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1、IEEETRANSACTIONSONINDUSTRYAPPLICATIONS,VOL.34,NO.1,JANUARY/FEBRUARY199857InceptionVoltageofCoronainBipolarIonizedFieldsÐEffectonCoronaPowerLossZakariyaM.Al-Hamouz,Member,IEEE,MazenAbdel-Salam,Fellow,IEEE,andAbdallahMohammadAl-Shehri,SeniorMember,IEEEAbstractÐInthispape
2、r,aniterativefinite-element-basedal-II.MATHEMATICALDESCRIPTIONOFBIPOLARIONIZEDFIELDgorithmispresentedasanumericaltoolforthesolutionoftheTheequationsdescribingthebipolarionizedfieldareasbipolarionizedfieldaroundhigh-voltagedc(HVDC)transmissionlines.Theeffectofincludinguneq
3、ualvaluesofthepositivefollows:andnegativecoronainceptionvoltagesandionmobilitiesonthecoronapowerlossisinvestigated.Inaddition,theeffectofnegativeionfieldenhancementonreducingthepositiveconductor(1)coronainceptionvoltageisalsostudied.Thepresentalgorithmisappliedtodiffere
4、ntlaboratoryandfull-scaletransmission(2)lineconfigurations.ComparisonwithpreviouslycomputedV±I(3)characteristicsshowedthatthepresentcomputedvalueswereinbetteragreementwiththeexperiment.Also,ithasbeenfound(4)thattheeffectofunequalcoronainceptionvoltagesonthecorona(5)powe
5、rloss(orcoronacurrent)isnoticeableatappliedvoltagesveryneartotheinceptionvalues.IndexTermsÐBipolarionizedfields,corona,finite-elementEquations(1)±(5)are,respectively,Poisson'sequation,theanalysis,spacechargemodifiedfields,transmissionlines.positiveandnegativecurrentdensity
6、vectors,thecontinuityconditionofthetotalcurrentdensityvector,andtheI.INTRODUCTIONcontinuityconditionofisthepermittivityoffreespace,andarethemobilitiesofpositiveandnegativeions,HEanalysisofbipolarionizedfieldsindifferentge-andarethepositiveandnegativespacechargedensityTo
7、metricalelectrodearrangements,suchashigh-voltagevalues,istheionrecombinationcoefficientinair,anddc(HVDC)transmissionlines,electrostaticprecipitators,andistheelectroncharge.spraychargershasbeenanactiveareaofresearchovertheThesolutionof(1)±(5)requiresthefollowingboundaryl
8、astfewdecades.Oneofthemajorproblemsassociatedwithconditions.bipolarionizedfieldsiscoronapowerloss.Theprospectsforthewi
