7Fruth B, Niemeyer L. The importance of statistical characteristics of partial discharge data[J]. IEEE Trans. on Electrical Insulation, 1992, 27(1): 60-69.
8IEEE Substations Committee Working Group K4. Partial discharge testing of gas insulated substations[J]. IEEE Trans. on Power Delivery, 1992, 7(2): 499-506.
9Cooke C M. Particle contamination in compressed gas insulation, limitations and contr'ol[C]//First International Symposium on Gaseous Dielectrics. Knoxville, Tennessee: IEEE Dielectrics and Electrical Insulation Society, 1978. 162-189.
10Okabe S, Yamagiwa T, Okubo H. Detection of harmful metallic particles inside gas insulated switchgear using UHF sensor[J]. IEEE Trans. on Dielectrics and Electrical Insulation, 2008, 15(3): 701-709.
