8Cavallini A, Conti M, Montanari G. C, et al. PD infer- ence for the early detection of electrical treeing in insulation sys- tems [ J ]. IEEE Transactions on Dielectrics and Electrical Insula- tion,2004,11 (4) :724 - 735.
10Li Liwei, Zou Jiyan, Sun Hui. Research and Realization on the DC System Grounding Fault Detector, 6th International Symposium on Test and Measurement, Dalian, China, 2005 ( 8 ) : 7444 - 7447.