多次冲击条件下的大型变压器绕组辐向失稳

发布时间：2018-03-11 12:48

本文选题：非线性屈曲　切入点：多次短路冲击　出处：《电工技术学报》2017年S2期 　论文类型：期刊论文

【摘要】：建立了短路实验变压器的三维有限元模型,对残余形变量进行了计算,计算过程中考虑了材料的弹塑性变化,并根据短路实验中位移测量值对计算结果进行了校验;其次,针对多次短路冲击的累积效应,采用考虑初始缺陷的屈曲分析方法,对多次短路辐向失稳问题进行了研究;最后,通过对比安全系数阐明了短路冲击次数、一次短路后支撑结构失效对绕组短路稳定性的影响。结果表明仿真能够较精确地计算变压器短路实验位移值,误差不超过10%,短路冲击次数对辐向失稳安全系数有较大影响;支撑结构与辐向失稳安全系数的关系应分情况讨论。
[Abstract]:The three-dimensional finite element model of short-circuit experimental transformer is established, and the residual shape variable is calculated. The elastic-plastic change of the material is considered in the calculation process, and the calculated results are verified according to the displacement measured in the short-circuit experiment. According to the cumulative effect of multiple short circuit impact, the problem of multiple short circuit radial instability is studied by using the buckling analysis method considering the initial defect, and finally, the times of short circuit impact are illustrated by comparing the safety factor. The results show that the experimental displacement of transformer short circuit can be calculated accurately and the error is not more than 10. The frequency of short circuit impact has a great influence on the radial instability safety factor. The relationship between the bracing structure and the radial instability safety factor should be discussed separately.
【作者单位】：国家工程中心特种电机研究所(沈阳工业大学);
【基金】：国家自然科学基金资助项目(51177103)
【分类号】：TM41

【相似文献】