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Fig01020Electricalworkingstressesoninsulationsystem[FLOR12]
Thus,powerelectronicsstimulidefinenewchallengesoninsulationsystems.
High-voltagetechnologiesinpowerengineeringarecurrentlyamulti-disciplinaryfield
thatusesthelatestsolutionsfromnano-andfunctional-materials,sensorsandmicro-
electronics,powerelectronics,andtelecommunications.
Thecriteriaforselectinginsulationsystemsforhigh-voltagepowerequipmentare
madeduetothefollowingconcerns:
–insulationmaterialswiththehighestdielectricparameters(electricalstrength,
electricalresistivity)aswellasexhibitingtherequiredcharacteristics(suchas
polarandnon-polarstructures);
–thefunctionsoftheinsulationsysteminthedevelopmentofanelectricalpower
deviceandtheresultingdesignrequirements;
–theneedtoensuretherequiredlifetimeofaninsulationsystemand,therefore,
thereliabilityofadeviceinoperation.
Attheever-higher-ratedlevelsofgenerationandtransmissionequipment,the
problemofelectricalreliabilityisdirectlyrelatedtotheimmunityoftheinsulationsys-
temstooperatingexposures(inparticular,strongelectricfields).Therefore,material-
-degradationprocessesininsulationsystemsrequireathoroughunderstanding.The
electricfieldininsulationsystemsisafactorthatinitiatesanddevelopsdegradationin
dielectricstructures[FLOR20].Theeffectofthechemical-andphysical-degradation
processesofinsulationmaterialsarevariousformsofelectricaldischarges.Thesein-
cludedischargesintheinternalgaseousinclusionsofinsulationsystemsaswellason
theirsurfaces.Asthenameindicates,partialdischarge(PD)occursincaseswhere
thereisnofullinsulationbreakdownandnodirectbridgingoftheelectrodes.Hence,
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