Research on theSynthetic Methodfor theDetection and Location ofPD inGIS
Ling-Hui Yang, Jian-Hua Jiang · 2008
Thesynthetic methodfordetecting andlocating PD defects inGISisdeveloped fromtwobasic means:ultra high frequency (UHF)electromagnetic signal detection andacoustic emission (AE)detection. The basicprinciples ofmethod, discharge spectrum, zeroband tracksand time-domain waveform features areexplained. Theactual PD detection and location system forGISequipments isestablished. Ithaswide frequency range, highreal-time sampling rateandlargeflash memory.Itissuitable fortransient burst pulses measurement. Thegradual locating methodisintroduced. Itcomprises two stages: roughlocating andprecise locating. Roughlocating is derived fromtraveling-wave principle. Precise locating uses contour map ofAE rmsvalue.Thegradual locating greatly improves efficiency andaccuracy. Theapplications insubstations andpowerplants showsatisfactory effects ofthis newmethod.