城市轨道交通中压配电系统若干问题

Some Technical Problems of MV Power Distribution System in Municipal Rail Transit System

针对国内城市轨道交通中压配电系统的设备参数选型、继电保护配置与整定计算等存在的一些问题做简要分析。其中对中压电网中性点接地方式有关的问题、小容量变压器的保护配置与电流互感器参数选择、环网越区供电模式下时限级差配合问题等内容做了重点阐述，并给出相关建议以期抛砖引玉。

The article analyzes some problems regarding equipment technical parameters selections, configuration and calculation of protective relaying of the MV power system in municipal rail transit system. The discussion focuses in the problems rising from the neutral grounding methods of MV system, protection configuration for transform with low capacity, technical parameters selection of current transformer and time coordination of protection during special operation mode. Herein, solutions for the problems are also proposed accordingly.