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研究目的:带回流线的直接供电方式在我国200km/h及以下客货共线铁路中广泛采用。随着运量的快速增长,复线电气化铁路的牵引供电能力已按满足同型列车以最小追踪间隔时分连续追踪运行进行设计,从而使牵引网电气负荷呈现出周期性。本文从周期性负荷的等效原理出发,对复线牵引网各种运行方式下的载流能力进行分析与计算,求得牵引网负荷合成的内在规律,为提高设计效率提供依据。研究结论:复线直供牵引网上下行分开供电时,供电臂上行(或下行)等效电流近似等于追踪间隔数与上行(或下行)列车平均电流的乘积;并联供电时供电臂上行(或下行)等效电流近似等于分开供电上行(或下行)等效电流的3/4加上分开供电下行(或上行)等效电流的1/4;上下行并联供电对供电臂载流能力的改善程度,随上下行电流的差距的增加而增加,最大改善程度为单面坡负荷条件下降低1/4;分区所等效电流主要与上下行列车电流的差距有关,当上下行列车电流大小相等时,分区所等效电流最小,当有一个行车方向无车或列车电流为零时,分区所等效电流最大并近似等于有车方向分开供电等效电流的1/4。
Research purposes: The direct power supply with return flow line is widely used in China’s 200km / h and below passenger-freight lines. With the rapid growth of traffic volume, the traction power supply capacity of the double-track electrified railway has been designed to meet the continuous tracing operation of the same type trains with the minimum tracing interval time interval, so that the electrical load of the traction grid shows a periodicity. In this paper, starting from the equivalent principle of periodic load, this paper analyzes and calculates the current-carrying capacity under various operating modes of the double-track traction network and obtains the inherent law of load synthesis of the traction network to provide the basis for improving the design efficiency. Research conclusions: When the double-wire direct-supply traction grid is separately powered, the upstream (or downstream) equivalent current of the power supply arm is approximately equal to the product of the number of tracking intervals and the average current of the upstream (or downstream) train; ) Equivalent current is approximately equal to 3/4 of the equivalent upstream (or downstream) equivalent current of the separately powered plus 1/4 of the equivalent downstream (or upstream) equivalent current of the separately powered supply; the degree of improvement of the current carrying capacity of the power supply arm , With the current up and down the gap increases, the maximum degree of improvement is reduced by 1/4 under single-slope load conditions; partition equivalent current mainly with the up and down the train current gap, when the uplink and downlink train current equal size , The division of the equivalent current minimum, when there is a direction of traffic-free car or train current is zero, the division of the equivalent current maximum and approximately equal to the direction of the car separate supply equivalent current 1/4.