铁路建设临时电力线、集中发电费用 ,在大型临时设施费用中占较大比重。为提高工程经济专业设计文件质量 ,此文根据现行规定 ,从定量的角度出发 ,提出了通过计算供电线路临界长度进行经济比较 ,确定施工供电方式 The temporary power lines for railway construction and centralized power generation costs account for a large proportion of the expenses for large-scale temporary facilities. In order to improve the quality of engineering design documents, according to the current regulations, from the quantitative point of view, this paper proposes to compare the critical lengths of power supply lines to determine the construction of power supply