Auxiliary decision-making device and fault alarm method and system in low-voltage distribution network line

The invention discloses an auxiliary decision-making device, a fault alarm method and a fault alarm system in a low-voltage distribution network line. The device comprises a distribution network EMS system, a main network EMS system, a data acquisition module, a monitoring alarm module, an auxiliary decision-making module and a deployment display module. The distribution network EMS system and the main network EMS system are respectively connected with the data acquisition module, and the data acquisition module, the monitoring alarm module, the auxiliary decision making module and the deployment display module are connected in sequence; and the monitoring alarm module comprises a beforehand early warning module, an in-event alarm module and an evaluation analysis module. According to the invention, the real-time operation state of the distribution network is analyzed through the auxiliary decision-making device; according to an analysis result, corresponding warnings and decisions are generated, and visual i