10kv配电网小电阻接地系统单相短路故障与其保护的的研究

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1、lOkV配电网小电阻接地系统单相短路故障及其保护研究AbstractNeutralgroundingwithoutimpedance,neutralgroundingthroughsuppressioncoilandneutralgroundingthroughlowresistorarethemostcommonneutralgroundinginthe10kVdistributionnetwork．Therealedifferentcharacteristicsandapplicationadvantages谢也differentneutralgrounding．Wi

2、ththedevelopmentofdistributionnetworkstructureandcapacity,lowresistancegroundingsystemhasgraduallybecomeabetterchoice．Tllispaperdescribestheprinciplesofthreemaingroundingsystemandmeircharacteristics．focusonthesingle-phasefaultsteady-stateandtransientshort-circuitcurrentofthelowresistanceg

3、roundingsystem，thedistributionofZero—sequencecapacitivecurrentandthedistributionofthestepvoltage．Italsomadeasingje-phasefaultsimulationanalysisinlowresistancegroundingsystemwithdifferenttransitionresistance．Theexperimentofsingle-phasefaultinlowresistancegroundingsystemisdesignedandmade，an

4、dthestepvoltagedistributiondataneartheshort-circuitfaultaregotten．Thezero-sequencecurrentprotectionaboutlowresistancegroundingsystemisstudy．Thestudyofthispaperfocusesonthefollowingaspects：ThedevelopmentandapplicationtrendsofneutralgroundinginlOkVdistributenetworkareintroducedinthisthesis，

5、111eoverviewofthedistributionnetworkshort-circuitfaultandprotectionarcalsotalkedinthepaper．Thesteady-stateandtransientequivalentcircuitoflowresistancegroundingsystemwhensingle-phasegroundfaultoccurareproposedthroughcarefulanalysis，111esteady-stateandtransientshort—circuitgroundcurrentarec

6、alculatedindetails．TheZerO—sequencecapacitivecurrentdistributionandcharacteristicsaregiven．111estepvoltageandgroundingresistanceayeelaborated．MATLABsoftwareanditsapplicationinpowersystemsimulationaredescribed．111esimulationmodeloflOkVdistributionnetwork、)l，i也lowresistancegroundingwhenthes

7、ingle—phasefaultOCCURSisestablished．111eshort-circuitgroundcurrent,lowresistancecurrent，theZerO-sequencevoltageandthree-phasevoltagesimulationwaveformsaregottenthroughsimulationwhiletheshort-circuittransitionresistancearedifferent．111edatesareclosetothetheoreticalca