雷电侵入波下牵引变压器绕组的谐振分析  

Analysis of Resonance in Traction Transformer Windings under Lightning Intrusion Wave

作　　者：张友鹏[1] 王虹 张昊磊 ZHANG Youpeng;WANG Hong;ZHANG Haolei(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070

出　　处：《铁道学报》2018年第11期41-47,共7页Journal of the China Railway Society

摘　　要：牵引变压器作为高铁牵引变电所内的核心设备,其运行安全与绕组绝缘情况息息相关。根据多导体传输线理论,搭建牵引变压器绕组以线匝为单位的单输入多输出模型,在该模型下推导出绕组的传递函数表达式,用以分析雷电侵入波下,谐振对绕组绝缘的影响。首先分析传递函数幅频特性,研究绕组中的谐振情况并对谐振可能导致的绕组绝缘击穿点进行定位;然后分析电容参数变化对绕组谐振情况产生的影响;最后在时域内进行验证计算,其结果符合谐振分析结果,验证了本文方法的正确性与可行性。结果表明:雷电波侵入后,绕组第一饼4～8匝线圈绝缘更易因谐振发生击穿,应重点对其进行防护。As the core equipment of high speed railway traction substation, the safety operation of traction transformer is closely related to insulation conditions of the windings. In order to analyze the effect of resonance on traction transformer winding insulation during the lightning wave intrusion, this thesis built the single input multiple output model of the transformer windings in turns and calculated the windings＇ transfer function based on multi conductor transmission line theory. Through the analysis of the amplitude frequency character istics of the transfer function, the resonance situation in the windings was analyzed to position the possible breakdown points that may be caused by the resonance. Then, the effects of the change in capacitance parame ters on the resonance situation of the windings were analyzed. Finally, according to the verification calculation in the time domain, the results can accord with those of the resonance analysis, which explained the feasibility and correctness of the proposed method. The results show that after the intrusion of lightning wave, the 4th to 8th turns from the first section of the windings are the places where insulation breakdown are more likely to ap pear . Thus, more attention should be paid on its protection.

关 键 词：牵引变压器 雷电侵入波 多导体传输线模型 传递函数 谐振频率 

分 类 号：U224.22[交通运输工程—道路与铁道工程]