A “Zero Power Outage” decentralized self-healing system consists of atmospheric sealed air-insulated RMU and smart distributed power distribution terminal. The system adopts optical-fiber differential protection, busbar fiber differential protection and automatic spare power switching technology. The solution will adopt different troubleshooting methods according to the fault location. It can be used to quickly locate and shoot the trouble occurring in the main circuit of power distribution network, restore the power supply in non-fault area in milliseconds, and report the troubleshooting process and result to operators of power stations. The system substantially reduces the power outage duration and the affected area.