电力电缆金属护层的交流电阻计算及测量

韩啸; 刘雄军; 刘英; 张何燕

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电力电缆金属护层的交流电阻计算及测量

更新时间：2025-06-18

- 电力电缆金属护层的交流电阻计算及测量
- Calculation and Measurement of AC Resistance for the Metal Sheath in Power Cables
- 高压电器 2025年页码：1-8
- 作者机构：
  
  1.江苏上上电缆集团科学技术研究院，江苏　溧阳　 213300
  2.西安交通大学电气工程学院，西安　 710049
- 作者简介：
  
  韩啸（1992—），男，硕士，工程师，主要从事超/特高压电缆与电气绝缘方面的研究（E-mail：1062278235@qq.com）。
  刘英（1976—），女，博士，副教授，从事电气绝缘结构设计、电力电缆及绝缘测试技术研究（E-mail：candyly@mail.xjtu.edu.cn）。
- 基金信息：
  
  国家自然科学基金(51777156)
- DOI：
  中图分类号：
- 纸质出版日期：
- 稿件说明：
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韩啸, 刘雄军, 刘英, 等. 电力电缆金属护层的交流电阻计算及测量[J/OL]. 高压电器, 2025,1-8.

HAN Xiao, LIU Xiongjun, LIU Ying, et al. Calculation and Measurement of AC Resistance for the Metal Sheath in Power Cables[J/OL]. High voltage apparatus, 2025, 1-8.
韩啸, 刘雄军, 刘英, 等. 电力电缆金属护层的交流电阻计算及测量[J/OL]. 高压电器, 2025,1-8. DOI：

HAN Xiao, LIU Xiongjun, LIU Ying, et al. Calculation and Measurement of AC Resistance for the Metal Sheath in Power Cables[J/OL]. High voltage apparatus, 2025, 1-8. DOI：

摘要

金属护层是电力电缆的必要组成部分，其交流电阻是电缆设计及性能评估的重要参数，但目前还没有推荐计算公式或算法可参考，也没有专用测量设备可应用。文中针对电力电缆金属护层的电阻计算及测量展开研究，重点关注交流电阻相对于直流电阻增大的程度。首先，对不同结构金属护层的直流电阻解析算法进行讨论，并借鉴中空线芯导体的推荐公式，提出了金属护层交流电阻的计算方法。在此基础上，讨论了材料电导率、护层厚度、电源频率、电缆相间距对金属护层交直流电阻比的影响。之后，建立了金属护层电阻测量方法及测试线路，利用特制夹具及铠装回流等方式减小接触电阻及电磁干扰的影响，对3种不同型号的电缆成品进行了测量，并将测量数据与解析计算结果进行对比，两者具有较好的一致性。研究表明，虽然工频下电缆中常规厚度的金属护层其交流有效电阻比直流电阻增大幅度不超过2%，但随频率增大交直流电阻比将显著增加；文中提出的方法可用于不同材料、结构及尺寸的金属护层直流及交流电阻的工程计算及测量，具有较好的适用性。

Abstract

The metal sheath is an essential part of a power cable

and its AC resistance is an important parameter for cable design and performance evaluation. However

there is neither recommended calculation formula or algorithm

nor special measuring device. This paper aims to study the resistance calculation and measurement of metal sheath in power cables

with a focus on the increase degree of AC resistance compared to DC resistance. Firstly

the analytical algorithm of DC resistance is presented for the metal sheath with different structures

and the calculation method of AC resistance is proposed by referring to the recommended formula of hollow conductor. Based on this

the effects of material conductivity

sheath thickness

power frequency and phase spacing on the AC/DC resistance ratio of metal sheath are discussed. At the same time

the measuring method is established for the resistance of metal sheath

and the corresponding test circuit is set up

where the influence of poor contact and electromagnetic interference can be minimized by the special sample fixture and armor back-flowing method. The case study is performed on the metal sheath of three different cables

and the measured data are compared with the analytically calculated values

where a good consistency is found. The results show that although the AC resistance is no more than 2% higher than the DC one for the metal sheath with a normal thickness

the AC/DC resistance ratio will increase remarkably with the increase of the frequency. The method proposed in this paper can be used for the engineering calculation and measurement of DC and AC resistance of metal sheath with different materials

structures and sizes

which is widely applicable.

关键词

Keywords

references

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