特高压变电站站用电系统设计探讨

针对荆门1000kV变电站一次接线特点,站用电系统采用2级降压方式,通过110/10kV、10/0.4kV2级变压器串联,中间经电缆引接且不设任何开断设备。对站用变回路电流互感器参数选择、站用变保护范围及其配置、备用电源投入等方面的设计进行分析,一期1号主变、0号备用变配设纵联差动保护、高压侧电流速断保护以及后备过流保护和低压侧零序电流保护、非电量保护,0号变110kV侧还装设了零序电流保护。由于2级串联变压器之间不设开断设备,电量保护动作时不区分故障元件。

Discussion on UHV Substation Auxiliary Power System Design

Because of the characters of primary connection of Jingmen 1 000 kV Substation,two-stage voltage step-down approach,which connects 110/10 kV and 10/0.4 kV transformers in series through cables without any switching devices,is used.Through analyzing current transformer parameter selection for auxiliary transformer circuit,protection range and configuration of auxiliary transformer,and backup power in,etc.,the No.1 main transformer and No.0 backup transformer are equipped with series connected differential pr...