基于Comsol的变压器绕组短路力分布研究

Research on Short Circuit Force Distribution of Transformer Windings Based on Comsol

准确地掌握变压器遭受短路电流时绕组短路所承受的短路力分布,不仅有助于预防和消除设计盲区,还可以及时发现安全隐患,避免更大事故发生,因而对变压器绕组的承受短路力分布进行研究具有重要的现实意义。本研究基于实际运行的1台220 k V电力变压器的结构参数,结合有限元仿真软件Comsol建立了变压器仿真模型。通过加载不同类型的短路电流,对比分析了二维仿真模型与三维仿真模型绕组的短路力分布差异,归纳总结了变压器承受短路力分布的总体规律。研究结果表明,本类型的变压器承受的短路力主要分布于绕组的上下1/3-1/5处,最大承受短路力位于绕组下部约1/5处。通过与变压器实际运行情况对比验证,证明本结果与实际短路情况较为符合,具有一定的借鉴意义。

Accurate knowledge of the short-circuit power distribution of windings when suffering short circuit cur- rents, not only can help to prevent and eliminate blind design, but also can detect security risks to avoid further acci- dents. Thus the research of short-circuit power distribution of windings has important practical significance. In this study,based on an actual operation of the structural parameters of 220 kV power transformers, we established trans- former simulation model combined with the finite element simulation software Comsol. By loading different types of short-circuit current ,we analyzed the two-dimensional simulation model and three-dimensional simulation model of the short-circuit winding force distribution comparativly,we summarized the distribution of short circuit power rules. The results show that：this type of transformer to withstand short-circuit power is mainly distributed in 1/3-1/5 of the upper and lower winding, the maximum force to withstand short circuit power is in the lower part of the winding about 1/5. Through comparing with the actual operation of the transformer, it is proved that the result is in line with the ac- tual short circuit,which has a certain reference value.