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High voltage direct current (HVDC) cable accessories represent critical points of vulnerability within cable systems, frequently constituting the primary locus of operational failures. Mismatched insulation parameters in cable accessories lead to uneven internal electric field distributions, which deteriorate electrical performance. To solve this problem, a silicone rubber (SiR) matrix material with excellent physical properties is used. Zinc oxide nanorods (ZnOk) are doped into the SiR, and an inorganic filler/SiR composite dielectric is prepared. This study characterized the microstructures of ZnOk composites and systematically evaluated the effects of ZnOk doping on key electrical properties, including nonlinear conductance and breakdown strength. The electric field distributions in enhanced insulation of 200 kV cable intermediate joints were simulated using COMSOL Multiphysics. Results reveal that the ZnOk/SiR composites exhibit pronounced nonlinear conductivity and reliable breakdown strength. The threshold field strength decreases with increasing temperature or doping content, which mitigates local field distortions. These properties validate the applicability of ZnOk/SiR composites as enhanced insulation for cable intermediate joints.

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Enhancing Nonlinear Conductivity and Electric Field Homogeneity in ZnOk/SiR Composites: Experimental Design and Simulation Analysis

  • 会议论文

  • 发表日期：

    2026年

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  • Ziyang Liu,
  • Zhaotong Meng,
  • Zhiqiang Wang

摘要

High voltage direct current (HVDC) cable accessories represent critical points of vulnerability within cable systems, frequently constituting the primary locus of operational failures. Mismatched insulation parameters in cable accessories lead to uneven internal electric field distributions, which deteriorate electrical performance. To solve this problem, a silicone rubber (SiR) matrix material with excellent physical properties is used. Zinc oxide nanorods (ZnOk) are doped into the SiR, and an inorganic filler/SiR composite dielectric is prepared. This study characterized the microstructures of ZnOk composites and systematically evaluated the effects of ZnOk doping on key electrical properties, including nonlinear conductance and breakdown strength. The electric field distributions in enhanced insulation of 200 kV cable intermediate joints were simulated using COMSOL Multiphysics. Results reveal that the ZnOk/SiR composites exhibit pronounced nonlinear conductivity and reliable breakdown strength. The threshold field strength decreases with increasing temperature or doping content, which mitigates local field distortions. These properties validate the applicability of ZnOk/SiR composites as enhanced insulation for cable intermediate joints.