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In the insulation system of DC cable accessories, the interface between different materials is of vital importance for thier insulating performance. The silicone rubber (SiR)/cross-linking polyethylene (XLPE) interface is considered to be a weak part of the cable systems. The charge is easy to accumulate at interface, leading to the distortion of electric field and degradation of the interfacial insulating performance. The accumulation of charges at the interface is affected by the polarization of the interface and the injection of charges. Therefore, in this paper, the conduction and space charge characteristics of SiR/XLPE bi-layer dielectric specimens are investigated. Firstly, high field conduction and space charge experiments were conducted on SiR/XLPE bi-layer specimens. The transition field of SiR/XLPE bi-layer dielectric specimens was obtained. In addition, the charge injection characteristics of SiR and XLPE specimens under the transition field were also studied. Finally, the interfacial charge polarity was verified using the Maxwell-Wagner interface polarization model. The results provide references for improving the service life of DC cable accessories.

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Conductivity and Space Charge Characterization of SiR/XLPE Bi-Layer Dielectrics

  • 会议论文

  • 发表日期：

    2026年

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  • Wenxin Zhong,
  • Haoran Sui,
  • Tianxiang Kang,
  • Huachun Li,
  • Zehua Pan,
  • Kangning Wu,
  • Jianying Li

摘要

In the insulation system of DC cable accessories, the interface between different materials is of vital importance for thier insulating performance. The silicone rubber (SiR)/cross-linking polyethylene (XLPE) interface is considered to be a weak part of the cable systems. The charge is easy to accumulate at interface, leading to the distortion of electric field and degradation of the interfacial insulating performance. The accumulation of charges at the interface is affected by the polarization of the interface and the injection of charges. Therefore, in this paper, the conduction and space charge characteristics of SiR/XLPE bi-layer dielectric specimens are investigated. Firstly, high field conduction and space charge experiments were conducted on SiR/XLPE bi-layer specimens. The transition field of SiR/XLPE bi-layer dielectric specimens was obtained. In addition, the charge injection characteristics of SiR and XLPE specimens under the transition field were also studied. Finally, the interfacial charge polarity was verified using the Maxwell-Wagner interface polarization model. The results provide references for improving the service life of DC cable accessories.