Low-current fault positioning method based on fault characteristic value

The invention discloses a low-current fault positioning method based on a fault characteristic value. The method comprises the steps that: S10, line terminals in a power distribution network periodically collect three-phase and zero-mode voltage signals, and detect whether a line has a single-phase grounding fault or not; S11, the line terminals obtain fault waveforms, and fault characteristic values corresponding to the line terminals are calculated; S12, the line terminals uniformly upload the fault characteristic values carrying address information and time labels to a main control terminal; and S13, the main control terminal positions a line fault according to all the fault characteristic values, a topology identification matrix corresponding to the lines and a predetermined fault unified judgment strategy. By implementing the invention, the fault positioning process and the data transmission quantity between the terminals can be simplified, and the positioning efficiency is improved. 本发明公开了一种基于故障特征值的小电流故