适应无母线TV内桥接线的备自投逻辑改进

为提高线路保护装置动作的高可靠性,通过对无母线TV的内桥接线方案及二次电压切换回路进行分析,指出这种典型设计方案在实际工程应用中存在保护装置和备用自动投入（备自投）装置误动或拒动,以及对备自投装置造成压板投退复杂等问题.结合一个工程案例探讨备自投逻辑改进方案,为内桥式变电站的设计提供参考.改进效果良好,基本解决了备自投装置误动问题.

Logic Modification of Bus Transfer Equipment for Internal Bridge Connection without Bus TV

In order to improve the reliability of line protection, the internal bridge connection without bus TV and the secondary voltage switching circuit are analyzed. It is point out that the typical design scheme has problems such as the unwanted operation or failure to operation of the line protection equipment and the bus transfer equipment, the complicated plate commissioning and ceasing of bus transfer equipment and so on. A logic modification scheme for the bus transfer equipment is discussed based on a actual project case,which can provide reference for the design of internal bridge type substation. The modification has better effectiveness, which solves the unwanted operation problem of bus transfer equipment.