XLPE 电缆老化状况对绝缘层微观结构的影响

刘刚 吴亮 金尚儿 黄嘉盛

doi:10.3969/j.issn.1000-565X.2016.08.009

华南理工大学学报(自然科学版) >

2016 , Vol. 44 >Issue 8: 53 - 59

DOI: https://doi.org/10.3969/j.issn.1000-565X.2016.08.009

动力与电气工程

XLPE 电缆老化状况对绝缘层微观结构的影响

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1．华南理工大学电力学院//广东省绿色能源技术重点实验室，广东广州 510640; 2．广州供电局有限公司输电所，广东广州 510310

刘刚( 1969-) ，男，博士，副教授，主要从事智能高压电网、过电压及其防护、电力设备外绝缘研究．

收稿日期: 2015-11-12

修回日期: 2016-04-13

网络出版日期: 2016-07-04

基金资助

国家高技术研究发展计划( 863 计划) 项目( 2015AA050201) ; 国家自然科学基金面上项目( 51477054) ; 广东省科技计划项目( 2013B010405002)

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Influence of Aging Condition of XLPE Cable on Microstructure of Insulating Layer

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1.School of Electric Power//Guangdong Key Laboratory of Clean Energy Technology,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Transmission Department,Guangzhou Power Supply Bureau Co.,Ltd.,Guangzhou 510310,Guangdong,China

刘刚( 1969-) ，男，博士，副教授，主要从事智能高压电网、过电压及其防护、电力设备外绝缘研究．

Received date: 2015-11-12

Revised date: 2016-04-13

Online published: 2016-07-04

Supported by

Supported by the National High-tech R&D Program of China ( 863 program) ( 2015AA050201) ， the National Natural Science Foundation of China ( 51477054 ) and the Science and Technology Planning Project of Guangdong Province ( 2013B010405002)

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摘要

对两条退役110 kV XLPE 电缆和一条备用电缆进行试验，利用电声脉冲法( PEA) 和X 射线衍射技术( XRD) 研究了老化状况对XLPE 电缆绝缘层微观结构的影响．结果表明: 电缆的老化会造成绝缘晶体尺寸减小，结晶度降低，因此其捕获空间电荷的能力增强; 老化过程始于电缆最外层，而长时间的老化作用对绝缘中间层的影响更大，中间
层可能是击穿的薄弱环节; XLPE 电缆绝缘老化使绝缘微观结构从“中间高两端低”转变为“均匀化”

关键词： 110 kV XLPE 电缆; 电声脉冲法; X 射线衍射; 晶体; 空间电荷

本文引用格式

刘刚吴亮金尚儿黄嘉盛 . XLPE 电缆老化状况对绝缘层微观结构的影响[J]. 华南理工大学学报(自然科学版), 2016 , 44(8) : 53 -59 . DOI: 10.3969/j.issn.1000-565X.2016.08.009

Abstract

By testing two retired 110 kV XLPE cables and a spare cable,the influence of the aging condition of XLPE cables on the microstructure of insulating layers is revealed by means of PEA ( Pulsed Electro-Acoustic Method) and XRD.The results show that ( 1) the aging of the cables causes the size and crystallinity of insulation crystal to decrease,thus increasing the ability of the crystal to capture the space charges; ( 2) the aging process begins in the outermost layer of the cables,and a lasting aging has a greater influence on the intermediate insulating layer; ( 3) therefore,the intermediate layer may be the weak link where the breakdown occurs easily; and ( 4) due to the aging of XLPE cables,the microstructure characteristic changes from“high in the middle and low in both ends”to "homogenization”.

Key words： 110 kV XLPE cable; pulsed electro-acoustic method; X-ray diffraction; crystal; space charge

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