三元混合绝缘油雷电冲击流注放电发展特性仿真研究  

Development Characteristics of Lightning Impulse Discharge Streamer of Three-element Mixed Insulation Oil Based on Simulation Research

作　　者：张钧奕 郝建[1] 张静文 叶文郁 秦威 廖瑞金[1] ZHANG Junyi;HAO Jian;ZHANG Jingwen;YE Wenyu;QIN Wei;LIAO Ruijin(National Key Laboratory of Power Transmission Equipment Technology(Chongqing University),Chongqing 400044,China;State Grid Chongqing Electric Power Co.Electric Power Research Institute,Chongqing 401123,China)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学),重庆400044 [2]国网重庆市电力公司电力科学研究院,重庆401123

出　　处：《高电压技术》2024年第12期5435-5448,共14页High Voltage Engineering

基　　金：国家电网公司总部科技项目(5500-202327118A-1-1-ZN)。

摘　　要：为将三元混合绝缘油应用于更高电压等级变压器,考虑油品化学成分对油品电离能的影响,以及油品电离能随电场强度的变化规律,在传统流体动力学漂移扩散模型基础上,研究建立三元混合绝缘油流注放电仿真模型,仿真分析不同外施条件下三元混合绝缘油的流注放电发展特性,分析讨论三元混合绝缘油流注发展的混合平衡效应、尺寸效应和极性效应。结果表明:构建的三元混合绝缘油流注放电模型能更好的反应油品流注放电发展形貌;外施正极性电压越大,三元混合绝缘油流注放电发展长度激增的时刻出现得越早;针尖曲率半径减小,三元混合绝缘油流注放电的发展速度越快,但其主通道流注放电的直径越小;针-板电极间油隙距离减小,相同电压下三元混合绝缘油流注放电发展越剧烈;与矿物油、大豆基天然酯、棕榈基天然酯的流注放电发展特性相比,三元混合绝缘油流注放电发展过程中呈现由油品成分主导的混合平衡效应。In order to apply three-element mixed insulation oil to transformers with higher voltage levels,a simulation model of three-element mixed insulation oil streamer discharge was established on the basis of traditional fluid dynamics drift diffusion model,considering the influences of oil chemical composition on oil ionization energy and the variation law of oil ionization energy with electric field intensity.The characteristics of streamer discharge development of three-element mixed insulation oil under different application conditions were analyzed by simulation,and the effects of mixing balance,size and polarity were discussed.The results show that the three-element mixed insulation oil streamer discharge model established in this paper can better reflect the development morphology of oil streamer discharge.The larger the positive polarity voltage applied,the earlier the time of the surge in the development length of the three-element mixed insulation oil stream discharge.With the decrease of the tip curvature radius,the development speed of the stream-er discharge is faster,but the diameter of the main channel streamer discharge is smaller.With the decrease of the oil gap distance between the pin-plate electrodes,the development of the three-element mixed insulation oil streamer discharge becomes more severe under the same voltage.Compared with the development characteristics of mineral oil,soya-based natural ester and palmit-based natural ester,the mixing balance effect dominated by oil composition is presented in the development process of three-element mixed insulation oil.

关 键 词：变压器 混合绝缘油 电离能 流注放电 雷电冲击 

分 类 号：TM215.4[一般工业技术—材料科学与工程]