500kV静安(世博)地下变电站站用配电系统及辅助系统设计

在500 kV 世博站全站安装3 台(二用一备)正常站用变压器, 变压器的容量选择5 000 kVA, 工作/备用站用变采用分裂绕组变压器。站用电400 V 系统接线分为2 部分, 每部分采用单母线分段接线, 分段开关为自动投切型。从站外引1 路10 kV 专用线路作为全站失电后的恢复电源。地下变的照明系统的设计标准较高, 闭路监控系统采用全数字式, 电缆梯架和阻燃电缆的配合使用满足地下变对低压电缆敷设的要求, 弱电部分采用防火型封闭式金属电缆槽盒。

Design of Auxiliary Distribution System and Its Auxiliary Systems for the 500 kV World-Expo Underground Substation

Three auxiliary transformations,two working and one backup,with 5 000 kVA capacity each and split winding are installed in the 500 kV World-Expo Substation.The connection of the 400V auxiliary power system is divided into two parts and each part adopts single bus-bar connection with automatic section switches.A 10 kV dedicated line from outside the station is introduced as recovery power supply in case of a power loss in the station.Higher design standard is applied to underground lighting system.All digital closed-circuit monitoring system is used.Combined usage of cable ladder and fire retardant cable meets low voltage cable laying requirement for underground transformer.Closed fire-proof metal cable boxes are used in secondary circuits.