Transient Processes at Single Phase-to-ground Faults in Combined Grounded Networks

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1、1TransientProcessesatSinglePhase-to-groundFaultsinCombinedGroundedNetworksA.Yu.Vasilyeva,A.I.Shirkovets,A.V.Telegin,L.I.Sarin,M.V.IlinykhinggroundfaultsleadstoreducingofthenumberofinsulationAbstract--Thispaperdealswiththecombinedmethodofneu-flashoversandthetotal

2、numberoffaults.Almostfullreduc-tralgroundingwhenahigh-valueresistoriscontinuouslycon-tionoftransitionsofarcinggroundfaultstodouble-phasenectedtoaneutralinparallelwithaPetersencoil.Monitoringoffaults(i.e.shortcircuits)isobserved.Since1998,thecom-processesatsingle

3、phase-to-groundfaultswasorganizedinthe6binedmethodofneutralgroundingissuccessfullyusedinvar-kVnetworkofthelarge-scaleironandsteelplant.Withintheinvestigation,morethan200oscillogramsofphase-to-groundiousnetworksinRussia(morethan400powerfacilities),in-voltageswere

4、analyzed.Basedonrecordedoscillograms,thecludingnetworksofironandsteelplants,distributionsubsta-comparisonbetweenprocessesatgroundfaultsintheresonanttions,andlargeCHP(CombinedHeatandPower)networksgroundednetwork(groundingthroughaPetersencoil)andinthe[2].combinedg

5、roundednetwork(groundingthroughahigh-valuePositivefieldexperienceofthismethodofneutralgroun-resistorinparallelwithaPetersencoil)wasdone.Numericaldingcanbeevaluatedthroughthemonitoringoftransientvaluesofdangerousfornetworkinsulationtransientprocesses,frequencydis

6、tributionsofovervoltagelevels,andarcdurationsprocessesatsinglephase-to-groundfaultsrecordedbyspecialwereobtainedbymethodsofstatisticalprocessing.Fieldexpe-equipment.Themonitoringsysteminstalledinthe6kVnet-rienceofcombinedgroundednetworksshowsthatcontinuouslywork

7、ofNovokuznetskIronandSteelPlantallowscollectingoperatedneutralgroundingresistorsreducetheamountofemer-statisticsonsinglephase-to-groundfaultsandanalyzingcom-gencyoutagescausedbygroundfaults4-6timesanddecreaseparativelytransientprocessesintheelectricalnetworkwhic

8、hundersupplyofenergytocustomers;maximumovervoltagele-wasoperatedwithdifferentmethodsofneutralgrounding.vels,arcduration,insulationbreakdownsandmultiplacefaultsalsodec