Title :
On-line partial discharge detection and control on MV cable networks with ground fault neutraliser
Author :
Seltzer-Grant, Malcolm ; Winter, Klaus ; Mackinlay, Ross ; Renforth, Lee
Author_Institution :
HVPD Ltd., Manchester, UK
Abstract :
The technique of controlling neutral voltage and current is applied in medium- and high-voltage electricity networks as a means of eliminating earth fault currents. The complete compensation of earth fault currents is achieved using modern power electronics developed by Swedish Neutral. The GFN Ground Fault Neutralizer uses beside traditional Petersen Coil technology a novel Residual Current Compensator (RCC) to archive a very fast and complete elimination of the earth fault current. Injection of voltage into the transformer neutral using this system, also allows control of the phase-ground voltages under normal operation. This in turn allows partial discharge (PD) activity in the cables and connected plant to be incepted and extinguished through voltage increase and reduction on a phase-by-phase basis, providing a very powerful diagnostic system. The paper presents results from on-line partial discharge (OLPD) testing combined with neutral voltage displacement on MV networks. Case studies are presented from testing with fabricated defects and on two MV networks as part of GFN system commissioning.
Keywords :
electric current control; electrical faults; partial discharges; power cables; voltage control; GFN system commissioning; MV cable networks; OLPD testing; Swedish neutral; diagnostic system; earth fault currents; ground fault neutraliser; neutral current control; neutral voltage control; neutral voltage displacement; online partial discharge control; online partial discharge detection; partial discharge activity; phase-by-phase basis; phase-ground voltages; power cables; power electronics; residual current compensator;
Conference_Titel :
Electricity Distribution (CIRED 2013), 22nd International Conference and Exhibition on
Conference_Location :
Stockholm
Electronic_ISBN :
978-1-84919-732-8
DOI :
10.1049/cp.2013.1191