Inhibition Effect of Prior Rejuvenation on Water Tree Propagation in XLPE Cables

YANG Di; ZHOU Kai; TAO Wenbiao; HUANG Ming; YANG Mingliang

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Inhibition Effect of Prior Rejuvenation on Water Tree Propagation in XLPE Cables

更新时间：2025-12-08

- Inhibition Effect of Prior Rejuvenation on Water Tree Propagation in XLPE Cables
- Vol. 41, Issue 8, Pages: 2732-2740(2015)
- 作者机构：
  
  四川大学电气信息学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 August 2015，
  
  Published：2015
- 稿件说明：
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YANG Di, ZHOU Kai, TAO Wenbiao, et al. Inhibition Effect of Prior Rejuvenation on Water Tree Propagation in XLPE Cables[J]. 2015, 41(8): 2732-2740.
DOI：

YANG Di, ZHOU Kai, TAO Wenbiao, et al. Inhibition Effect of Prior Rejuvenation on Water Tree Propagation in XLPE Cables[J]. 2015, 41(8): 2732-2740. DOI：

摘要

为了研究在交联聚乙烯（XLPE）运行电缆的缆芯提前注入修复液（即预修复）后对水树生长的抑制效果和作用机理

首先利用修复液注入装置向新电缆样本的缆芯中注入了有机硅修复液

形成了预修复电缆样本。然后使用水针电极法对预修复电缆样本和未预修复电缆样本进行了加速水树老化。通过光学显微镜观察了2种电缆样本中不同时期的水树生长情况

并测量了不同老化时间下的水树长度。同时利用红外光谱（infrared spectrometer

IR）

扫描电镜（scanning electron microscope

SEM）和能谱仪（energy disperse spectroscopy

EDS）分析了2种电缆样本中水树区的化学结构和微观形貌的变化。通过对比不同电缆样本加速老化4周时间后的水树长度

发现未预修复电缆样本中的平均水树长度是预修复电缆样本的1.4倍。通过扫描电镜和能谱仪分析电缆样本中绝缘层的微观形貌和元素构成

发现预修复电缆样本的绝缘层中几乎没有微孔

但可观察到大量含有硅元素的白色颗粒状填充物。该研究证明了预先注入到电缆缆芯的修复液能提前扩散到绝缘层中

与老化过程中浸入绝缘层的水分发生水解-缩合反应并消耗绝缘层中的水分

同时生成有机物来填充水树微孔和通道

从而能有效抑制XLPE电缆中水树的生长。

Abstract

In order to investigate the inhibition effect and its mechanism of prior rejuvenation for water trees in XLPE cables in service

the prior rejuvenation cable samples were prepared by injecting siloxane liquid into the core of new cables with a pressure. New cable samples and the prior rejuvenation cable samples were subjected to accelerated aging experiment using the water-needle electrical method. By optical microscope

the water trees in the cable samples were observed and the lengths of water trees were measured at different aging times. Meanwhile

molecular structures and microstructure of the water tree areas in XLPE cable samples were observed and analyzed by infrared spectrometer（IR）

scanning electron microscope（SEM） and energy disperse spectroscopy（EDS）. The results indicate that the average length of water trees in the untreated cable samples is 0.4 times longer than that in the prior rejuvenating cable samples after aged 4 weeks. By SEM and EDS

few micro pores but a large amount of white particles comprised of silicon were observed in the water tree area of the prior rejuvenation cable samples. It is proposed that the rejuvenation liquid was able to diffuse into the insulation; it reacted with water molecule during the accelerated aging experiment and generated organic particles that filled micro pores in water tree. Therefore

it can inhibit water tree growth in XLPE cables.

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