Partial discharge diagnostics for gas insulated substations

Author

Pearson, J.S. ; Farish, O. ; Hampton, B.F. ; Judd, M.D. ; Templeton, D. ; Pryor, B.M. ; Welch, I.M.

Author_Institution

Strathclyde Univ., Glasgow, UK

Volume

2

Issue

5

fYear

1995

fDate

10/1/1995 12:00:00 AM

Firstpage

893

Lastpage

905

Abstract

A defect such as a free metallic particle or stress-raising edge on an electrode could lead to breakdown in a gas insulated substation (GIS), but may be detected by the partial discharges it generates. Of the various detection means available, most success has been achieved with either acoustic transducers to detect sound waves from the discharge, or electrical couplers to pick up the ultra-high-frequency (UHF) signals generated inside the GIS chambers. All new GIS in the UK are fitted with internal couplers for UHF monitoring, and two examples of continuous monitoring schemes on 400 kV GIS at nuclear power stations are described. Further developments, which are already well advanced, include specifying and measuring the coupler characteristics, making use of expert systems to interpret the UHF discharge data, and extending the monitoring system to include the performance of circuit breakers and other equipment

Keywords

UHF couplers; UHF measurement; gas insulated substations; nuclear power stations; partial discharges; power system measurement; 400 kV; UHF discharge data; UHF monitoring; UHF signals; continuous monitoring schemes; electrical couplers; expert systems; gas insulated substations; nuclear power stations; partial discharge diagnostics; Acoustic signal detection; Acoustic transducers; Couplers; Electric breakdown; Electrodes; Gas insulation; Geographic Information Systems; Monitoring; Partial discharges; Substations;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.469984

Filename

469984