摘要
为了研究不同脱气时间对高压直流电缆绝缘特性的影响,该文采用超纯交联聚乙烯(XLPE)电缆料,利用平板热压法制备试样,通过70℃、常压下脱气处理,得到0h、12h、36h和90h四种不同脱气时间的试样。采用电流密度、空间电荷、直流击穿和X射线衍射(XRD)测试,研究XLPE试样脱气前后绝缘特性的变化规律。研究结果表明,脱气12h后,试样空间电荷分布得到明显改善,电极附近几乎无空间电荷积累;脱气36h后的实验具有最佳的电气性能,其电流密度明显降低,击穿场强提高了约18kV/mm;脱气90h后,试样的结晶度特性变化明显,结晶度下降了约11%,结晶衍射峰强度下降了约62%。上述结果表明,脱气处理有利于XLPE试样中交联副产物的挥发以及其绝缘性能的提高,而且可以通过最优化脱气时间改善材料的绝缘性能,从而降低企业的生产和时间成本。
In order to study the effect of different degassing time on the insulation properties of high-voltage DC cables,in this paper,ultra-pure cross-linked polyethylene(XLPE)cable material is used to prepare samples by flat-plate hot pressing.Four samples with different degassing time of 0 h,12 h,36 h and 90 h were obtained by degassing treatment at 70℃and normal pressure.Through the current density,space charge,DC breakdown,and XRD test,the change rule of the insulation characteristics of the XLPE sample before and after degassing was studied.The results show that the space charge distribution is significantly improved after 12 h of degassing,and there is almost no space charge accumulation near the electrode;The experiment after 36 h of degassing has the best electrical performance,the current density is significantly reduced,and the breakdown field strength is increased by about 18 kV/mm;After degassing for 90 h,the crystallinity characteristic of the sample changed significantly,the crystallinity is decreased by about 11%,and the crystal diffraction peak intensity is decreased by about 62%.The above results indicate that the degassing treatment contributes to the volatilization of cross-linking by-products in the XLPE sample and the improvement of its insulating properties,and the insulation performance of the material can be improved by optimizing the degassing time,thereby reducing the production and time costs of the enterprises.
作者
罗兵
孟繁博
王婷婷
贾磊
陈向荣
Luo Bing;Meng Fanbo;Wang Tingting;Jia Lei;Chen Xiangrong(State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid,Guangzhou 510663 China;Zhejiang Provincial Key Laboratory of Electrical Machine Systems College of Electrical Engineering Zhejiang University,Hangzhou 310027 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2021年第S02期730-735,共6页
Transactions of China Electrotechnical Society
基金
直流输电技术国家重点实验室(南方电网科学研究院有限责任公司)项目(SKLHVDC-2019-KF-18)
宁波市“科技创新2025”重大专项(2018B10019)
浙江大学“百人计划”(自然科学A类)资助。
关键词
脱气处理
高压直流电缆
交联聚乙烯
电流密度
击穿场强
空间电荷
Degassing process
high voltage direct current cable
cross-linked polyethylene
current density
breakdown strength
space charge
作者简介
罗兵,男,1966年生,高级工程师,研究方向为高电压外绝缘技术。E-mail:luobing@csg.cn;通信作者:孟繁博,男,1991年生,博士研究生,研究方向为高压交直流电缆系统绝缘测试和状态监测技术。E-mail:meng_fanbo_zju@163.com。
