利用有限元法进行电力变压器绕组电动力的分析计算

利用有限元算法分析了三相电力变压器绕组各线匝在不同运行模式下电磁力的振动 ,并用电路参数的不同取值对应变压器的不同运行模式—空载、常态和短路 .分析结果表明 :内绕组在径向受到压力 ,外绕组在径向受到张力 ,内、外绕组轴向电磁力比径向力小很多 ,而相邻线饼或线匝间由于电磁力的原因存在相互挤压 .尤其在短路条件下 ,巨大的电动力将使变压器线圈产生变形 ,其局部或整体受到破坏 ,最后导致变压器发生故障

Computation of the Electromagnetic Force on Power Transformer Winding by Finite Element Method

Based on finite element method, the vibration of the electromagnetic force on power transformer cores is analyzed. The analysis result shows that, there is radial compression force on inner winding, and there is radial tensile force on outer winding; there are axial forces on inner and outer windings, and the axial forces are much less than corresponding radial forces; there is pressing force between adjacent cores or turns because of the electromagnetic forces, especially in the case of short-circuit, the enormous electromagnetic forces will make the winding deform, even partial or whole winding is damaged.