城市轨道交通中压环网供电系统母线保护配置方案的比较分析

对城市轨道交通中压环网供电系统各种母线电流保护方案进行了分析。相对适用于小分区供电下的过电流级差配合母线电流保护方案以及大分区下闭锁型、电弧异常母线电流保护的方案,设置专用的母线差动保护装置作为母线主保护虽然投资略有增加,但利用专用的母线差动保护装置及后备过流保护装置建立了主备的母线电流保护方案,提高了城市轨道交通中压环网供电系统母线故障保护的可靠性。

Comparative Analysis of Bus Protection Schemes for Medium Voltage Ring Network Power Supply System in Urban Rail Transit

Various bus current protection schemes for the medium voltage power supply system in urban rail transit are analyzed.Compared with the over-current differential coordination bus current protection scheme in small partition power supply,the closed type and arc abnormal bus current protection schemes in big partition connection,a special bus differential protection device is set up as the parent.Though the cost of main line protection increases slightly,the establishment of the main bus current protection scheme will improve the reliability of the bus fault protection for urban rail transit network power supply system,by adopting the special bus differential protection device and the backup overflow protection device.