局放Diagnostic of HVDC systems using partial discharges.pdfVIP

IEEE Transactions on Dielectrics and Electrical Insulation Vol. 18, No. 1; February 2011 275 Diagnostic of HVDC Systems Using Partial Discharges Andrea Cavallini, Gian Carlo Montanari University of Bologna, Dept. of Electrical Engineering Viale Risorgimento 2, 40136 Bologna, Italy Marco Tozzi TechImp Spa Viale Toscana 11/c, 40069 Zola Predosa, Italy and Xiaolin Chen State Key Lab of Electrical Insulation and Power Equipment, Xian Jiaotong University No. 28 Xianning West Road, Xi’an, Shaanxi 710049, China ABSTRACT This paper presents a methodology for the diagnosis of HVDC systems based on partial discharge analysis. In particular, the characteristics of partial discharge phenomena from different test objects are highlighted, with the aim of providing tools enabling automatic identification of the type of PD, as well as noise and disturbance rejection, for on-line and/or off-line PD testing of HVDC equipments. The results show that, using a fuzzy identification system based on higher-order moments of the PD magnitude and inter-time distributions, corona phenomena can be identified easily, whereas it is sometimes difficult to distinguish between internal and surfa