地铁35kV供电分区设置分析

Analysis of 35 kV Metro Power Supply Section Numbers

目前国内地铁35kV环网过流保护的时间级差按0.30s配置,无法保证过流保护的选择性。提出通过缩减过流级差配合时间的方案,来解决地铁35kV供电分区过流保护的选择性问题,同时分析了一个供电分区内变电所设置数量对投资的影响。在不改变主变电所过流时间配合的情况下,正线变电所过流时间级差配合为0.25s或0.20s,且一个供电分区内变电所设置数量不超过4座为宜。

The current 35 kV metro power supply section cannot solve the selective problem for overcurrent protec tion because the stage difference coordination is fixed at 0. 30s, a new method is proposed in this article that will re duce the time of stage difference coordination. At the same time, the influence over investment by the number of sub station allocated in one power supply section is analyzed. It is suggested that the stage difference coordination of the main substation overcurrent protection should be kept be tween O. 25 s and O. 20 s, the number of substation allocated in one power supply section should be limited to 4.