Observations on Structural Changes under Thermal Ageing of Cross-linked Polyethylene Used As Power Cables Insulation
Observations on Structural Changes under Thermal Ageing of Cross-linked Polyethylene Used As Power Cables Insulation
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2008
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通讯作者：
L. Boukezzi;A. Boubakeur;C. Laurent;M. Lallouani
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作者：
L. Boukezzi;A. Boubakeur;C. Laurent;M. Lallouani
关键词：电力电缆绝缘用交联聚乙烯热老化过程中结构变化的观察Larbi Boukezzi 1，Ahmed Boubakeur 2，Christian Laurent 3和Mouhamed Lallouani 4（1）Djelfa大学电气工程系，17000，阿尔及利亚（2）L.R.E./国家理工学院高压实验室，B. P182 EL-Harrach，阿尔及尔，Algeria（3）电气工程实验室，Paul Sabatier大学，31062 ToulouseCedex 4，France（4）ENICA B，Industrial Zone，比斯克拉，Algeria接收日期：2008年4月2日;接受2008年8月9日T广泛使用交联聚乙烯（XLPE）作为绝缘材料，中压和高压电缆的制造可归因于其优异的物理、化学、机械和电气性能。然而，众所周知的是，在使用条件下的退化是在使用ofXLPE电缆绝缘的主要问题。特别是，热氧化降解产生低分子量和含氧产物。本研究采用了几种诊断性测量方法来表征热老化条件下XLPE的行为：首先，对新鲜样品和老化样品进行了FTIR，以揭示热老化对XLPE结构中发生的化学变化的影响。主要的变化是羰基（醛、酮等）的形成。使用DSC分析显示了老化对熔融峰温度T的影响
ABSTRACT Key Words: Observations on Structural Changes under ThermalAgeing of Cross-linked Polyethylene Used AsPower Cables Insulation Larbi Boukezzi 1 , Ahmed Boubakeur 2 , Christian Laurent 3 and Mouhamed Lallouani 4 (1) Department of Electrical Engineering, University of Djelfa,17000, Algeria(2) L.R.E./High Voltage Laboratory, Polytechnic National School, B.P182EL-Harrach, Algiers, Algeria(3) Electrical Engineering Laboratory, Paul Sabatier University, 31062 ToulouseCedex 4, France(4) ENICAB, Industrial Zone, Biskra, AlgeriaReceived 2 April 2008; accepted 9 August 2008 T he widespread use of cross-linked polyethylene (XLPE) as insulation in the man-ufacturing of medium and high voltage cables may be attributed to its outstand-ing physical, chemical, mechanical, and electrical properties. However, it is wellknown that degradation under service conditions is the major problem in the use ofXLPE as cables insulation. Especially, thermal oxidative degradation produces lowmolecular weight and oxygenated products. Several diagnostic measurements havebeen used in this study in order to characterize XLPE behaviour under thermal ageing.Firstly FTIR has been conducted on fresh and aged samples in order to reveal theeffect of thermal ageing on the chemical changes which take place in the XLPE struc-ture. The main changes are the formation of carbonyl groups (aldehyde, ketone, etc.).Use of DSC analysis shows the effect of ageing on the melting peak temperature T