Application of overload cutting of automatic standby power switch devices

Conventional automatic standby power device does not take into account overload-cutting at lines standby switch way and the overload discriminant on mid-low side of three-volume transformer,so it could only realize overload-cutting at bus tie circuit breaker standby switch way. On the basis of the existing hardware, by modifying the software logic and making the hardware necessary changes, the overload-cutting functions under each automatic standly switch way are realized, and the implementation method is given by using PSP642.