热处理前后非脱气交联聚乙烯的介电性能和机械性能分析（英文）
Investigation of Dielectric and Mechanical Properties of Undegassed XLPE Cable with Thermal Treatment作者机构：State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Electric Power Research Institute of Shanghai Electric Power Corporation Maintenance Subsidiary of Shanghai Electric Power Corporation
出 版 物：《高电压技术》 (High Voltage Engineering)
年 卷 期：2015年第41卷第4期
页 面：1237-1242页
核心收录：
学科分类：0808[工学-电气工程] 080803[工学-高电压与绝缘技术] 08[工学]
主 题：XLPE电缆 热处理 交联聚乙烯绝缘电缆 力学性能 质量损失率 甲基苯乙烯 电击穿强度 介质
摘 要：In order to investigate the influence of cross-linking byproducts on dielectric and mechanical properties of 110k V cross-linked polyethylene(XLPE)cable insulation,we selected the undegassed XLPE cable insulation which is heated at 70℃in laboratory for different duration in terms of heating time,to prepare XLPE samples with different mass loss *** carried out Fourier transform infrared spectroscopy(FTIR)test,electric breakdown test at 50 Hz,pulsed electro-acoustic(PEA)measurement and tensile test for XLPE *** FTIR spectrogram,the characteristic absorption peaks were observed to appear at 1 680 cm-1 and 1 600 cm-1,which can be related to two kinds of cross-linking byproducts includingα-methylstyrene and *** intensity of these absorption peaks decreases with the increase of mass loss *** can be proposed that the mass loss of XLPE samples in the process of thermal treatment is caused by volatiliztion ofα-methylstyrene and ***,the change of mass loss ratio can reflect the change of content ofα-methylstyrene and acetophenone in the process of thermal *** results of electric breakdown test showed that the reduction ofα-methylstyrene and acetophenone leads to the enhancement of electric breakdown strength at 50 *** measurement results showed that heterocharge is produced and accumulated when cross-linking byproducts are present,whereas no heterocharge is found whenα-methylstyrene and acetophenone are *** formation of heterocharge is attributed to ionization of cross-linking byproducts under electric *** on these results,it can be suggested that when AC electric field is applied on XLPE samples,the occurrence of ionization of cross-linking byproducts results in the increase of free carriers in XLPE insulation,leading to a lower electric breakdown *** results of tensile test showed that tensile strength is proportional to the mass loss ratio of XLPE samples,which suggests that cross-linkin
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