Quick power supply restoration method after failure of special line and system

The invention discloses a quick power supply restoration method after failure of a special line and system. The method comprises steps: two ends, located at a substrate, of a special line and a conventional line are provided with line protection devices, wherein the line protection device comprises a CPU plug-in, and the CPU plug-in is used for transmitting a closing command to the conventional line from the special line. Through arranging the line protection devices on the special line and the conventional line, the closing command detected on the special line is transmitted to the conventional line, a closing relay is further controlled to close a switch to realize power supply restoration. The method is quick in speed, the problems of low efficiency and inconvenient operation brought bymanual closing can be avoided, three types of CPU plug-ins are provided to meet quick power supply restoration after failure of the special line in different application scenes, and the operation ofquick power supply restora