Quality Control of Extruded HVDC Cables: Detection of Critical Flaws Using Low Frequency Voltage Endurance Testing Quality Control of Extruded HVDC Cables: Detection of Critical Flaws Using Low Frequency Voltage Endurance Testing.pdfVIP
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Quality Control of Extruded HVDC Cables: Detection of Critical Flaws Using Low Frequency Voltage Endurance Testing Quality Control of Extruded HVDC Cables: Detection of Critical Flaws Using Low Frequency Voltage Endurance Testing
高 电压技术 第 37卷 第 11期 2011年 11月 30日 2664 HighVoltageEngineering,Vo1.37,No.11,November30,2O11 QualityControlofExtrudedHVDCCables:Detection ofCriticalFlawsUsingLow Frequency VoltageEnduranceTesting ErlingIldstad,FrankMauseth,MildridSelsjord,RolfHegerberg (1.DepartmentofElectricPowerEngineering,NTNU ,Trondheim ,Norway; 2.SINTEF EnergyResearch,Trondheim ,Norway) Abstract:Themainpurposeoftheworkpresentedhereistoevaluatedifferentmethodsforqualitycontro1ofpolymer icinsulatedHVDC cables.Theinsightgainedcanheusedtoevaluateproposedtestmethodsforqualityassuranceof longlengthsofpolymerinsulatedpowercables.LaboratoryexperimentswereperformedusingbothRogowskishaped testobjectsandmodelcables.insulatedwithXLPEcontainingimbeddedsphericallyshapedparticles.Testswereper— formedbystressingthetestobiectwithAC (5OHz),VLF (O.1Hz)andDC voltagesandmeasuringtimetobreak— downatthedifferentvoltages.Theslopeofthevoltage—timecurvefor0.1and50Hzwerefoundtobeparallelshow— inghigherbreakdownstrengthfor0.1Hzthan50Hz.Thenumberofperiodstobreakdownissomewhathigherfor O.1Hzthanfor50Hz.ThebreakdownstrengthforDC was—muchhigherthanforbothAC 50Hzand0.1Hz.The resultsindicatethattheVLFtestvoltageneedstobe2to3timeshigherthanat50Hzpowerfrequencyinordertoe— liminatethesamedefectswithinacomparabletime. Keywords:HVDC;VLF;powercables;qualitycontrol;testmethods;extrudedinsulation CLC number:TM247.1 Documentcode:A ArticleNo:1003—6520(2011)11—2664—08 therangeo{20~4OHz.CIGRE hasissuedarec— O IntrOductiOn ommendation for testproceduresfor routine tes— tingoflongHVAC cablesL .InCIGRE Technica
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