Title :
National Grid experience with partial discharges in gas insulated substations
Author_Institution :
Div. of Technol. of Sci., NGC, Coventry, UK
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;
Conference_Titel :
Partial Discharges in Gas Insulated Substations, IEE Colloquium on
Conference_Location :
London
