Research On Optimization Of Neutral Grounding Mode Of 10kV System In Xuzhou Distribution Network

During the operation of distribution network,the operation mode of neutral point determines the insulation mode,power supply reliability,equipment protection setting and so on.In a neutral ungrounded mode,the distribution network is allowed to continue to operate for two hours in case of single-phase grounding.However,with the development of power system reliability,the neutral grounding mode of distribution network needs to be adjusted accordingly.In recent years,more and more neutral grounding through low resistance has been adopted by distribution networks.Firstly this paper introduces the research background and current development of neutral grounding,then theoretically compares and analyzes the advantages and disadvantages of various neutral grounding modes and the differences when single-phase short-circuit fault occurs.Then combined with the actual situation of the neutral grounding mode in Xuzhou distribution network,the optimal design scheme of Xuzhou neutral grounding mode is put forward.Finally,the simulation model of neutral grounding through low resistance based on MATLAB and the actual transformation in Xuzhou are used to analyze the neutral grounding mode in Xuzhou area and the problems needing attention.