DocumentCode
1899599
Title
National Grid experience with partial discharges in gas insulated substations
Author
Dick, Stuart
Author_Institution
Div. of Technol. of Sci., NGC, Coventry, UK
fYear
1994
fDate
34436
Firstpage
42583
Lastpage
42584
Abstract
The method of PD detection used by NGC is the UHF technique. Capacitive couplers are the most effective sensors. PD sources are located by time-of-flight measurement where signals from couplers on either side are displayed simultaneously on a 2 channel fast Digital Storage Oscilloscope (DSO). Better instrumentation and the collation of a database of transit times through different plant have improved accuracies. With this experience PD sources have been located to within plus or minus 0.5 m and confirmed by inspection. An ultrasonic PD detection system is being used to confirm locations and it is hoped that more precise location will be possible
Keywords
digital storage oscilloscopes; gaseous insulation; partial discharges; substations; waveguide couplers; Digital Storage Oscilloscope; UHF technique; accuracies; capacitive couplers; database of transit times; gas insulated substations; instrumentation; partial discharges; time-of-flight measurement;
fLanguage
English
Publisher
iet
Conference_Titel
Partial Discharges in Gas Insulated Substations, IEE Colloquium on
Conference_Location
London
Type
conf
Filename
297590
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