高速铁路接触网不同导线组合的载流能力分析

Study on Ampacity of High-speed Railway Catenary with Different Conductor Combinations

高速铁路接触网的载流量计算不仅是接触网各导线选型的重要基础,也是影响牵引供电设计的关键环节。基于新标准TB/T 2809-2017《电气化铁路用铜及铜合金接触线》与TB/T 3111-2017《电气化铁路用铜及铜合金绞线》,研究导线正常工作以及考虑磨耗情况下的载流能力,计算不同导线组合的电流分配系数、综合载流量以及各导线的载流利用率。结合工程实例,给出接触网导线选型的基本方法,得出如下结论:(1)有多种接触网导线组合能满足本工程的载流量需求,牵引供电设计应分析不同导线组合载流能力,以确定最优的导线配置方案;(2)按照接触网系统设计寿命选择导线磨耗比会更加合理,接触网导线选型也更加灵活;(3)采用20 min最大有效电流和短时最大电流来校核接触网持续载流量较为合理。(4)从载流量角度出发,本工程接触网最高工作温度可选取为95℃。

The ampacity of high-speed railway catenary is not only an important basis for the selection of catenary conductors, but also a key part in the traction power supply design. Based on the new standard TB/T 2809-2017 Copper and Copper Alloy Contact Wire for Electric Railway and TB/T 3111-2017 Copper and Copper Alloy Stranded Conductors for Electric Railway, the ampacity of conductors in its normal operation and wear operation are analyzed. And the current distribution coefficient, the integrated ampacity and the ampacity utilization ratio of the conductors are also calculated. Finally, some references are given with specific engineering examples. Research conclusions:(1) Different conductor combinations should be analyzed to determine the optimal conductor configuration;(2) It would be more reasonable to select the wear ratio of the conductor according to the design life of the catenary system;(3) The maximum effective current in 20 minutes and the maximum current in short time would be more reasonable to be employed to check the sustained carrying capacity of the catenary;(4)The highest working temperature of the catenary in this project can be chosen as 95 ℃ so far as the carrying capacity is concerned.