Short-circuit forces, which result in violent vibration of power transformer windings, are induced by the interaction between the short-circuit currents and the leakage magnetic induction. During vibration, the rearrangements of disks affect the magnetic flux distribution, which leads to time-varying equivalent reactance and further changes of currents and forces. When a short-circuit accident occurs, these processes happen simultaneously and constantly. In this article, the influence of circuit parameters on short-circuit currents is analyzed. The strongly coupled phenomenon between equivalent circuit, magnetic field and structural field is explicated, and the method to obtain vibration process with strongly coupled phenomenon considered is proposed. Then the strongly coupled effect on vibration process is investigated. The vibration process is characterized by the time-varying currents, electromagnetic forces and displacements. The space coefficient is defined to represent the magnetic flux distribution. The changes of maximum value and its occurrence time of the characteristic parameters are obtained. The peak values of the short-circuit forces and displacements increase and the waveforms change, which is caused by the distortions of leakage magnetic flux and the changes of spatial ampere-turn balance during vibration. © 2024 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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强耦合电路-磁-结构效应对电力变压器绕组振动过程的影响

短路电流和漏磁感应之间的相互作用会产生短路力，导致电力变压器绕组剧烈振动。在振动过程中，圆盘的重新排列会影响磁通量分布，从而导致等效电抗随时间变化以及电流和力的进一步变化。当发生短路事故时，这些过程同时且不断地发生。本文分析了电路参数对短路电流的影响。阐述了等效电路、磁场和结构场之间的强耦合现象，提出了考虑强耦合现象的振动过程获取方法。然后研究了强耦合对振动过程的影响。振动过程的特征是随时间变化的电流、电磁力和位移。定义空间系数来表示磁通量分布。得到特征参数最大值的变化及其出现时间。振动过程中漏磁通畸变和空间安匝平衡变化导致短路力和位移峰值增大、波形变化。 © 2024 日本电气工程师协会。由 Wiley 期刊有限责任公司出版。