基于变压器缩比模型的绕组冲击电压分布  

Winding Impulse Voltage Distribution Based on Transformer Reduced-scale Model

作　　者：杨庆[1] 陈勇[1] 司马文霞[1] 赵洪彬 刘红文 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]云南电网有限责任公司电力科学研究院,昆明650217

出　　处：《高电压技术》2016年第12期3955-3963,共9页High Voltage Engineering

基　　金：国家创新研究群体基金(51321063);中央高校基本科研基金(106112014CDJZR155501;CDJZR14150001);重庆大学输配电装备及系统安全与新技术国家重点实验室资助研究项目(2007DA10512713206)~~

摘　　要：实际运行的电力变压器绕组无抽头引出线,无法直接测量其冲击电压分布。采用电气特性相似并带抽头的变压器缩比模型代替原模型进行绕组冲击电压分布研究具有重要的工程实用价值。首先在缩比模型和原模型各种物理特性常数和电场强度相同的条件下,根据物理量间的关系,推导了较简化的缩比准则;然后根据实际电力变压器原模型和缩比准则设计了一台相似比为1/20和型号为10 k VA、220 V/2 400 V且带抽头的变压器缩比模型;其次,用有限元仿真软件COMSOL Multiphysics进行了缩比模型与原模型的电场、磁场和电磁场综合仿真对比分析,验证了该缩比准则的正确性。最后,搭建试验平台测量变压器缩比模型在纳秒脉冲下的绕组冲击电压分布。得出变压器绕组冲击电压分布极不均匀,高压端承受电压较大。The impulse potential distribution in actual power transformer winding（due to possessing no tap pin ）can not directly be measured. Using similar electric property and tapped transformer model instead of the original model to re- search the measuring impulse voltage distribution has important engineering practical value. To research all kinds of physical constants and ,electric field intensity under the same conditions between reduced-scaled and original models, ac- cording to the relationship between physical quantities, we established a simplified shrinkage ratio criterion. Secondly, according to the actual power transformer original model and shrinkage ratio criterion, we designed a similar ratio 1/20, typed 10 kVA-220 V/2 400 V tapped transformer reduced-scaled model. Then, using the finite element simulation soft- ware COMSOL Multiphysics, we simulated the reduced-scaled and original models of the electric field, magnetic field, and electromagnetic field. Finally, we established a test platform to measure the winding impulse voltage distribution of transformer reduced-scaled model under ns pulse voltage. The comprehensive and comparative analyses of the simulation verify the correctness of the rule of shrinkage ratio. It is found that the impulse voltage distribution of transformer wind- ing is uneven and high-voltage side withstanding voltage is higher.

关 键 词：缩比模型 相似比 有限元 变压器 缩比准则 电压分布 纳秒脉冲 

分 类 号：TM41[电气工程—电器]