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reticalconsiderationsovermanydecades.Analyzingboththecapacitiveanddipole
models,itcanbeconcludedthatanexternalchargedetectableattheterminalsof
aspecimenorrealpowerequipmentisaquantityreflectingthePDseverity(orisat
leastproportionaltothePDcausingthedeterioration).
Thethirdmodelusedinpartialdischargeresearchisrelatedtoplasmaphysics.
Thismodelconsiderstheplasmadynamicsofthedischargeandhasbeenusedformod-
elingdielectricbarrierdischarges.Awell-establishedapproachistousedriftdiffusion
equationsthatdescribethedynamicsofelectronsaswellaspositiveandnegativeions
[CALL18].Inthismodel,processessuchasimpactionization,attachment,recombina-
tion,diffusion,anddriftofchargesarereflectedandquantitativelydescribed.Thecou-
pledapproachofthefluidequationsandPoissonequationallowustoobtainthetempo-
ralevolutionofachargeandtheelectricfielddistributionwithinthevoidduring
dischargedevelopment[PAN19].
Fig03070Partialdischargedipole(inducedcharge)model
Therearenumeroussimulationapproachesbasedbothontheanalyticmodel
[GUTF95,NIEM91,NIEM93,NIEM95]andfiniteelement/finitedifferencemodeling
(FEM/FDM)[DEME16,ILLIA15,ILLI15a,ILLIA16,ILLI17,TANA16].Inthelatter
one,certainchargesareaddedtothecavitysurfaceaftertheinceptionconditionissatis-
fied,andtheelectricfielddistributioniscalculatedbythePoissonequation.Thepro-
cessisrepeateduntilthecavityfieldwasbelowthePDextinctionvalue[PAN19].
Recently,PDmodelingbasedonplasmaphysicshasalsobeenemployedandpresented
[CALL18].
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