Method of for positioning fault sections of distribution network lines on basis of wide-area differential deviation

The invention discloses a method of for positioning fault sections of distribution network lines on basis of wide-area differential deviation. According to the method, for a ground fault, phase current characteristics of fault phase current before the occurrence of the fault and during a period of from the occurrence of the fault to acting time of an arc suppression coil are analyzed so as to extract fault characteristic quantities, and positioning is performed by means of waveform wide-area differential deviation during the whole course. only the fault phase current of a line needs to be measured, the scheme is simple, adaptability is high, the problems that the existing general low-current ground system has weak fault current, poor reliability and low sensitivity in case of ground fault is well solved, and no interference is caused to a system.