6Li Q, Zhao T, Slew W H. Definition and digital algorithms of dielectric loss factor for condition monitoring of high- voltage power equipment with harmonics emphasis[J].Generation,Transmission and Distribution, 2005,152(3): 309-312.
7Djokic B, So E. Phase measurement of distorted periodic signals based on nonsynchronous digital filtering[J]. IEEE Transactions on Instrumentation and Measurement, 2001, 50(4): 864-867.
8Allan D, Blundell M, Boyd K et al. New techniques for monitoring the insulation quality of in-service HV apparatus[J]. IEEE Transactions on Electrical Insulation, 1992, 27(3): 578-581.
9Wang Pei, Raghuveer M R, McDermid W et al. A digital technique for the on-line measurement of dissipation factor and capacitance[J]. IEEE Transactions on Dielectric and Electrical Insulation, 2001, 8(2):228-232.