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10kV配网中性点小电阻接地技术及应用分析.docx

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10kV配网中性点小电阻接地技术及应用分析 Abstract Withthedevelopmentofpowersystemtechnology,theneutralgroundingtechnologyhasbecomeanimportantmeanstoimprovethereliabilityandsafetyofpowersupply.Thispaperintroducesthesmallresistancegroundingtechnologyoftheneutralpointinthe10kVdistributionnetwork,includingitsprincipleandapplicationanalysis.Thesmallresistancegroundingtechnologyoftheneutralpointcansolvetheproblemoflowvoltagegrounding,whichiswidelyusedinthe10kVdistributionnetwork. Introduction WiththerapiddevelopmentofChina'seconomyandthecontinuousincreaseofpeople'slivingstandards,thepowerdemandisalsoincreasing.The10kVdistributionnetworkisthemainpowersupplynetworkforurbanandruralareas.Asthedistributionnetworkexpands,thecomplexityofthedistributionnetworkincreases,makingitmoredifficulttosafeguardthepowersupply.Therefore,itisnecessarytoimprovethereliabilityandsafetyofpowersupply,whilereducingtherisksofpowersystemfaults.Theneutralgroundingtechnologyisaneffectivemethodtosolvetheseproblems. Thesmallresistancegroundingtechnologyoftheneutralpointinthe10kVdistributionnetworkismainlyappliedtosolvetheproblemoflowvoltagegrounding.Thispaperaimstointroducetheprincipleandapplicationanalysisofthesmallresistancegroundingtechnologyoftheneutralpointinthe10kVdistributionnetwork. PrincipleofSmallResistanceGroundingTechnologyofNeutralPoint Thesmallresistancegroundingtechnologyoftheneutralpointisagroundingmethodinwhichasmallresistorisconnectedinseriesbetweentheneutralpointandthegroundedpoint.Whenasingle-phasegroundfaultoccurs,thefaultcurrentpassesthroughtheresistor,andthevoltagegeneratedacrosstheresistorlimitsthefaultcurrent.Inthisway,thefaultcurrentislimitedtoasaferange,avoidingthedamagecausedbyhigh-currentfaultsinthecaseoflowvoltagegrounding. Thegroundingresistanceoftheneutralpointissmall,andthefaultcurrentgeneratedbythesingle-phasegroundfaultislarge.Thesmallresistancegroundingtechnologyensuresthatthegroundfaultcurrentislimitedtoasafevalue,avoidingthedangerofelectricshocktopersonnelandreducingtheriskoffire.Inadd