagnetic propagation; Electromagnetic waveguides; Gas insulation; Geographic Information Systems; Partial discharges; Pulse shaping methods; Shape; Substations; UHF measurements;
fLanguage :
English
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
1070-9878
Type :
jour
DOI :
10.1109/94.486773
Filename :
486773
Link To Document :
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