Diagnosis Method for Thermal Aging and Water Tree Aging of Insulation Based on Lissajous Figure and Current Harmonic Characteristic Quantity

2023 IEEE 6th International Electrical and Energy Conference (CIEEC) Pub Date : 2023-05-12 DOI:10.1109/CIEEC58067.2023.10167312

G. Lv, Wei Wang, Zongyuan Luo, Ke Li, Yujin Li, Yuan Xia, Jiajun Li, Hao Yang

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Abstract

Power cables are one of the most important devices in the power system. In order to diagnose the aging state of XLPE cable insulation, this paper carried out 90°C, 120°C, 150°C accelerated thermal aging experiments and accelerated water tree aging experiments on the cable section samples in the laboratory, tested and analyzed the changing laws of $\tan\delta-f$ curves, Lissajous figures and current harmonic content of different samples. The experimental results show that for the cable section samples with internal water tree aging, the Lissajous figure inclination angle is significantly larger than that of the thermal aging samples, and the harmonic component of the current is mainly within tenth order. With the increase of aging time, the characteristics will be more obvious, so the ageing type of the cable can be distinguished. At the same time, the minor axis length of the Lissajous figure and the harmonic distortion within the tenth order THD10 have a good correlation with the $\tan\delta$ of the cable, which can be used to judge the aging degree of the cable.

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基于Lissajous图和电流谐波特征量的绝缘热老化和水树老化诊断方法

电力电缆是电力系统中最重要的设备之一。为了诊断XLPE电缆绝缘的老化状态，本文在实验室对电缆截面试样进行了90℃、120℃、150℃加速热老化实验和加速水树老化实验，测试并分析了不同试样$\tan\delta-f$曲线、利萨若曲线和电流谐波含量的变化规律。实验结果表明，对于内部水树老化的电缆截面样品，利萨图倾角明显大于热老化样品，且电流的谐波分量主要在10阶以内。随着老化时间的增加，其特征会更加明显，因此可以区分电缆的老化类型。同时，Lissajous图的小轴长度和THD10十阶以内的谐波畸变与电缆的$\tan\delta$有很好的相关性，可以用来判断电缆的老化程度。

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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2023 IEEE 6th International Electrical and Energy Conference (CIEEC)

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