影响地回流因素及其抑制方法分析

Analysis of Factors Affecting the Distribution of Ground Return Flow and Its Suppression Method

为了有效减小地回流以降低其对牵引变电所的影响,建立了铁路牵引供电系统仿真模型,并基于此模型对影响地回流与轨回流比重的因素进行了分析。结果表明:地/轨回流比值随着机车与牵引变电站距离的增大而增大,随着牵引变电所接地电阻的减小而减小,随着道床电阻率的增大而减小。基于此,设计了2种减小地回流的方法,第一种方法为在距离牵引变电所最近的吸上线处对钢轨进行接地,其结果表明,当接地电阻为0.88Ω时,相对于不进行接地时地回流减小了58 A,降低地回流效率达到了25.3%;第二种方法为分别在0~1000 m、-1000~1000 m、0~2000 m处在钢轨两侧添加贯通地线,其结果表明在0~2000 m处添加效果最优。

In order to effectively reduce the ground return flow and its impact on the traction substation,a simulation model of the railway traction power supply system is established.Based on this model,the factors affecting the proportion of ground return flow and rail return flow are analyzed.The results show that the ground/rail return ratio increases as the distance between the locomotive and the traction substation increases,decreases as the ground resistance of the traction substation decreases,and decreases as the resistivity of the track bed increases.Based on this,two methods to reduce ground return are designed.The first method is to ground the rail at the suction line closest to the traction substation.The results show that when the ground resistance is 0.88Ω,it is When grounding,the ground return has been reduced by 58 A,and the efficiency of ground return has been reduced by 25.3%;the second method is to add through ground wires on both sides of the rail at 0~1000 m,1000~1000 m,and 0~2000 m respectively.As a result,it shows that the effect of adding at 0~2000m is the best.