华南理工大学学报(自然科学版) ›› 2016, Vol. 44 ›› Issue (8): 53-59.doi: 10.3969/j.issn.1000-565X.2016.08.009

• 动力与电气工程 • 上一篇    下一篇

XLPE 电缆老化状况对绝缘层微观结构的影响

刘刚1 吴亮1 金尚儿1 黄嘉盛2   

  1. 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
  • 收稿日期:2015-11-12 修回日期:2016-04-13 出版日期:2016-08-25 发布日期:2016-07-04
  • 通信作者: 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. E-mail:liugang@scut.edu.cn
  • 作者简介: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.
  • 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)

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

LIU Gang1 WU Liang1 JIN Shang-er1 HUANG Jia-sheng2   

  1. 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
  • Received:2015-11-12 Revised:2016-04-13 Online:2016-08-25 Published:2016-07-04
  • Contact: 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. E-mail:liugang@scut.edu.cn
  • About author: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.
  • 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)

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

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