大型电力变压器内绕组径向屈曲分析

Analysis of radial buckling on inner winding of large-scale power transformer

为了提高变压器绕组抗短路能力,阐述了用有限元法分别建立3种单跨度模型和1种有弹支多跨度模型的过程,对大型电力变压器内绕组在承受短路电磁力时径向屈曲临界载荷值进行了对比分析,并采用多跨模型模拟了绕组在具有初始几何缺陷时其屈曲临界载荷值的变化。分析结果表明,使用先进的绕制方式能提高电力变压器安全裕度和绕组抗短路电磁力的能力。

Abstract： In order to enhance the anti - short circuit ability of transformer winding, this paper expounds the process of three single - span models and a multi - span model with spring retainer which are established by infinite element method, compares the radial buckling critical load on inner winding of large - scale power transformer under the short - circuit electromagnetic force and simulates the change of load by the multi - span model under the initial ge- ometrical imperfection. The analysis proves that the advanced winding mode is able to enhance the safety margin of power transformer and the ability of winding to withstand short circuit electromagnetic force.