Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (8): 53-59.doi: 10.3969/j.issn.1000-565X.2016.08.009

• Power & Electrical Engineering • Previous Articles     Next Articles

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)

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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