AT供电方式下高铁站台空间电场分布研究

Research on Spatial Electric Field Distribution of High-Speed Railway Station under AT Power Supply Mode

为分析高速铁路站台接触网周围空间电场的影响,建立站台接触网与列车及建筑物的等效模型,通过模拟电荷法计算并分析AT供电方式站台区域工频电场的分布规律,运用MATLAB绘制出不同高度及有无建筑、有无列车等多种情况的电场强度变化曲线。分析得出垂直方向上距地面高度越高,场强越大;水平方向上以接触线为中心向远处衰减。列车对站台上场强屏蔽效果显著,在白色安全线处达到了86%;而建筑由于距离较远对电场屏蔽效果仅为6%,站台上电场强度的极大值出现在人体头部区域,无建筑无列车停靠时场强在头部已经接近5000V/m,所以旅客在无列车停靠时也尽可能站在白色安全线外候车。

In order to analyze the influence of the electric field in the space around the catenary of the high-speed railway platform, an equivalent model of the catenary of the station, the train and the building were established, and the distribution law of the power frequency electric field in the platform area of the AT power supply mode was calculated and analyzed by the simulated charge method. MATLAB was used to plot the electric field intensity change curves of different heights, with or without buildings, with or without trains, etc. The analysis shows that the higher the height from the ground in the vertical direction, the larger the field strength;the horizontal direction is attenuated toward the distance with the contact line as the center. The effect of the train on the platform of the field strength shielding is significant, reaching 86% at the white safety line;and the building’s shielding effect on the electric field is only 6% due to the long distance. The maximum value of the electric field strength on the platform appears in the human head area. When there is no building or train stop, the field strength is already close to 5000 V/m on the head. Therefore, when there are no trains, passengers should stand outside the white safety line as much as possible.