XLPE中压电缆中间接头的界面老化修复研究
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摘要
电缆中间接头是城市电缆系统中最容易出现问题的部位,为了提高老化后电缆中间接头的绝缘性能,本研究尝试通过向中间接头注入修复液的方法进行修复。首先在潮湿环境下对电缆中间接头进行电热加速老化试验,并向老化后的样本注入修复液进行修复,通过工频介质损耗测量、工频击穿试验和能谱分析对修复前后中间接头样本的结构和性能进行对比分析。结果表明:老化后电缆中间接头的绝缘强度明显下降,而通过修复液修复后其绝缘性能有所提升。通过能谱仪检测发现修复后中间接头界面出现了Si和Ti的氧化物,说明修复液可以扩散进入中间接头界面并与侵入的水汽反应生成有机聚合物,填充在界面气隙空腔位置,从而提高了中间接头的界面击穿电压,达到了修复电缆中间接头的目的。
The cable intermediate joint is the part where problems are most likely to occur in urban cable system. In order to improve the insulating properties of the aged cable intermediate joint, a repair fluid was injected into the intermediate joint to repair it. Firstly, the cable intermediate joint was conducted electrothermal accelerate ageing tests in humid environment, and then the aged sample was injected repair fluid. The structure and properties of the intermediate joint samples before and after repairing were compared by power frequency dielectric loss measurement, power frequency breakdown test, and energy spectrum analysis test. The results show that the insulation strength of the cable intermediate joint after ageing decreases significantly, and the insulating properties is improved after repairing by repair fluid. It is found by the energy dispersive spectrometer detection that there are Si and Ti oxides appeared on the interface of intermediate joint, which indicates that the repair fluid can diffuse into the interface of the cable intermediate joint and react with the moisture to form organic polymers filling the air gap cavity of interface, so as to increase the breakdown voltage of intermediate joint and achieve the purpose of repairing cable intermediate joint.
The cable intermediate joint is the part where problems are most likely to occur in urban cable system. In order to improve the insulating properties of the aged cable intermediate joint, a repair fluid was injected into the intermediate joint to repair it. Firstly, the cable intermediate joint was conducted electrothermal accelerate ageing tests in humid environment, and then the aged sample was injected repair fluid. The structure and properties of the intermediate joint samples before and after repairing were compared by power frequency dielectric loss measurement, power frequency breakdown test, and energy spectrum analysis test. The results show that the insulation strength of the cable intermediate joint after ageing decreases significantly, and the insulating properties is improved after repairing by repair fluid. It is found by the energy dispersive spectrometer detection that there are Si and Ti oxides appeared on the interface of intermediate joint, which indicates that the repair fluid can diffuse into the interface of the cable intermediate joint and react with the moisture to form organic polymers filling the air gap cavity of interface, so as to increase the breakdown voltage of intermediate joint and achieve the purpose of repairing cable intermediate joint.
引文
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[16]黄明,周凯,杨滴,等.在线注入有机硅修复液对交联聚乙烯电缆中水树生长的影响[J].电工技术学报,2016,31(21):176-182.
[17]周凯,陶霰韬,赵威,等.在水树通道内生成纳米TiO2的电缆修复方法及其绝缘增强机制研究[J].中国电机工程学报,2013,33(7):202-210.
[2]李华春,周作春,陈平.110kV及以上高压交联电缆系统故障分析[J].电力设备,2004,25(8):9-13.
[3]郭灿新,张丽,钱勇,等.XLPE电力电缆中局部放电检测及定位技术的研究现状[J].高压电器,2009,45(3):56-60.
[4]IEEE Power and Energy Society.IEEE Std 400.3TM-2006.IEEE guide for partial discharge testing of shielded power cable systems in a field environment[S].New York,US:IEEE,2006.
[5]夏岩松,骆立实,李永东,等.划痕类微孔对交联聚乙烯-硅橡胶界面电痕破坏的影响[J].高压电器,2011,47(12):109-114.
[6]邹林,涂扬,孟永鹏,等.界面压强和表面粗糙度对聚乙烯与硅橡胶界面的局部放电的影响[J].绝缘材料,2014,47(3):94-98.
[7]柳松,彭嘉康,王霞,等.高压电缆附件界面压力的影响因素分析[J].绝缘材料,2013,46(6):86-89.
[8]周凯,赵威,陶文彪,等.XLPE电缆绝缘水树老化的无机修复机理及试验分析[J].高电压技术,2014,40(1):67-73.
[9]何恩广,刘学忠.纳米TiO2填料对变频电机耐电晕电磁线绝缘性能的影响[J].电工技术学报,2003,18(1):72-76.
[10]宫斌,张冶文,郑飞虎,等.纳米TiO2掺杂对低密度聚乙烯空间电荷行为的影响[J].材料研究学报,2005,19(5):519-524.
[11]周凯,赵威,陶文彪,等.XLPE电缆绝缘水树老化的无机修复机理及试验分析[J].高电压技术,2014,40(1):67-73.
[12]STAGI W R.Cable injection technology[C]//2006 IEEE/PES Transmission&Distribution Conference and Exposition:Latin America.Caracas,Venezuela:IEEE,2006:1-4.
[13]蒋仁言.威布尔模型族[M].北京:科学出版社,1998.
[14]HASHEMINEZHAD S M.Breakdown strength of solid∣solid interfaces[C]//2011 IEEE Trondheim PowerTech Trondheim.Trondheim,Norway:IEEE,2010:1-4.
[15]杨明亮,周凯,吴科,等.基于纳米SiO2复合填充的交联聚乙烯电缆水树修复新技术[J].电工技术学报,2015,30(14):481-487.
[16]黄明,周凯,杨滴,等.在线注入有机硅修复液对交联聚乙烯电缆中水树生长的影响[J].电工技术学报,2016,31(21):176-182.
[17]周凯,陶霰韬,赵威,等.在水树通道内生成纳米TiO2的电缆修复方法及其绝缘增强机制研究[J].中国电机工程学报,2013,33(7):202-210.