CAJ | 학술논문

跨线运行的电气机车，由直流供电时其变压器用作滤波电抗器。本文针对一台心式结构且具有4个高压和4个低压(牵引)绕组的机车变压器在直流供电时的有关电磁特性进行了研究。此时，高压绕组并联开路，低压绕组两两串联分别接入两个直流回路中用于滤波，两个直流回路或同时工作或单独工作。按同一铁心柱上两个绕组串联连接，则4个低压绕组有4种接法。文章在用 ANSYS 软件对磁场进行深入分析的基础上，计算了绕组间的电感矩阵及相应连接时的电感。同时，深入研究了4个低压绕组两两串联后或同时工作或单独工作时电感值随负载电流变化的特性，推荐了直流制式下变压器用作滤波电抗器时其低压绕组一种较合适的连接方式，且这种连接方式的电感计算值得到了试验验证。文章最后还针对所推荐的连接方式，在单回路工作时较双回路工作时所呈现的电感值差异，提出了一种增设第三绕组的补偿方案，并就有关问题进行了分析。
과선운행적전기궤차，유직류공전시기변압기용작려파전항기。본문침대일태심식결구차구유4개고압화4개저압(견인)요조적궤차변압기재직류공전시적유관전자특성진행료연구。차시，고압요조병련개로，저압요조량량천련분별접입량개직류회로중용우려파，량개직류회로혹동시공작혹단독공작。안동일철심주상량개요조천련련접，칙4개저압요조유4충접법。문장재용 ANSYS 연건대자장진행심입분석적기출상，계산료요조간적전감구진급상응련접시적전감。동시，심입연구료4개저압요조량량천련후혹동시공작혹단독공작시전감치수부재전류변화적특성，추천료직류제식하변압기용작려파전항기시기저압요조일충교합괄적련접방식，차저충련접방식적전감계산치득도료시험험증。문장최후환침대소추천적련접방식，재단회로공작시교쌍회로공작시소정현적전감치차이，제출료일충증설제삼요조적보상방안，병취유관문제진행료분석。
AC supply and DC supply coexist in electrified railway in some countries,such as South Af-rica.When a locomotive runs to a railway section powered by DC,its transformer is usually used as a filter reactor.In this paper,the electromagnetic characteristics of a locomotive transformer in DC system were studied with a geometry of"C-core" core-type and four high voltage windings and four low voltage wind-ings symmetrically arranged on two core limbs respectively.When a locomotive is powered by DC,the four high voltage windings of a transformer are connected in parallel and in open circuit,and the two low voltage windings on a limb are connected in series and used as the filter reactor.There are two DC powered circuits in a locotomotive and one of them can work alone or the two work together.In this paper,themagnetic field of the transformer was analyzed and the inductances were calculated,in which different con-nections of the four low voltage windings were considered.Moreover the characteristics of inductances with changes of the currents in the windings were studied,and the inductance computation was proved with tests for that in which a DC circuit works alone.Then,a proper connection of the low voltage wind-ings in DC system was proposed according to the above analysis.Finally,some investigation was done to increase the inductance when a DC circuit works alone and an improved design was presented.