研究目的：带回流线的直接供电方式在我国200 km /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 TRNF power supply mode has been used widely for the railway line for mixed passenger and freight traffic with speed of 200km／h and below．With rapid increasing of the traffic volume，the power supply capacity for double—track electrified railway has already been designed to satisfy the condition the same type trains run in the minimum fleeting interval，SO the cyclical electric load in traction network happens．In this paper，the current carrying capacity of traction network for double—track under the different operation modes is analyzed and calculated on the base of the equivalent principle of the cyclical load in the traction network to seek the compositive law of the traction network load for providing the basis for improving the design efficiency．
Research conclusions: When the traction power network separately supplies the upward track and downward track of double—track electrified railway，the equivalent current of the feeding section for upward track(or downward track)is approximately equal to the product of the interval number and the average current of upward(or downward)train．When the traction power network parallel supplies the upward track and downward track，the equivalent current of the feeding section for upward track(or downward track)is approximately equal to the 3／4 equivalent current of the upward track (or downward track)when separately supplying and plus the 1／4 equivalent current of the downward track(or upward track)when supplying separately．The the current carrying capacity of feeding section cab be improved by adopting parallel supply．More improvement can be achieved with the increasing of the average current difference between upward track and downward track，and the current difference can be reduced by 1／4 under the condition of electric load of the track on single direction slope．The equivalent current of section post is related to the average current difference between trains running on upward track and downward track．The equivalent current of section post is the minimum when the current of upward train is equM to that of downward train．The equivalent current of section post is the maximum and approximately equal to the 1／4 equivalent current of train running on the track with power supply separately when there is no train on one track or the average current of train is equM to zero．
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