城市轨道交通降压变电所供电能力研究

Research on the Power Supply Capability of Step-down Substation in Urban Rail Transit

大部分城市轨道交通在开通试运营前会进行消防联动试验。试验过程中,经常发生整个降压变电所退出运行的情况,此时无应急电源的消防设备将全部停止工作。分析了降压变电所的下级负荷特性以及继电保护设置,并搭建测试模型分析发生上述情况的原因。通过实际案例分析,提出解决建议,以确保城市轨道交通降压变电所的供电能力满足标准要求。

Most urban rail transit companies will start the joint fire test before trial operation,but during the test,more often than not the power supply failures of the step-down substation would happen,resulting in fire equipment stop if not equipped with emergency power supply.In this paper,the lower load characteristics and relay protection settings of the step-down substation are analyzed,the power supply failure is simulated by establishing a test model.Through case studies,practical solutions are proposed to ensure the power supply ability of step-down substations in urban rail transit.