计算机科学 ›› 2025, Vol. 52 ›› Issue (11A): 240800082-11.doi: 10.11896/jsjkx.240800082
郝越峰1, 刘君2, 许逵3, 徐舒蓉2, 石林涛1, 陆禹初1
HAO Yuefeng1, LIU Jun2, XU Kui3, XU Shurong2, SHI Lintao1, LU Yuchu1
摘要： 随着电网容量和覆盖范围的扩展,变压器出口处短路故障日益频繁。为了减小未考虑重合闸二次冲击对电力变压器抗短路校核的影响,基于第四强度理论和轴向及辐向失稳准则,提出了一种计及短路重合闸影响的电力变压器机械稳定性评估方法。首先,通过场-路耦合法模拟了短路重合闸工况,计算出短路过程中变压器绕组的电流大小、漏磁分布和电磁力密度。在此基础上进行了有限元模型的二维轴对称简化,并使用高阶多项式拟合构建了用于变压器绕组漏磁密度快速预测的代理模型,以提高电力变压器在短路条件下性能校核的计算效率,并为变压器抗短路能力的快速评估提供了一种新的途径。接着,通过电磁-结构场顺序耦合分析了绕组承受的冯·米塞斯应力和短路电动力作用下发生的位移及残余变形。最后,综合最小屈服失效系数以及多维度的结构失稳判据对变压器在短路电磁载荷作用下的机械稳定性进行校核,并阐述了基于云边协同的在运变压器动稳评估与预警体系的构建方案。实施该评估方法有效提升了变压器绕组稳定性校核的准确性,并为变压器维护与故障预防提供了科学支撑。
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