基于对轴向压缩过程的静态分析,研究了变压器绕的非线性振动
Liu Jun1,2, Hao Yuefeng3, Dong Zijian4
1College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China.
Scientific reports
|October 7, 2025
概括
短路期间的变压器上振动是关键的. 一个新的静态动态框架准确地预测了轴移位,揭示了预负载.
科学领域:
- 电气工程 电气工程
- 机械工程 机械工程
- 材料科学 材料科学 材料科学
背景情况:
- 在短路冲击下变压器绕线的轴震动对机械稳定性和运行可靠性是一个重大问题.
- 现有的动态分析方法往往忽略了预应力平衡状态,导致不准确的振动预测.
- 由于绕线自重造成的前载荷分布不均,可能会在短路过程中损害结构完整性.
研究的目的:
- 开发和验证一个合的静态动态框架,用于分析变压器绕线轴振动.
- 调查预装载对绕线振动特性和结构稳定性的影响.
- 为优化变压器设计和保护策略应对短路力提供实际指导.
主要方法:
- 采用了结合的静态动态框架,集成非线性模拟和实验验证.
- 进行了静态分析,以评估轴向压力和预负荷分布,考虑绕自重.
- 动态模拟包括时间变化的电磁力,实验监测使用纤维布拉格格传感器.
主要成果:
- 事实上,子的实际应力低于设计目标,导致预加载不均.
- 轴位移振幅显示了末端受约束的特征,最大的振幅在上中和下中区域.
- 充足的预加载确保了连续接触和结构稳定性,而不足的预加载导致了暂时的解压.
结论:
- 拟议的静态动态框架显著提高了变压器绕振动预测的准确性.
- 优化预负载水平,布局和保护协调对于改善变压器短路承受能力至关重要.
- 实验验证有质地证实了模拟结果,突出了连续短路事件的影响.
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