二次反送电的分析及改进建议

Analysis and Improvement Measures of the Secondary Reversed Feeding

双母线接线方式运行灵活,母线轮换检修时不中断对用户的供电,但是倒闸操作较复杂,在操作过程中易发生带电的电压互感器(TV)二次回路与不带电的TV二次回路相并列,其后果是使带电的TV二次回路空气开关跳开,使所有运行母线上开关保护交流二次回路电压失去。文中从一起线路冲击过程中因其他间隔的刀闸辅助接点没有返回引起二次反充电,对此提出了一些改进和预警的建议。

The duplicate-busbar operation is flexible and power supply to users doesn＇t have to be interrupted during rotation bus maintenance.But the switch operation is so complex that the secondary circuit of voltage transformer（TV） under power and the secondary circuit of TV without power are easily in parallel during the operation.The consequence is to make the secondary circuit air switch of charged voltage transformer tripped,thus secondary circuits of switch protection of all the running buses will lose power.In this paper,a secondary reversed feeding event because that the auxiliary contacts of other interval switch fail to return during the line impact.And some improvements and warnings are also proposed.