0～-50℃交联聚乙烯材料的电树枝生长特性
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摘要
交联聚乙烯材料在电力电缆中有着广泛的应用,且电树枝生长特性是绝缘可靠性研究的重要基础。针对交联聚乙烯电缆的轻负荷及低温运行条件,设计了一套可多试样同时进行电树枝实验的电极装置,研究了温度对电树枝引发和生长特性的影响。在0~-50℃范围进行了不同温度下的电树枝实验并与+25℃时进行对照,结果表明:温度对电树枝的引发、生长速度和电树枝形貌有着重要影响。电树枝50%起始电压随温度的降低而升高,且温度越低其增加幅度越小;低温对电树枝生长速度有抑制作用,且温度越低越明显;低温环境下的电树枝存在两种典型形貌,且电树枝的起始位置也有别于+25℃。
Cross-linked polyethylene has been widely used in the power cable,and the growth of electrical tree is significant foundations in the researching of insulation reliability. Considering the situation that Cross-linked polyethylene cable worked in the condition of light load and low temperature in extreme weather,a set of electrode device that multiple samples can be tested at a time was used in the experimental system in order to research the initiation and the growing behaviors of electrical tree in cross-linked polyethylene under different temperatures. The experiments of electrical tree were carried out under different temperatures from 0℃ to-50℃,and used the one under + 25℃ as the comparison,it showed that temperature had a significant impact on the initiation、growth speed and the typical morphology of electrical tree. As the falling of temperature,the 50% initiation voltage increased obviously,and the increasing range was getting smaller as the temperature getting lower. The low temperature had some inhibitory impacts on the growth speed of electrical tree,and the lower temperature,the more obvious effect.There were two particular types of morphology in low temperature environment,and the growth site of electrical tree was different from the one growing in + 25℃.
Cross-linked polyethylene has been widely used in the power cable,and the growth of electrical tree is significant foundations in the researching of insulation reliability. Considering the situation that Cross-linked polyethylene cable worked in the condition of light load and low temperature in extreme weather,a set of electrode device that multiple samples can be tested at a time was used in the experimental system in order to research the initiation and the growing behaviors of electrical tree in cross-linked polyethylene under different temperatures. The experiments of electrical tree were carried out under different temperatures from 0℃ to-50℃,and used the one under + 25℃ as the comparison,it showed that temperature had a significant impact on the initiation、growth speed and the typical morphology of electrical tree. As the falling of temperature,the 50% initiation voltage increased obviously,and the increasing range was getting smaller as the temperature getting lower. The low temperature had some inhibitory impacts on the growth speed of electrical tree,and the lower temperature,the more obvious effect.There were two particular types of morphology in low temperature environment,and the growth site of electrical tree was different from the one growing in + 25℃.
引文
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[18]韩宝忠,高思明,李春阳,等.纳米石墨/聚乙烯复合材料电导特性模拟仿真[J].哈尔滨理工大学学报,2014,19(1):90-94.
[19]王雅妮,李光道,吴建东,等.添加纳米Mg O对交联聚乙烯中直流接地电树枝的影响[J].南方电网技术,2015,9(10):26-30.
[20]KOSAKI M,SHIMIZU N,HORII K.Treeing of Polyethylene at77K[J].IEEE Transactions on Electrical Insulation,1977,EI-12(1):40-45.
[21]王晓娟,龚志强,任福民,等.1960-2009年中国冬季区域性极端低温事件的时空特征[J].气候变化研究进展,2012,8(1):8-15.
[2]屠德民.从工程电介质进展看前沿课题[J].电工技术学报,2005,20(1):8-15.
[3]李盛涛,郑晓泉.聚合物电树枝化[M].机械工业出版社,2006.
[4]马丽婵,郑晓泉,谢安生.交联聚乙烯电缆中电树枝的研究现状[J].绝缘材料,2007,40(5):49-52.
[5]陈向荣,徐阳,王猛,等.高温下110k V交联聚乙烯电缆电树枝生长及局部放电特性[J].高电压技术,2012,38(3):645-654.
[6]吴倩,刘毅刚.高压交联聚乙烯电缆绝缘老化及其诊断技术述评[J].广东电力,2003,16(4):1-6.
[7]CHAMPION J V,DODD S J,ALISON J,et al.Electrical Tree Growth and Space Charge Behaviour of Epoxy Resin Blends[C]//IEEE,International Conference on Conduction and Breakdown in Solid Dielectrics,1998:321-324.
[8]CHEN X,XU Y,CAO X,et al.Electrical Treeing Behavior at High Temperature in XLPE Cable Insulation Samples[J].IEEE Transactions on Dielectrics&Electrical Insulation,2015,22(5):2841-2851.
[9]CHEN G,THAM C.Electrical Treeing Characteristics in XLPE Power Cable Insulation in Frequency Range between 20 and 500Hz[J].Dielectrics&Electrical Insulation IEEE Transactions on,2009,16(1):179-188.
[10]梁志钰,姚建国.低温下聚合物的树枝状放电[J].清华大学学报:自然科学版,1991(1):20-25.
[11]WU W,FENGNIAN H.Mechanical and Dielectric Assessment of Ultrahigh Molecular Weight Polyethylene Insulation for Cryogenic Applications[J].IEEE Transactions on Electrical Insulation,1992,27(3):504-512.
[12]谢安生,李盛涛,郑晓泉.高频电压下交联聚乙烯电缆绝缘中电树枝生长的动力学模型[J].物理学报,2008,57(6):3828-3833.
[13]郑晓泉,CHEN G,DAVIES A.E.交联聚乙烯电缆绝缘中的电树枝与绝缘结构亚微观缺陷[J].电工技术学报,2006,21(11):28-33.
[14]廖瑞金,郑升讯,杨丽君,等.不同温度下XLPE电缆中电树枝的生长特性[J].高电压技术,2010,36(10):2398-2404.
[15]迟晓红.纳米蒙脱土/聚烯烃复合材料结构形态与电树生长机理研究[D].哈尔滨:哈尔滨理工大学,2015.
[16]张金梅.PE/MMT纳米复合材料结晶形态与树枝放电特性研究[D].哈尔滨:哈尔滨理工大学,2009.
[17]王颖剑.纳米Mg O/LDPE与Si O_2/LDPE电树枝生长特性[D].哈尔滨:哈尔滨理工大学,2012.
[18]韩宝忠,高思明,李春阳,等.纳米石墨/聚乙烯复合材料电导特性模拟仿真[J].哈尔滨理工大学学报,2014,19(1):90-94.
[19]王雅妮,李光道,吴建东,等.添加纳米Mg O对交联聚乙烯中直流接地电树枝的影响[J].南方电网技术,2015,9(10):26-30.
[20]KOSAKI M,SHIMIZU N,HORII K.Treeing of Polyethylene at77K[J].IEEE Transactions on Electrical Insulation,1977,EI-12(1):40-45.
[21]王晓娟,龚志强,任福民,等.1960-2009年中国冬季区域性极端低温事件的时空特征[J].气候变化研究进展,2012,8(1):8-15.