CAJ | 학술논문

变压器绕组并联导线间的环流将导致绕组损耗增加、局部过热,从而影响变压器的正常运行。本文以变压器单螺旋绕组为研究对象,建立了计算并联导线支路电流的场路耦合数学模型,模型中将各支路电流作为独立的变量来组集刚度矩阵,体现了求解问题的特殊性。在此基础上,对不同换位形式的支路电流分布及影响因素进行了研究,通过短路感抗和二次侧感应电流两个参数的设计与计算值比较,证明了本文模型的合理性。研究表明,在相同的条件下,＂424＂换位具有环流损耗小的优点,但相对于＂212＂换位,其抑制损耗的效果并不明显,考虑到＂212＂换位在均化电流分布及抑制局部过热方面的优点,单螺旋绕组的三种不完全换位应首选＂212＂换位。
변압기요조병련도선간적배류장도치요조손모증가、국부과열,종이영향변압기적정상운행。본문이변압기단라선요조위연구대상,건립료계산병련도선지로전류적장로우합수학모형,모형중장각지로전류작위독립적변량래조집강도구진,체현료구해문제적특수성。재차기출상,대불동환위형식적지로전류분포급영향인소진행료연구,통과단로감항화이차측감응전류량개삼수적설계여계산치비교,증명료본문모형적합이성。연구표명,재상동적조건하,＂424＂환위구유배류손모소적우점,단상대우＂212＂환위,기억제손모적효과병불명현,고필도＂212＂환위재균화전류분포급억제국부과열방면적우점,단라선요조적삼충불완전환위응수선＂212＂환위。
Transformer windings circulating currents between parallel conductors will lead to loss increasing and local overheating, which will affect the operation of transformer. Based on field-circuit coupled method, the finite element model and mathematical model of single spiral winding transformer are established. The field-circuit coupled model takes every branch current as independent variable to make up of the stiffness matrix. The branch currents of different transposition patterns are calculated and their influence factors are analyzed. The calculation results of induced current and short-circuit impedance are well matched with the designed values, which demonstrates that the method in this paper is effective. At the same time, this research also shows that in the same conditions, the ＂424＂ transposition has the advantage of small circulation current losses, but it is not obviously in inhibiting circulation current losses compared with the ＂212＂ transposition. In view of the uniform distributions of branch currents and losses, the ＂212＂ transposition should be the best choice in the three transposition patterns of single spiral winding.