风力发电机用层状复合绝缘的重复脉冲电树枝生长特性研究  

Growth Characteristics of Electrical Tree in Laminar Composite Insulation forWind Turbine Generator Under Repetitive Impulse Voltage

作　　者：段志强 刘学忠[2] 唐艳霞 刘冠芳 王景娜 黄娜 俞文斌 DUAN Zhiqiang;LIU Xuezhong;TANG Yanxia;LIU Guanfang;WANG Jingna;HUANG Na;YU Wenbin(CRRC YongJi Electric Co.,Ltd.,Xi'an 710016,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 710049,China;Xi'an Yonge Jieli Wind Energy Co.,Ltd.,Xi'an 710018,China)

机构地区：[1]中车永济电机有限公司,陕西西安710016 [2]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [3]西安中车永电捷力风能有限公司,陕西西安710018

出　　处：《绝缘材料》2022年第6期88-94,共7页Insulating Materials

基　　金：国家自然科学基金面上项目(51477133)、陕西省重点研发计划项目(2021GY-129)。

摘　　要：本文在重复脉冲电压下,对风力发电机用浸渍树脂与绝缘带的层状复合绝缘进行了电树枝生长特性试验,研究了脉冲电压重复率对环氧改性不饱和聚酯树脂与聚酰亚胺薄膜补强云母带复合绝缘试样中电树枝引发特性、形态特征以及生长曲线的影响,分析了电树枝沿绝缘带界面的生长特性。研究表明:在重复率分别为500、1000、2000 Hz和峰值为7 kV的双极性方波脉冲电压下,复合绝缘试样中的电树枝均呈枝状,且树枝较为稀疏;电树枝生长至绝缘带后将沿界面横向延伸,阻碍了电树枝径向生长,从而大幅延长了试样击穿的时间;随着脉冲重复率的增加,复合绝缘试样中电树枝的引发时间缩短、引发率提高、分支增加、放电通道变细、分形维数近似不变和平均径向生长率增大。Under repetitive impulse voltage,tests of the growth characteristics of electrical tree were conducted on laminar composite insulation consist of impregnating resin and insulating tape for wind turbine generator.The effect of impulse voltage repetitive rates on the electrical tree initiation characteristics,morphological features,and growth curve of the insulation composited by epoxy modified unsaturated polyester resin with polyimide film reinforced mica tape was studied.The growth characteristics of electrical tree extending feature along the interface of insulating tape was analyzed.The results show that under the bipolar square wave impulse voltage with the peak voltage of 7 kV and the repetitive rates of 500 Hz,1000 Hz and 2000 Hz,respectively,the electrical trees in samples are all branch-shaped and the branches are relatively sparse.The electrical tree extends laterally along the interface when it grows to the insulating tape,hindering the radial growth of the electrical tree,increasing the breakdown time of the sample.With the increase of the repetitive rate of the impulse,the initiation time of the electrical tree is shortened,the initiation rate is promoted,the branches increases and its discharge channels becomes thinner, the fractal dimension is almost unchanged, and the average radial growth rate increases.

关 键 词：电树枝 风力发电机 层状复合绝缘 方波脉冲电压 环氧改性不饱和聚酯 

分 类 号：TM215[一般工业技术—材料科学与工程]