随着经济建设飞速的发展,城市规模不断扩大,为了解决城市交通的供需矛盾,近年来我国大力发展城市轨道交通建设,在大城市中形成了复杂的城市轨道交通网络。大量的案例表明,地铁中存在的杂散电流会对地表电位分布产生影响,而如果周边存在电力变压器时,变压器中流过的直流电流会造成变压器发生直流偏磁,然而,目前关于地铁地表电位分布对周边变压器直流偏磁影响研究较少,为此,本文考虑了列车上下行4种不同运行状况,搭建地铁地表电位仿真模型,并计算了相应情况下变压器励磁电流畸变率,得出了上下行列车同时出站时,对变压器直流偏磁影响最严重的结论,为预防电力变压器发生直流偏磁提供理论依据。

With the rapid development of economic construction and the continuous expansion of urban scale, in order to solve the contradiction between the supply and demand of urban transportation, my country has vigorously developed urban rail transit construction in recent years, forming a complex urban rail transit network in large cities. A large number of cases have shown that the stray current in the subway will affect the surface potential distribution, and if there is a power transformer nearby, the DC current flowing through the transformer will cause the transformer to be DC biased. However, the current situation regarding the subway surface potential distribution There are few researches on the influence of DC bias of surrounding transformers. For this reason, this paper considers four different operating conditions of train up and down, builds a subway surface potential simulation model, and calculates the transformer excitation current distortion rate under corresponding conditions, and obtains the up and down When the trains leave the station at the same time, the conclusion that has the most serious impact on the DC bias of the transformer provides a theoretical basis for preventing the DC bias of the power transformer.

TP391.9