求翻译：本文在介绍了地铁牵引供电系统的基础上，首先根据直流牵引变电所主接线以及二十四相整流机组外特性，分析直流供电系统的结构和功能，给出直流牵引网短路故障电流的计算方法。是什么意思？

On the basis of a subway traction power supply system, the first external characteristics of the main terminal of the DC traction substation, as well as the 24-phase rectifier unit, analyze the structure and function of the DC power supply system, given the short circuit fault current of the DC trac

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This article in introduced in the subway hauling power supply system foundation, first tows the transformer substation host wiring as well as 20 four-phase rectifier unit external characteristic according to the cocurrent, the analysis cocurrent power supply system structure and the function, gives

Metro traction power supply system in this article on the basis of, first under DC traction substations outside the main terminal and 24-phase rectifier unit characteristics, structure and function analysis of DC power supply system, for DC traction power network short-circuit fault current calculat

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