DocumentCode :
938723
Title :
Condition assessment of contacts in gas-insulated substations
Author :
Runde, Magne ; Lillevik, Odd ; Larsen, Vegard ; Skyberg, Berit ; Mjelve, Asgeir ; Tonstad, Askjell
Author_Institution :
Norwegian Univ. of Sci. & Technol., Trondheim, Norway
Volume :
19
Issue :
2
fYear :
2004
fDate :
4/1/2004 12:00:00 AM
Firstpage :
609
Lastpage :
617
Abstract :
A new method for assessing the condition of electric contacts and joints inside gas-insulated substations (GISs) that overcomes the limitations of conventional diagnostic methods is proposed. The contact resistance in degraded or overstressed electrical contacts varies slightly when currents of different amplitudes are passed. The diagnostic method is based on detecting this nonlinear behavior. For testing of the contacts in large GIS, excitation currents up to several thousand amperes are required. By using a capacitor-based current supply, such currents can be achieved with a portable source. The testing can be carried out without dismantling the GIS. No earlier measurements or manufacturer specifications are required. In full-scale testing under realistic operating conditions on 145-420 kV GIS using prototype instrumentation a very good sensitivity for detecting contact degradation in an early stage was obtained.
Keywords :
contact resistance; electrical contacts; fault diagnosis; gas insulated substations; capacitor based current supply; contact degradation; contact resistance; electric contacts; fault diagnosis; gas insulated substations; nonlinear behavior; testing equipment; Condition monitoring; Conductors; Contact resistance; Degradation; Electrical resistance measurement; Geographic Information Systems; Insulation; Manufacturing; Substations; Testing;
fLanguage :
English
Journal_Title :
Power Delivery, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8977
Type :
jour
DOI :
10.1109/TPWRD.2003.822942
Filename :
1278417
Link To Document :
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