扩大内桥接线的备用电源自动投入的探讨

Discussion of Inter-bridge Connected Backup Power Automatic Bus Transfer Switch-in

随着电网负荷的飞速增长,有3台主变的110kV变电所将逐渐增多,采用扩大内桥接线的变电所也逐渐增多。扩大内桥接线存在多种运行方式,也存在多种备用电源自投方式(简称备自投)。备自投的启动条件是可以满足要求的,但是出口回路比较复杂,利用空跳、空合的方式可以找到一种通用的出口逻辑。备自投闭锁条件仅考虑主变保护动作。

As the load of power grids increasing rapidly, the number of 110 kV substations equipped with 3 main transformers and substations equipped with expanded inter - bridge connections will grow. There are several operating modes for expanded inter - bridge connections and backup power automatic switch - in bus transfer. The starting conditions for the automatic switch - in bus transfer can be satisfied, although the outlet circuit is complicated. Universal outlet logics can be developed using null switch - off and null switch - on. The lockingcondition for the backup power automatic switch - in only considers the main transformer protection.