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Detection of parallel discharges in gas insulated substations

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3 Author(s)
Bargigia, A. ; ENEL-CREL, Cologno Monzese, Italy ; Koltunowicz, W. ; Pigini, A.

Four methods for partial discharge (PD) detection in gas-insulated substations were considered. Laboratory tests were carried out to determine the efficiency of these methods to detect defects and to discriminate among different defect types. The sensitivity of the methods is compared and the applicability of the methods in the field is discussed. In the laboratory the standard PD measuring method showed a good sensitivity to defects. In the field condition the standard PD measuring method can have a sensitivity much lower than in laboratory, due to the rather high noise level expected. In the laboratory two of the alternative PD detection methods (namely the acoustic method and electrical method including a field probe inside the GIS) have shown a sensitivity to fixed-type defect discharges, while showing less efficiency relative to the mobile particles considered in the study

Published in:

Power Delivery, IEEE Transactions on  (Volume:7 ,  Issue: 3 )

Date of Publication:

Jul 1992

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