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Heat blockage of air gap for inner overheating of high-voltage power cable and delay of early detection

机译：高压电力电缆内部过热的气隙堵塞和早期检测延迟

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摘要

Early detection for inner overheating of high-voltage cable is important for safe power supply. A new radial heat transfer model is developed for a typical 110 kV cable with an air gap layer. Numerical analyses are conducted for dynamic temperature field in cable induced by hot copper core with different thicknesses of air gap. The results show that the air gap has an important heat blockage for the outward heat transfer in cable. The air gap causes the temperature inside the overheated cable to rise faster and the temperature outside slower. The air gap not only reduces the response sensitivity of the surface temperature on inner overheating but also induces the inner layers to heat up and even break down. Finally, the non-dimensional temperatures on cable surface indicate that the detection of inner overheating cable would be delayed if the air gap is not considered in calculation models.
机译：高压电缆内部过热的早期检测对于安全电源很重要。开发了一种新的径向传热模型，用于具有气隙层的典型110kV电缆。具有不同厚度的气隙的热铜芯引起的电缆动态分析对数值分析。结果表明，气隙具有电缆中的向外传热的重要散热。气隙导致过热的电缆内的温度更快，温度较慢。气隙不仅降低了表面温度对内部过热的响应灵敏度，而且还诱导内层加热甚至分解。最后，电缆表面上的非尺寸温度表示如果在计算模型中不考虑气隙，则会延迟内部过热电缆的检测。

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  • 来源
    《Journal of Fire Sciences》 |2020年第4期|363-376|共14页
  • 作者

    Xie Qiyuan; Chen Hong; Yuan Yanhua;

  • 作者单位

    Univ Sci & Technol China State Key Lab Fire Sci Huangshan Rd 443 Hefei 230027 Peoples R China;

    Univ Sci & Technol China State Key Lab Fire Sci Huangshan Rd 443 Hefei 230027 Peoples R China;

    Univ Sci & Technol China State Key Lab Fire Sci Huangshan Rd 443 Hefei 230027 Peoples R China|Shanghai Fire Res Inst MEM Shanghai Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    High-voltage cable; heat blockage; air gap; inner overheating; early detection;

    机译：高压电缆;隔热;气隙;内部过热;早期检测;

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