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<p>As urban power grid loads keep rising, clustered multi-circuit laying of 110&#xa0;kV XLPE cables has become prevalent. Thermal interaction between adjacent cable circuits substantially degrades cable ampacity. Conventional engineering calculation approaches fail to fully account for diverse operating scenarios, leading to notable errors in ampacity correction factors. Taking 110&#xa0;kV single-core XLPE cables as the research object, this paper addresses the problems of large deviation in the value of correction factors for cluster cable current-carrying capacity and insufficient consideration of influencing factors in engineering through a combination of finite element simulation and thermal circuit model. Firstly, the adaptability of the finite element model and conventional thermal circuit model is verified, and the calculation method for the cluster cable ampacity correction factor is derived and validated. With the factor introduced, the calculation error under double-circuit conditions is controlled within ± 6%, meeting engineering accuracy requirements. Secondly, four key influencing factors were investigated: the correction factor is positively correlated with relative spacing and negatively correlated with circuit number, higher in air than in soil, and higher in horizontal arrangement than in triangular arrangement, while cable cross-section has a negligible effect. Finally, a practical correction method is proposed to improve the cable thermal circuit model and support the design, operation and maintenance of high-voltage cable projects, with future work suggested for parameters under extreme environments.</p>

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Sensitivity analysis of cluster cable current-carrying capacity correction factor

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月28日

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  • Kun Li,
  • Jiang Chang,
  • Kai Xia,
  • Can Wang

摘要

As urban power grid loads keep rising, clustered multi-circuit laying of 110 kV XLPE cables has become prevalent. Thermal interaction between adjacent cable circuits substantially degrades cable ampacity. Conventional engineering calculation approaches fail to fully account for diverse operating scenarios, leading to notable errors in ampacity correction factors. Taking 110 kV single-core XLPE cables as the research object, this paper addresses the problems of large deviation in the value of correction factors for cluster cable current-carrying capacity and insufficient consideration of influencing factors in engineering through a combination of finite element simulation and thermal circuit model. Firstly, the adaptability of the finite element model and conventional thermal circuit model is verified, and the calculation method for the cluster cable ampacity correction factor is derived and validated. With the factor introduced, the calculation error under double-circuit conditions is controlled within ± 6%, meeting engineering accuracy requirements. Secondly, four key influencing factors were investigated: the correction factor is positively correlated with relative spacing and negatively correlated with circuit number, higher in air than in soil, and higher in horizontal arrangement than in triangular arrangement, while cable cross-section has a negligible effect. Finally, a practical correction method is proposed to improve the cable thermal circuit model and support the design, operation and maintenance of high-voltage cable projects, with future work suggested for parameters under extreme environments.