4Suda T, Member S. Frequency characteristics of leakage current waveforms of a string of suspension insulators[J]. IEEE Transactions on Power Delivery, 2005, 20(1): 481-488.
5Naito K, Mizuno Y, Naganawa W. A study on probabilistic assessment of contamination flashover of high voltage Power Delivery, insulator[J]. IEEE Transactions on 1995, 10(3): 1378-1382.