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Table302
Partialdischargeterminalinceptionvoltagecalculated
andmeasuredatACandDCvoltages
calculated
calculated
detected
detected
1105
1400
PK
903
905
XLPE
1005
1200
901
904
PDIVAC[kV]
PDIVDC[kV]
PK-XLPE-PK
1400
808
902
900
XLPE-PK-XLPE
1100
1200
901
909
a)
c)
b)
d)
Fig030120PartialdischargepatternsatACinceptionvoltageforspecimens:
a)PK;b)XLPE;c)PK-XLPE-PK;d)XLPE-PK-XLPE
ThePDphase-resolvedpatternsobtainedatPDinceptionforallspecimensatAC
voltageareshowninFigure3.12.ThePDIVACforthePKspecimenwas9.5kV
,and
XLPE,swas9.4kV
.Forthespecimenswithmixeddielectricmaterials(PK-XLPE-PK),
theinceptionlevelwas9.2kV
,whereasthiswas9.9kVfortheXLPE-PK-XLPEcombi-
nation.Generally,nolargescatterbetweenPDinceptionvoltagelevelswasobserved;
53
