【摘要】 以"场-路耦合"原理为基础,以Mag Net有限元软件为平台,针对一台80 000 k VA/110 k V双绕组有载调压电力变压器,分别建立调压绕组不同分接情况下计及绕组不平衡安匝的二维有限元模型。基于考虑铁心材料非线性的影响,采用瞬态非线性求解,对该模型的瞬态漏磁场进行分析,计算出变压器螺旋式绕组的辐向短路力与切向短路力。对二者进行合成得到螺旋式绕组短路工况下的辐向短路合力并对其进行稳定性校核,对螺旋式绕组在切向短路力作用下确保其稳定性的临界压应力进行了推算。结果表明,可应用文中理论与模型对螺旋式绕组辐向短路合力进行计算与稳定性分析。更多还原

【Abstract】 On the basis of the principle of "circuit- field couple",with the finite element software Mag Net as a platform,aiming at the 80 000 k VA /110 k V double- winding on- load voltage regulating transformer,this paper respectively established the structure of 2D finite element model considering winding’s unbalanced ampere- turns with different tapping of voltage regulating winding. Considering the influence of non- linearity of core material,this paper adopted the nonlinear solver of the transient field to analyze the transient leakage magnetic field on the model,and calculated the transformer helical winding radial short- circuit force and tangential short- circuit force.On the syntheses of these force,in order to get the radial short- circuit resultant force and check the stability of transformer,this paper also calculated critical preloading force under the helical winding tangential short- circuit force to ensure the stability in transformer. The result shows that the theory and model succeed in calculating radial short- circuit resultant force and accounting radial mechanical strength.更多还原