Analysis of Influencing Factors on Temperature Rise of Single-circuit Cable Trench and Empirical Formula Correction

CAO Zhenping; CHEN Xiaofeng; ZHOU Linggang; HAO Jianting; ZHANG Ligang; ZHU Kai; WU Ke

doi:10.13296/j.1001-1609.hva.2026.07.021

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Analysis of Influencing Factors on Temperature Rise of Single-circuit Cable Trench and Empirical Formula Correction

Research & Analysis | 更新时间：2026-07-06

- Analysis of Influencing Factors on Temperature Rise of Single-circuit Cable Trench and Empirical Formula Correction
- High Voltage Apparatus Vol. 62, Issue 7, Pages: 204-212(2026)
- 作者机构：
  
  浙江华云电力工程设计咨询有限公司，杭州 310000
  浙江大学平衡建筑研究中心，杭州 310007
  浙江大学浙江省海洋岩土工程与材料重点实验室，杭州 310058
  浙江大学中原研究院，郑州 450000
  国网浙江省电力有限公司台州供电公司，浙江台州 318000
  中国计量大学能源环境与安全工程学院，杭州 310018
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.07.021
  CLC：
- Received：19 January 2026，
  
  Revised：2026-03-11，
  
  Published：16 July 2026
- 稿件说明：
移动端阅览
CAO Zhenping, CHEN Xiaofeng, ZHOU Linggang, et al. Analysis of Influencing Factors on Temperature Rise of Single-circuit Cable Trench and Empirical Formula Correction[J]. High Voltage Apparatus, 2026, 62(7): 204-212.
DOI：

CAO Zhenping, CHEN Xiaofeng, ZHOU Linggang, et al. Analysis of Influencing Factors on Temperature Rise of Single-circuit Cable Trench and Empirical Formula Correction[J]. High Voltage Apparatus, 2026, 62(7): 204-212. DOI： 10.13296/j.1001-1609.hva.2026.07.021.

摘要

IEC标准的载流量计算方法适用于大多数敷设情况，但在电缆沟敷设环境中，该标准的沟内温升经验公式无法充分考虑中国多样的地质和气候情况，导致计算存在误差。文中基于传热学理论和流体力学理论，并构建全尺寸单回电缆沟数值模型，研究各个因素对电缆沟温升的影响。研究结果表明，IEC经验公式可用于土壤导热良好（如砂土和粉土等）且环境温度较高时的估算，而土壤导热较差条件下（如壤土、淤泥质黏土等）误差较大；电缆沟温升与土壤导热系数、环境温度和地表对流呈负相关关系，其中影响程度最大的是土壤导热系数，其次是环境温度，而地表对流的影响最小；研究构建的考虑土壤导热系数、环境温度修正的单回电缆沟温升预测公式可符合工程计算精度要求。

Abstract

The ampacity calculation method in IEC standard is applicable to most laying situations.However

in the cable trench environment

the empirical formula for temperature rise inside the trench in this standard cannot fully consider the diverse geological and climatic conditions in China

leanding to calculation errors. In this paper， based on the theory of heat transfer and fluid theories

a full-scale numerical model of a single-circuit cable trench is constructed to study the influence of various factors on the temperature rise of the cable trench. The study results show that the IEC empirical formula can be used for estimation under conditions of good thermal conductivity（such as sandy soil and silt

etc）and high ambient temperature

whereas the error is significant under conditions of poor soil thermal conductivity（such as loam

muddy clay

etc）.The temperature rise of cable trench is negatively correlated with soil thermal conductivity

ambient temperature and ground surface convection. Among these factors

soil thermal conductivity has the greatest influence

followed by ambient temperature

while ground surface convection has the smallest impact. The temperature rise prediction formula of a single-circuit cable trench considering soil thermal conductivity and ambient temperature correction can meet the requirements of engineering calculation accuracy.

关键词

Keywords

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