Phase current-based power distribution network fault judgment method

The invention discloses a phase current-based power distribution network fault judgment method, which overcomes the problem that various fault types cannot be judged in the prior art, and comprises the following steps of: acquiring and monitoring information of controlled equipment; isolating and converting the information of the controlled equipment into weak signals through a high-precision small CT; sending the weak signals to a DSP processing module through an analog-to-digital converter, and carrying out calculation processing; carrying out fault detection according to the collected current magnitude; and enabling a DTU to report the fault information and property to a master station or a substation. According to the invention, the fault type can be accurately judged according to the processed signal data; when a fault occurs, the corresponding fault lamp can be lightened and information can be reported to the master station or the substation; and power distribution operation can be remotely controlled.