Abstract
After the multi-distributed generation is incorporated into the distribution network with small resistance grounding at the neutral point, the system structure of the distribution network will change, and the reliability of the original single-phase grounding protection will be greatly affected. Based on the typical structure of small resistance grounding distribution network with multi-distributed generation, this paper analyzes the fault characteristics of zero sequence current at both ends of the protected area section when single-phase grounding fault occurs, and proposes a longitudinal protection scheme based on the phase relationship of zero sequence current according to the fault characteristics. The protection scheme effectively solves the problem of misoperation of single-phase grounding protection in traditional small resistance grounding distribution network after multi-distributed generation is connected to the grid.
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