Interfacial Charge Dynamics of XLPE/EPDM Double Layers by Simultaneous Measurement of Space Charge and Relaxation Current

被引:12
作者
Wang, Yani [1 ]
Wang, Yalin [2 ]
Yang, Xingwu [1 ]
Ma, Aiqing [1 ]
Yin, Yi [2 ]
机构
[1] Shanghai Univ Elect Power, Coll Elect Power Engn, Shanghai 200090, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Elect Informat & Elect Engn, Dept Elect Engn, Shanghai 200240, Peoples R China
基金
中国博士后科学基金; 上海市自然科学基金;
关键词
interfacial charge; XLPE/EPDM double layers; simultaneous measurement; space charge; relaxation current; BEHAVIOR; TEMPERATURE; CONDUCTION;
D O I
10.1109/TDEI.2020.009274
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Simultaneous measurement at various temperatures of space charge and relaxation current is performed on cross-linked polyethylene (XLPE)/ethylene-propylene-diene monomer (EPDM) double layers with and without silicone grease. The simultaneous measurement correlates the charge distribution and current information for the same sample and avoids discrepancy, due to the separate measurement on different samples. It is found that the polarity of interfacial charges change to the opposite with the increase in temperature in most samples, which is related to both Maxwell-Wagner polarization and enhanced charge injection and migration at higher temperatures. Bipolar charges appear in the vicinity of interface in some XLPE/EPDM double layers with silicone grease. This phenomenon can be explained by Maxwell-Wagner polarization at two interfaces of XLPE/silicone grease and EPDM/silicone grease. The addition of silicone grease decreases the conductivity of XLPE/EPDM double layers. Based on the proposed three-component exponential decay model, it is found that the interfacial charge movement affects the polarity of induced relaxation current, and the addition of silicone grease decreases the interface trap depth.
引用
收藏
页码:576 / 584
页数:9
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