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The traditional fault indicator can only record and collect the information on the spot, and can not effectively analyze and judge the fault, the delay of the fault analysis and judgment is large, and the accuracy of fault diagnosis is low. This paper introduced the cycle filtering method to eliminate power signals on the effects of sampling, using differential symbol statistics and maximum statistical method, to obtain the small current grounding system transient pure waveform and the peak peak value, the fault judgment strategy based on clustering analysis, timely and accurate judgment for the distribution network fault, fault reporting control integrated processing center and improve the reliability of power grid operation, and implementation of field information acquisition fault indicator analysis.