2025年4月8日 周二
首页 > 过刊浏览>2024年第卷第3期 >125-133. DOI:10.19781/j.issn.1673-9140.2024.03.014
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基于宽频阻抗谱的电缆绝缘水树定位机理及算法研究
CSTR:
[cstr]
作者:
作者单位:

(1.国网河北省电力有限公司电力科学研究院，河北 石家庄 050021;2.天津大学电气自动化与信息工程学院，天津 300072)

通讯作者:

韩 涛（1987—），男，博士，副教授，主要从事电力设备状态监测与评估技术等方面的研究；E?mail:hant@tju.edu.cn

中图分类号:

TM855

基金项目:

河北省自然科学基金（E2021521003）；国家电网公司科技项目（kj2021?049）


Mechanism and location algorithm of water tree in cable insulation based on broadband impedance spectrum
Author:
Affiliation:

(1.State Grid Hebei Electric Power Co., Ltd.，Electric Power Research Institute, Shijiazhuang 050021, China;2.School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China)

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    摘要:

    XLPE配网电缆水树故障频发，对电网的安全运行造成威胁。为研究基于宽频阻抗谱的配网电缆水树定位机理，开展加速水树老化实验并测量水树生长不同阶段的电缆微元参数变化，建立电缆水树截面的有限元模型，仿真验证实验测量结果；确定定位算法中的最佳窗函数及入射波形，优化定位算法并依据实验结果验证算法的有效性。结果表明，水树的生长将造成该区域电导和电容的增加，基于宽频阻抗谱的定位方法对于水树引发的局部电容微小变化较敏感，对电导变化不敏感，电容变化定位图谱为典型的双峰特征，且反射峰值大小与局部电容变化量成正比。

    Abstract:

    The water tree in XLPE distribution network cables is a threat to the power grid. In order to study the location mechanism of water tree based on broadband impedance spectrum, an experiment is carried out to accelerate the water tree, and the changes of cable micro-element parameters in different stages of water tree are measured. Then a finite element model of cable water tree section is established and the experimental measurement results are verified. The optimal window function and incident waveform in the location algorithm are determined to get an optimized location algorithm. After that, the effectiveness of algorithm is verified according to the experimental results. The results show that the growth of water tree will cause the increase of conductance and capacitance. The location method based on broadband impedance spectroscopy is more sensitive to small changes in local capacitance caused by water trees, but not sensitive to changes in conductance. The localization map of capacitance changes is a in typical double peak structure, and the reflection amplitude is proportional to the local capacitance change.

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魏力强,苏金刚,韩 涛,等.基于宽频阻抗谱的电缆绝缘水树定位机理及算法研究[J].电力科学与技术学报,2024,(3):125-133.
WEI Liqiang, SU Jingang, HAN Tao, et al. Mechanism and location algorithm of water tree in cable insulation based on broadband impedance spectrum[J]. Journal of Electric Power Science and Technology,2024,(3):125-133.

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