雷电冲击下换流变压器的缩比模型设计与测试  

Design and Test of the Reduced-scaled Model of Converter Transformer Under Lightning Impulse

作　　者：普子恒[1] 刘路 方春华[1] 张亚东[2] PU Ziheng;LIU Lu;FANG Chunhua;ZHANG Yadong(College of Electrical Engineering and New Energy, China Three Gorges University, Hubei Yichang 443002, China;School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]武汉大学电气工程学院,武汉430072

出　　处：《高压电器》2019年第4期96-101,共6页High Voltage Apparatus

基　　金：国家电网公司重大科技项目(52153213020Z)~~

摘　　要：换流变压器进行雷电冲击耐压试验研究周期长、代价高,而利用缩比模型进行试验研究具有良好的经济性,且利于试验数据的获取,并可与仿真结果进行对比分析。为设计与原模型电气特性一致的缩比模型,本文推导了雷电冲击下变压器的缩比公式,设计了缩比模型,对缩比模型和原模型在相似激励下的电场和磁场分布进行了仿真对比,并利用多导体传输线模型计算了缩比模型与原模型在雷电冲击下的绕组电压波形,原模型与缩比模型误差在5%以内。对缩比模型进行了绕组分布电压测量,结果表明,引出线结构会影响绕组电气特性,需进一步研究修正方法。The experimental study on the large transformer under the lightning impulse voltage is of long period and high cost. The experimental study on the reduced-scaled model has good economic performance, and it is easy to obtain valid data. The results can be compared with the simulation results. In order to design a scaled model with the elec-trical characteristics of the original model, the similarity formulas of the transformer under lightning impulse voltage are derived according to the similarity theory. The reduced-scaled model is designed. The electric field and magnetic field distribution of the original model and similarity model under corresponding motivation are studied by simulation. The winding voltage waveforms of the original model and similarity model under corresponding impulse voltage are calculated by multi-conductor transmission line model. The error between the original model and the scaled model is less than 5%. The distribution voltage distribution of winding is measured. The results show that the structure of the outgoing lines affects the electrical characteristics of the winding. It is necessary to further study the correction method.

关 键 词：换流变压器 雷电冲击 缩比模型 绕组电压分布 

分 类 号：TM40[电气工程—电器]