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<p>Dynamic line rating (DLR) technology is an effective solution to address the transmission capacity limitations of overhead lines. To overcome the shortcomings of traditional DLR schemes that consider only thermal stability constraints, this paper introduces a finite element-based multiphysics coupling method into a DLR scheme that simultaneously considers both conductor temperature and sag limits. A refined conductor temperature rise model under the influence of multiple parameters is developed, along with a three-dimensional transmission tower-line sag calculation model based on the iterative correction method. The coupling relationship among current-carrying capacity, conductor temperature, and sag is simulated, significantly improving the accuracy and field applicability of the model. In addition, an integrated DLR monitoring device comprising conductor status terminals, micro-meteorological sensors, and a main controller is designed to achieve real-time monitoring of conductor and environmental parameters, as well as dynamic adjustment of ampacity. Case studies demonstrate that the proposed scheme can achieve a 37% to 139% increase in transmission capacity while satisfying the dual safety criteria of conductor temperature and ground clearance. This study realizes a closed-loop integration from finite element calculation models to practical engineering application and shows promising engineering applicability.</p>

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Research on the calculation model of conductor current-carrying capacity-temperature rise-sag for dynamic line rating technology

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Jiaxuan Zheng,
  • Zhiye Du,
  • Jingwen Huang,
  • Hao Wang,
  • Yuexin Wang,
  • Yan Gan,
  • Jia Chen

摘要

Dynamic line rating (DLR) technology is an effective solution to address the transmission capacity limitations of overhead lines. To overcome the shortcomings of traditional DLR schemes that consider only thermal stability constraints, this paper introduces a finite element-based multiphysics coupling method into a DLR scheme that simultaneously considers both conductor temperature and sag limits. A refined conductor temperature rise model under the influence of multiple parameters is developed, along with a three-dimensional transmission tower-line sag calculation model based on the iterative correction method. The coupling relationship among current-carrying capacity, conductor temperature, and sag is simulated, significantly improving the accuracy and field applicability of the model. In addition, an integrated DLR monitoring device comprising conductor status terminals, micro-meteorological sensors, and a main controller is designed to achieve real-time monitoring of conductor and environmental parameters, as well as dynamic adjustment of ampacity. Case studies demonstrate that the proposed scheme can achieve a 37% to 139% increase in transmission capacity while satisfying the dual safety criteria of conductor temperature and ground clearance. This study realizes a closed-loop integration from finite element calculation models to practical engineering application and shows promising engineering applicability.