城市轨道交通车站低压负荷需要系数研究

针对城市轨道交通车站变压器容量选择过大、负荷率低的问题,通过分析车站用电负荷计算过程,得知需要系数Kx与多种因素有关。基于武汉地铁秋季和夏季用电负荷实测数据,并结合设计手册中各设备需要系数的取值,通过研究螃蟹岬站实际用电情况,给出轨道交通不同类型用电设备的需要系数取值或范围。同时也提出,考虑到大功率风机的启动情况,地下车站变压器容量不宜小于800 k VA。该结果对于城市轨道交通车站负荷计算和变压器容量选择具有指导意义。

Demand Coefficient of Low-Voltage Load for Urban Rail Transit Station

The urban rail transit station often has the problems of high transformer capacity and low load rate.Through analyzing the process of load calculation,we make a conclusion that the demand coefficient Kx has relation with many factors.Based on the actual measured power load of Wuhan subway in autumn and in summer,we research the actual electricity load of Pangxiejia station and obtain the optimized value or range of demand coefficient for different types of electrical equipment in urban rail transit,referencing the rated value of demand coefficient in design regulations.Besides,considering the start situation of large-power wind turbine,the transformer capacity of the underground station should be larger than 800kVA.This result is of significance for the calculation of power load and selection of transformer capacity for urban rail transit station.