摘要
本文以一台17000kVA三相变压器为模型,用有限单元法计算了在额定电压、不同初相角下突然短路时,变压器内的漏磁场,并由此算出了线圈上的恒定、50Hz和100Hz的轴向和幅向电磁力.研究表明,幅向电磁力用传统的设计公式即可得到满足工程要求的结果;至于轴向力,则必须用数值法才能得到准确值.
In this paper, the leakage magnetic field and the radial and axial electromagnetic forces acting on the windings of a 3 phase power transformer under S-C condition are calculated by FE method. The electromagnetic forces can be expressed by 3 components, i.e D.C, 50Hz and 100Hz components. The formulas of forces and force densities are derived and the numerical values for a 17000 kVA model transformer are calculated and compared with design data, the influence of core window is discussed. Finally, some useful conclusions are obtained.
关键词
变压器
线圈短路电流
电磁力
power transformer
short-circuit electromagnetic force
