Thermal Analysis of Power Cable in Tunnel Considering Different Laying Conditions

2022 6th International Conference on Power and Energy Engineering (ICPEE) Pub Date : 2022-11-25 DOI:10.1109/ICPEE56418.2022.10050315

H Zhao, Zhanlong Zhang, Yongye Wu, Yu Yang, Zijian Dong

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Abstract

The thermal analysis of the power cable in the tunnel is important to evaluate ampacity, improve service life and ensure operation safety. However, the existing research mainly focuses on the influence of installation mode and installation position on the hottest cable and is less concerned about other cables. This paper establishes the temperature calculation model based on Ohm's law and thermal-flow coupling field, considering power cables laid in free air and closed space. The variation rules and influence factors of cable temperature under rated load conditions and different laying conditions are analyzed. The results show that the operation temperature is related to the proximity effect, heat radiation effect, and heat convection effect between cables and other facilities. When the cable is close to other facilities, the maximum temperature deviation is more than 7.0 K. With the increase in distance, the interaction between cables and other facilities gradually attenuates, and the temperature tends to be the condition of the single cable laid in free air. The research results provide suggestions for the modeling method selection of numerical analysis of cable temperature.

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考虑不同敷设条件的隧道电力电缆热分析

隧道内电力电缆的热分析对评估电缆容量、提高电缆使用寿命和保证电缆运行安全具有重要意义。然而，现有的研究主要集中在安装方式和安装位置对最高温电缆的影响上，对其他电缆的研究较少。考虑电缆敷设在自由空气和封闭空间，建立了基于欧姆定律和热流耦合场的电缆温度计算模型。分析了额定负载条件和不同敷设条件下电缆温度的变化规律及影响因素。结果表明，运行温度与电缆与其他设施之间的接近效应、热辐射效应和热对流效应有关。当电缆靠近其他设施时，最大温度偏差不大于7.0 K。随着距离的增加，电缆与其他设施之间的相互作用逐渐衰减，温度趋向于单根电缆敷设在自由空气中的状态。研究结果为电缆温度数值分析的建模方法选择提供了建议。

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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2022 6th International Conference on Power and Energy Engineering (ICPEE)

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