Design of Intelligent Positioning Method for Single-Phase Grounding Fault Interval in Intelligent Distribution Network
Faced with the problem of inaccurate interval positioning results due to the continuous increase in impedance modulus value,an intelligent single-phase grounding fault interval positioning method for intelligent distribution networks has been designed.Based on the characteristics of impedance modulus changes,construct an impedance modulus interval database,simulate the same type of fault situation in adjacent nodes,and divide the single-phase grounding fault interval of the intelligent distribution network.Calculate the increment of three-phase current when a fault occurs,obtain the total current of the fault interval,use differential filtering method to calculate the zero sequence current,and achieve intelligent positioning of the grounding fault interval by judging the relationship between the zero sequence current and the set starting threshold.The results show that the zero sequence current waveform analyzed by this method is consistent with the actual waveform changes after the fault,and the positioning time is the shortest(9 min),with accurate positioning effect.
intelligent distribution networksingle-phase grounding faultinterval intelligent positioningimpedance modulus value
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