摘要
为研究多环境因素对换流变压器阀侧典型油纸绝缘结构电场分布的影响,在-20℃~80℃以温度和含水率为变量对变压器油和浸油纸板进行电导率和相对介电常数的测量。建立换流变压器阀侧主绝缘模型,利用实测数据建立动态材料属性,通过仿真得到不同温度、含水率在外施电压幅值为800kV的纯交流、83%直流含量、87.5%直流含量以及纯直流条件下的油纸绝缘结构电场分布。研究结果表明:当温度为-20℃或0时浸油纸板电导率随电场强度升高呈先降后升的趋势,而当温度为20℃或80℃时浸油纸板电导率随电场强度呈上升趋势。温度、含水率和外施电压直流含量均会对油纸绝缘电场分布产生影响,最大场强的位置会随外施电压直流分量与浸油纸含水率的变化而改变;运行温度下换流变主绝缘承受的场强高于常温下;水分会使绝缘纸板电导率明显上升甚至高过绝缘油,导致油中场强高于纸板中。
In order to study the influence of multiple environmental factors on the electric field distribution of the typical oil-paper insulation structure on the valve side of the converter transformer, the electrical conductivity and relative mediation of transformer oil and oil-impregnated paperboard were measured at-20 ℃-80 ℃ with temperature and moisture as variables. The oil-paper insulated valve side winding model of the converter transformer was established, and the material attribute was assigned as a dynamic value with temperature and moisture according to measured data. Through simulation, the electric field distribution of the oil-paper insulation structure under different temperature, moisture and applied voltage amplitude of 800 kV pure AC, 83% DC content, 87.5% DC content and pure DC conditions are obtained. Research indicates: When the temperature is-20 ℃ or 0, the electrical conductivity of oil-impregnated cardboard decreases first and then rises as the electric field strength increases, and conductivity increases with electric field strength when the temperature is 20 ℃ or 80 ℃. Temperature, moisture and DC content of the applied voltage all affect the electric field distribution of the oil-impregnated paper insulation, and the position of the maximum field strength is changed with the DC content of the applied voltage and the moisture content of the oil-impregnated paper. The field strength of the main insulation of the converter transformer at operating temperature is higher than that at room temperature. Moisture increases conductivity of oil-impregnated cardboard significantly or even higher than the conductivity of the insulating oil, resulting in higher electric field strength in the oil than in the oil-impregnated cardboard.
作者
池明赫
李毅恒
罗青林
张潮海
孙文鑫
关毅
陈庆国
CHI Ming-he;LI Yi-heng;LUO Qing-lin;ZHANG Chao-hai;SUN Wen-xin;GUAN Yi;CHEN Qing-guo(Key Laboratory of Engineering Dielectrics and Its Application,MOE,Harbin University of Science and Technology,Harbin 150080,China;TBEA,Changji 750306,China;School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150006,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2021年第5期71-79,共9页
Electric Machines and Control
基金
国家重点研发计划资助(2017YFB0902704)
国家自然科学基金面上项目(51677046&51877056)
中国博士后基金(43XB3822XB)。
关键词
油纸绝缘
温度
水分
电场分布
动态参数
过渡时间
oil-paper insulation
temperature
moisture
electric field distribution
dynamic parameters
transition time
作者简介
池明赫(1985-),男,博士,副教授,研究方向为变压器油纸绝缘特性;李毅恒(1995-),男,硕士研究生,研究方向为高电压绝缘技术;罗青林(1964-),男,博士,教授级高工,研究方向为变压器类产品绝缘结构研究与新技术开发;张潮海(1963-),男,博士,教授,博士生导师,研究方向为电气绝缘、等离子体及其应用技术;孙文鑫(1995-),男,硕士,研究方向为高电压绝缘技术;通信作者:关毅(1987-),女,博士研究生,研究方向为高电压绝缘技术;陈庆国(1970-),男,博士,教授,博士生导师,研究方向为高电压绝缘、电力设备绝缘检测及高电压应用新技术。
