变电站接地网转移电位变化规律与其影响因素的分析

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1、西南交通大学硕士研究生学位论文第1II页AbstractGroundingtec_hn0109yhasprof．oundinnuenceonthesafeandreliableoperationofpowersystem．W池theexpallsionofgeneratorcapacity，mepromotionofHVDC仃ansmissionsystem，the伊owinggroundingcurrent，mesedeVelopmentshaVeproVidetherelia：bilitMsaf．etyandef

2、-feciencyofsubstationoperationwithmorechangUenges．Inpracticalprojects，、vhensubstationis10catedongralliteorotherareaswherethesoilareahi曲resistiVityaJldshortcircuitcurrentismuchtoo1arge，it-ssodi伍culta11deXpensivetoestablishahugegroundingdeVicewhichhaslowresistiVi

3、ty．Therefore，intheconditionof1argesubstationc印acityandhi曲soilresistiVity，it’simpossibletomake伊oundingresistance10w．Whenshort—circuitfaulthappensinthesubstation，thepotentialinthesubstationoraroundwilldseconsiderablybecauseof黟eatcurrentfedtogrounding伊ids．Thepoten

4、tialwillbeobtainedbysecondaryequipments野ounded，whichisref．erredtodiVeningpotential．DiVertingpotentialmay，destI．oytheinsulationofsecondaryequipments，especiallycommunicationca：blesorother1ines，causingpersonnelaccidentinthesu_bstation．Firstly，aimingatquestionof黟ou

5、ndinggrids，thethesissummariesthereaserchonhowtoreducethegroundingresistanceandbalancethepotentialinthegrounding鲥dsandoptimizationmeasures．Andthen，thetransmissionpropeniesofdiV锄ingpetentialinthesubstationareanlyzedwithanImmericalcalculationmethodofsubstationgrou

6、nding班dswimunequal一potential，analysisfonnulaofcalbe’sdiVeItingpotentialisobtained．Usinggrounding鲥dssimulationsoRware—CDEGS，changemlesandinnuencingfactorsofdiVeningpotentialarediscusedontheconditionmatcablecoreiscoIl工lectedwith黟ounding嘶ds．ThesimulationreSultsis1

7、argelyconsistentwithⅡ1etrendcalculatedbytllefornlula．Finally’恤ou曲thedesi盟ofKan分ing500kVsubstationgroudingsystem，thedesi印methodisin仃oduced．TheoptimalprogramisdiscusedtlⅡDu曲r印eatedcalculationusingCDEGS．MeasuresⅥ，hichrestrainadvertingpotentialinthesubstationarein仃

8、oduced，proVidingtheoreticalbasisonengineeringdesignofsubstationgroundingsystem．keywords：GroundingGrid；GroundingResistance；AdVertingPotential；Cable；0ptimumDesign；CDEGS西南交通大学硕