Space charge property at the interface in low density polyethylene/ethylene propylene rubber double-layered insulation

作者：Lan, Li^*; Wu, Jiandong; Wang, Yani; Yin, Yi

来源：Proceedings of the CSEE, 2015, 35(5): 1266-1272.

DOI：10.13334/j.0258-8013.pcsee.2015.05.030

• Dielectric insulations
• Double layers
• Ethylene-propylene rubber
• High-field conduction
• Low Density Polyethylene (LDPE)
• Maxwell-Wagner polarization
• Polarization charges
• Space charge properties

The physical interfaces in multilayered dielectric insulation have been identified as weak points of the insulation system with a failure probability much higher than that of the bulk insulation. This paper presents the experimental measurement results of the high field conduction characteristic and space charge distribution in low density polyethylene (LDPE)/ethylene propylene rubber (EPR) double-layered insulation. The results show that the space charge at the interface between LDPE and EPR is due to a combined effect of the Maxwell-Wagner polarization charge and injected electrons from the cathode. The polarity and amount of the polarization charge varies with the applied field, because the conductivity of LDPE and EPR has different field dependence. The accumulation of electronic interfacial charge is formed by the injected electrons passing through the interface and trapped by the deep traps at the surface of EPR.

• 出版日期2015
• 单位上海交通大学