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The Pre-insertion Resistor (PIR) is a critical component in high-voltage circuit breakers, designed to mitigate closing overvoltage by converting the L-C oscillation generated during line closing into thermal energy, which is then dissipated into the external environment. The PIR is primarily composed of clay, alumina, and toner, with its thermal and electrical properties being pivotal to its performance and application. Therefore, careful selection of raw materials and their optimal proportions is essential to ensure the effectiveness and reliability of the product. In this manuscript, the composition ratio of the raw material consist closing resistor sheet with the ceramic phase and the conductive phase is studied. Firstly, chemically pure conductive carbon materials, alumina aggregates and clay raw materials were selected, and the conductive carbon materials were determined to be graphite, alumina aggregates to α-Al2O3, and clay materials to kaolin through composition optimization. As a result, the material with 20% graphite has the best overall performance.

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Advanced Materials for Pre-insertion Resistors in High-Voltage Circuit Breakers

  • 会议论文

  • 发表日期：

    2026年

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  • Jiexin Zhang,
  • Wenjie Liu,
  • Dingjun Wen,
  • Xingyu Zhao,
  • Kang Liu,
  • Congrui Zhang,
  • Yi Ding

摘要

The Pre-insertion Resistor (PIR) is a critical component in high-voltage circuit breakers, designed to mitigate closing overvoltage by converting the L-C oscillation generated during line closing into thermal energy, which is then dissipated into the external environment. The PIR is primarily composed of clay, alumina, and toner, with its thermal and electrical properties being pivotal to its performance and application. Therefore, careful selection of raw materials and their optimal proportions is essential to ensure the effectiveness and reliability of the product. In this manuscript, the composition ratio of the raw material consist closing resistor sheet with the ceramic phase and the conductive phase is studied. Firstly, chemically pure conductive carbon materials, alumina aggregates and clay raw materials were selected, and the conductive carbon materials were determined to be graphite, alumina aggregates to α-Al2O3, and clay materials to kaolin through composition optimization. As a result, the material with 20% graphite has the best overall performance.