改进型的扩大内桥备自投装置的应用

首先进行了110kV扩大内桥备自投的动作需求分析；其次给出了110kV扩大内桥接线备自投的逻辑实现配置；最后，在考虑了现场应用过程中主变保护闭锁备自投逻辑的利弊关系后，提出了一种较好的解决方案。在贵阳某110kV变电站的整组试验和运行情况表明，该装置能完全适应扩大内桥接线不同运行方式下不同的逻辑需求，具有较高的工程实用价值。

Application of improved back- up switching equipment in enlarging internal bridge main connection

First of all, the paper takes an operation demand analysis of 110 kV back - up switching equipment in enlarging bridge main connection; then introduces the logical implementation configuration of 110 kV back -up switching equipment in enlarging bridge main connection; At last, it presents a solution of configuration of 110 kV enlarging internal bridge back -up switching equipment after analyzing main modes in 110 kV enlarging internal bridge main connection, and discusses the logic conditions by considering its cooperation with main transformer protection. The overall experiments and test operation results in a 110 kV substation in Guiyang indicate that the device can satisfy different control logics of different operating modes with enlarging inner bridge, and also are practical engineering value.