Configuration method, system and device of monitoring device

The invention discloses a configuration method, system and device of a monitoring device, which are applied to the field of power distribution network configuration, and comprises the following steps: determining a fault voltage monitored by each monitoring point when one node in a power distribution network is used as a fault occurrence point and other nodes in the power distribution network are used as fault monitoring points; determining an observable index of the voltage sag according to whether each fault voltage and the fault occurrence point are provided with a monitoring device or not; determining an observable index of the fault position; and determining the configuration positions of the monitoring devices by taking the maximum value of the observable index of the voltage sag, the maximum value of the observable index of the fault position and the minimum value of the number of the monitoring devices as target functions. When the observable index of the voltage sag and the observable index of the fa