Fault indicator of distribution network

The utility model discloses a fault indicator of a distribution network. The fault indicator comprises a Rogowski coil, a peak value maintaining module, a measuring coil, a master controller module, an RF (Radio Frequency) output module, a power taking coil, a power supply module and a battery module, wherein the output end of the Rogowski coil is connected with the master controller module via the peak value maintaining module, high-frequency current signals output by the Rogowski coil are processed by the peak value maintaining circuit and then transmitted to the master controller module, the measuring coil is connected with the master controller module, the power taking coil is connected with the power supply module, the power supply module is connected with the master control module and supplies power for the master control module after rectifying voltage reduction, the power supply module is also connected with the battery module, and the battery module is connected with the master control module and supplies power for the master control module via a battery management chip. The fault indicator of the distribution network can effectively measure the peak value and direction of an instant transient current in a single-phase earth fault, and locate the fault according to the peak value and direction of the transient current.