1000MW水轮发电机汇流铜环电磁力分析

Analysis of Electromagnetic Force Applied on Copper Bars for a 1000 MW Hydro-generator

大型水轮发电机在突然短路故障下,巨大的冲击电流将在铜环间产生强大的冲击电磁力,给端部铜环的固定结构造成威胁。针对这一实际工程问题,以1台1000MW水轮发电机为研究对象,从其电磁力产生的原理出发,首先通过仿真得到了故障电流大小,接着运用电磁场有限元方法,求解了汇流铜环在故障电流激励下端部磁场中承受的电磁力。计算考虑了三相、两相突然短路,并在圆周上求取了多个截面,计算结果为电机结构设计提出了定量的要求,具有实际工程应用价值和参考意义。

Under sudden short circuit failure condition,the huge current will generate tremendous electromagnetic force in copper bars in large capacety generator,endangering the fixing structure at the end part.This paper chooses 1 000 MW hydro generator as an investigating object,where the fault current is obtained by simulation.FEA method is employed to calculate the copper bar electromagnetic force under sudden short circuit failure condition,taking into account the 3 and 2 phase short circuit type,and choosing multiple sections to get the maximum value.The results provide a reasonable reference for design of the end part of generator.