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Heat blockage of air gap for inner overheating of high-voltage power cable and delay of early detection
Journal of Fire Sciences ( IF 1.9 ) Pub Date : 2020-06-07 , DOI: 10.1177/0734904120920818
Qiyuan Xie 1 , Hong Chen 1 , Yanhua Yuan 1, 2
Affiliation  

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.

中文翻译:

高压电力电缆内部过热气隙热堵塞及早期检测延迟

高压电缆内部过热的早期检测对于安全供电具有重要意义。为具有气隙层的典型 110 kV 电缆开发了一种新的径向传热模型。对不同厚度气隙热铜芯引起的电缆动态温度场进行了数值分析。结果表明,气隙对电缆向外传热具有重要的热阻隔作用。气隙使过热电缆内部的温度上升得更快,而外部的温度上升得更慢。气隙不仅降低了表面温度对内部过热的响应敏感性,而且还会导致内层升温甚至分解。最后,
更新日期:2020-06-07
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