电气化铁路接触网载流量计算方法

Calculation Method of OCS Ampacity for Electric Railway

接触网载流量是电气化铁路的基础设计参数。传统方法计算接触网载流量时,只考虑接触网各导线自阻抗和导线间互阻抗对电流分配系数的影响。本文基于牵引网多导体传输线数学模型,给出了考虑回流电路影响时的接触网载流量计算方法,结合带回流线的直接供电方式牵引网和AT牵引网实例,对接触网载流量及各导线的载流利用率进行了计算。结果表明,当牵引网中存在距离接触网较近的回流导体时,传统方法计算出的导线电流分配系数存在明显误差。

The ampacity of an overhead contact system （OCS） is a basic designing parameter for electric rail- ways. When the OCS ampacity is calculated with the traditional method, only the influences of the self imped- ances of OCS conductors and mutual impedances between the OCS conductors on current distribution coeffi- cients are considered. Based on the mathematical model of the multi-conductor transmission line for traction network, a new method of calculating the OCS ampacity that takes the influences of return circuits into account was proposed. The OCS ampacity and the ampacity utilization ratio of the conductors were calculated for a direct feeding traction network with return cable and an AT feeding traction network. The results revealed that significant errors existed in the current distribution coefficients derived from the traditional method when there were return conductors close to the OCS in the traction network.