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

IF 1.9 4区 工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY
Q. Xie, Hong Chen, Yanhua Yuan
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引用次数: 1

Abstract

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.
高压电力电缆内部过热气隙热堵塞,延迟早期发现
高压电缆内部过热的早期检测对安全供电具有重要意义。针对典型的带有气隙层的110kV电缆,建立了一种新的径向传热模型。对不同气隙厚度的热铜芯引起的电缆动态温度场进行了数值分析。结果表明,气隙对电缆的向外传热具有重要的热阻塞作用。气隙导致过热电缆内部的温度上升得更快,而外部的温度则上升得更慢。气隙不仅降低了表面温度对内部过热的响应灵敏度,而且会导致内层发热甚至破裂。最后,电缆表面的无量纲温度表明,如果在计算模型中不考虑气隙,电缆内部过热的检测将延迟。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Fire Sciences
Journal of Fire Sciences 工程技术-材料科学:综合
CiteScore
4.00
自引率
0.00%
发文量
14
审稿时长
2.5 months
期刊介绍: The Journal of Fire Sciences is a leading journal for the reporting of significant fundamental and applied research that brings understanding of fire chemistry and fire physics to fire safety. Its content is aimed toward the prevention and mitigation of the adverse effects of fires involving combustible materials, as well as development of new tools to better address fire safety needs. The Journal of Fire Sciences covers experimental or theoretical studies of fire initiation and growth, flame retardant chemistry, fire physics relative to material behavior, fire containment, fire threat to people and the environment and fire safety engineering. This journal is a member of the Committee on Publication Ethics (COPE).
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