| 引用本文: | 王欢,李岩.考虑残余应力的大型电力变压器绕组短路强度计算与分析[J].电力自动化设备,2018,(1): |
| WANG Huan,LI Yan.Calculation and analysis of short circuit strength of large-scale power transformer windings considering residual stress[J].Electric Power Automation Equipment,2018,(1): |
|
| 摘要: |
| 在电力变压器绕组绕制过程中，绕组截面存在部分残余应力，会对绕组抗短路强度产生不利的影响，现有电力变压器绕组短路强度研究没有对该部分应力予以考虑。推导了圆环形绕组绕制过程中产生残余应力的计算模型，以试验变压器为例对内绕组的辐向短路强度进行了仿真计算，考虑了绕制过程中产生残余应力的影响，并采用国家标准中部分强度考核指标进行了对比校验，结果表明绕制过程中产生的应力同时包含压缩和拉伸分量，残余应力对电力变压器抗短路强度有不利的影响，对环形压缩应力影响较小，对辐向翘曲应力影响较大；所提变压器绕组短路强度计算模型能够考虑残余应力的影响，通过对比试验测量值验证了数值计算模型的准确性。 |
| 关键词: 电力变压器 短路强度 残余应力 有限元分析 |
| DOI：10.16081/j.issn.1006-6047.2018.01.015 |
| 分类号:TM41 |
| 基金项目:国家自然科学基金资助项目(51177103) |
|
| Calculation and analysis of short circuit strength of large-scale power transformer windings considering residual stress |
|
WANG Huan, LI Yan
|
|
Institute of Special Motors, Shenyang University of Technology, Shenyang 110870, China
|
| Abstract: |
| In the process of power transformer conductor winding, some residual stress exists in the winding section, which has unfavorable effects on the anti-short circuit strength of winding. The existing research on the short circuit strength of power transformer winding does not consider this part of stress. The calculation model of the residual stress in the circular conductor winding process is deduced. Taking the test transformer as an example, considering the effects of the residual stress in the conductor winding process, the radial short circuit strength of inner winding is simulated and calculated, which is checked by some strength assessment indicators in the national standard. Results show that the stress in the conductor winding process includes compressive and tensile components and the residual stress has adverse effects on the anti-short circuit strength of power transformer windings: smaller effects on annular compressive stress and greater effects on radial warping stress. The proposed calculation method of short circuit strength of power transformer windings considers the effects of residual stress, whose accuracy is verified by comparison test measurements. |
| Key words: power transformers short circuit strength residual stress finite element analysis |
