可替代型气制变压器油中流注分叉特性及其机理研究  

Research on characteristics and mechanism of streamer branching in alternative gas-to-liquid transformer oil

作　　者：张浩 李珂 许红运 王哲铭 周文强 卢武 ZHANG Hao;LI Ke;XU Hongyun;WHANG Zheming;ZHOU Wenqiang;LU Wu(School of Electric Engineering,Shanghai University of Electric Power,Shanghai 200090,China;State Grid Rizhao Power Supply Company,Rizhao 276800,China;East China Branch of State Grid Co.,Ltd.,Shanghai 200120,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]国网日照供电公司,山东日照276800 [3]国家电网有限公司华东分部,上海200120

出　　处：《绝缘材料》2023年第12期54-62,共9页Insulating Materials

基　　金：国家自然科学基金资助项目(51707113);上海市“晨光计划”项目(21CGA63)。

摘　　要：以基于天然气制油技术的异构非环烷基变压器油和传统的环烷基变压器油作为研究对象,在正极性雷电冲击电压下对25 mm针-板电极结构中的油中流注分叉形态进行了观测。对获取的流注放电图像进行多重分形分析,求取多重分形参量作为流注分叉模式的分类评价指标。结果表明:当外加电压低于加速电压时,两种油样中流注分叉过程均可归为侧枝和主枝平稳增长分别占主导的两阶段模型;当外加电压高于加速电压时,环烷基油中流注分叉过程为侧枝平稳增长、主枝平稳增长和跃迁式增长分别占主导的三阶段模型,而气制油中流注分叉过程只包含主枝平稳增长和跃迁式增长两个阶段。进一步的理论分析表明,气制油成分较高的电离能导致空间电荷与原生电场的博弈效应减弱是造成其在加速电压下流注分叉模型发生突变的主要原因。In this paper,the heterogeneous non-naphthenic transformer oil based on natural gas-to-liquid technology and traditional naphthenic transformer oil were used as research object.The streamer branching patterns in oil samples in the 25mm point-to-plate electrode system was observed under positive lightning impulse voltage.The streamer discharge images were conducted multifractal analysis to obtain the multifractal parameters as the classification and evaluation index of streamer branching morphology.The results show that when the applied voltage is lower than the accelerated voltage,the streamer branching process in the two oil samples can be classified as a two-stage model dominated by the steady growth of side branch and main branch.When the applied voltage is higher than the accelerated voltage,the streamer branching process in naphthenic oil is a three-stage model,each stage dominated by steady growth of side branch,steady growth of main branch,and rapid growth of main branch,respectively,and the streamer branching process in gas-to-liquid transformer oil only includes two stages,which are steady growth stage of main branch and rapid growth stage of main branch.Further theoretical analysis shows that the competition between space charge and primary electric field is distorted due to the higher ionization energy of gas-to-liquid transformer oil components,which is the main reason for the abrupt change of streamer branching model in gas-to-liquid transformer oil under accelerating voltage.

关 键 词：天然气制油 流注放电 多重分形 分叉特性 空间电荷 

分 类 号：TM214[一般工业技术—材料科学与工程]