Abstract In order to realize effective and fast insulation diagnosis of water tree aged cross-linked polyethylene (XLPE) cables, this paper investigated the change of conduction current of water tree aged cables in polarization process and analyzed the interface polarization characteristics of “water tree-XLPE” due to the variation of relative dielectric constant and conductivity of water tree region. Water tree aged XLPE cables with different aging time were obtained, and the short-time polarization and depolarization current (PDC) tests were performed on these samples. Conduction currents of aged cables were extracted to analyze the “water tree-XLPE” interface polarization and its impacts on the PDC tests. According to the results, the conductivity of water tree aged cables is nonlinear under different voltages. Conduction currents of aged cables in polarization process increase first and then decay to a stable value, and this trend becomes more obvious as the aging time increases. Analysis shows that the variation of conductivity and the relative dielectric constant in the water tree region lead to the peak value of conduction current of aged cables extracted from PDC tests due to the interface polarization, and this value is larger with more severe deterioration of water tree aged cables.
Yin You,Zhou Kai,Li Shiyu等. Interface Polarization Characteristics of Water Tree Aged XLPE Cables Based on Polarization and Depolarization Current Method[J]. Transactions of China Electrotechnical Society, 2020, 35(12): 2643-2651.
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2020, Vol. 35 
