Study on High Frequency Transmission Characteristics of Coaxial Power Cable Based on Impedance Spectrum

ZHANG Dandan; ZHENG Jiankang; FENG Nanzhan; LI Li; LIU Xiang; SU Xiaoting; ZHU Ziping; LI Shaobin

doi:10.13296/j.1001-1609.hva.2021.06.003

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Study on High Frequency Transmission Characteristics of Coaxial Power Cable Based on Impedance Spectrum

更新时间：2025-04-26

- Study on High Frequency Transmission Characteristics of Coaxial Power Cable Based on Impedance Spectrum
- High VoltageApparatus Vol. 57, Issue 6, Pages: 18-23(2021)
- 作者机构：
  
  1. 华中科技大学强电磁工程与新技术国家重点实验室
  2. 国家电网公司西安供电公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2021.06.003
  CLC： TM248.3
- Published：2021
- 稿件说明：
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ZHANG Dandan, ZHENG Jiankang, FENG Nanzhan, et al. Study on High Frequency Transmission Characteristics of Coaxial Power Cable Based on Impedance Spectrum[J]. High voltageapparatus, 2021, 57(6): 18-23.
DOI：

ZHANG Dandan, ZHENG Jiankang, FENG Nanzhan, et al. Study on High Frequency Transmission Characteristics of Coaxial Power Cable Based on Impedance Spectrum[J]. High voltageapparatus, 2021, 57(6): 18-23. DOI： 10.13296/j.1001-1609.hva.2021.06.003.

摘要

电缆的传播常数、特征阻抗、相速度的高频特性表征了电缆的高频传输特性

而准确获取电缆的高频传输特性是电缆故障定位的基础。文中针对现有测试技术的不足

提出了基于电缆阻抗谱的同轴电力电缆高频传输特性获取方法

研究结果表明:在300 kHz～100 MHz频率范围

随着频率的增大

衰减常数和相移系数近似线性增大;相速度随频率的增大略有增加

并趋于稳定值;受测量接线处附加电感和附加电容的影响

特征阻抗的高频特性出现较为严重的畸变。

Abstract

The high frequency characteristics of transmission constant

characteristic impedance

wave velocity and distribution parameters of cables characterize the high frequency transmission characteristics of cables. Accurate acquisition of high frequency transmission characteristics of cable is the basis of cable fault location. In view of the shortcomings of the existing testing technology

a method for obtaining high frequency transmission characteristics of coaxial power cable based on cable impedance spectrum is proposed. The results show that in the frequency range of 300 kHz～100 MHz

with the increase of frequency

the attenuation constant and phase shift coefficient increase linearly. The phase velocity increases slightly with the increase of frequency and tends to be stable. Affected by the additional inductance and capacitance of the measured wiring

the high frequency characteristic of the characteristic impedance is seriously distorted.

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