Simulation and Analysis of Impedance Characteristics of MV Cable Joint with Different Moisture Degree

2020 IEEE Electrical Insulation Conference (EIC) Pub Date : 2020-06-01 DOI:10.1109/EIC47619.2020.9158717

Penglei Xu, Y. Di, Xiaokai Guo, Saike Yang, Tian Li, Haochen Wang

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引用次数: 1

Abstract

The cable joint is one of the most vulnerable areas in cable. Based on the theoretical knowledge of time domain reflectometry, this paper establishes a three-dimensional simplified single-core model of the 10kV cold-shrinkable intermediate joint in the CST (Computer Simulation Technology) Studio Suite, and carries out a detailed analysis on joint intruded by water. This paper briefly describes the reflection principle of traveling waves propagating on transmission lines, analyzes changes of reflection waveform and impedance characteristics under different moisture degree at composite interface of joint, and studies the corresponding relationship between moisture degree and impedance characteristics. The results show that the impedance of moisture part will decrease with increase of moisture degree, and amplitude of reflected waveform decreases, and in the severe case, pulses in the opposite direction will appear. At last, two types of basis, vertical comparison and horizontal comparison, are put forward to judge water inflow and moisture degree in cable joint.

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不同含水率中压电缆接头阻抗特性的仿真分析

电缆接头是电缆中最脆弱的部位之一。本文基于时域反射法的理论知识，在CST (Computer Simulation Technology) Studio Suite中建立了10kV冷缩中间节理的三维简化单芯模型，并对节理的水侵进行了详细分析。本文简要介绍了行波在传输线上传播的反射原理，分析了不同含水率下节理复合界面反射波形和阻抗特性的变化，研究了含水率与阻抗特性的对应关系。结果表明:随着含水率的增加，含水率部分的阻抗减小，反射波形幅度减小，严重时出现反方向脉冲;最后，提出了两种判断电缆接头进水和含水率的依据:竖向对比和水平对比。

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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2020 IEEE Electrical Insulation Conference (EIC)

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