直流牵引回流系统钢轨电位的理论分析

通过建立直流牵引回流钢轨电位的等效模型,分析其基本特征及影响因素,某一点的钢轨电位呈现明显的交变特性。合理设置直流牵引供电系统网络参数和优化列车运行图以调整列车电流的时空分布,是控制钢轨电位的有效措施。结合现行规范分析钢轨电位设计标准在执行中的困惑,提出钢轨电位的评价应以确保电压作用人体安全为基本出发点,体现电压幅值及其时间持续效应,不应仅规定峰值电压。

Theoretical Analysis of the Rail Potential of the Current return Circuit in the Direct-Current Traction System

n order to analyze the basic characteristic and its influence factors of the rail potential of the Direct-Current Traction Power Supply System, the mathematical model of the rail potential is established and analyzed. The rail potential of a certain point presents obvious alternating characteristics. A reasonable set of traction power supply system network parameters and the optimal train current temporal-spatial distribution by adjusting the run chart of the trains are the effective measures to control the rail potential. The evaluation of rail potential should reflect the voltage amplitude and its time duration, which was based on the insurance of the human voltage security.