电压稳定剂接枝改性对500kV直流XLPE电缆材料电气性能的影响
文档名：电压稳定剂接枝改性对500kV直流XLPE电缆材料电气性能的影响
摘要：为了研究4-乙酰氧基苯乙烯(AOS)电压稳定剂接枝改性对500kV高压直流交联聚乙烯(XLPE)电缆材料在不同温度、电场强度和接枝含量下的电气性能的影响,该文通过熔融接枝法制备了不同含量的AOS接枝XLPE(XLPE-g-AOS)试样,通过扫描电子显微镜、傅里叶红外光谱和差示扫描量热实验分别表征试样的微观形貌、理化结构和结晶特性,对试样进行了直流电导电流、空间电荷、直流击穿、热刺激去极化电流测量,得到试样在不同温度和电场强度下的电气性能参数,结合量子化学计算分析了AOS接枝对XLPE复合材料陷阱特性和电荷输运的影响.结果表明:AOS接枝使试样断面形貌更加粗糙,而较高含量接枝会出现纳米球形分散相;XLPE-g-AOS的熔融温度和结晶度比纯XLPE更高;AOS质量分数为3%的XLPE-g-AOS具有最大的浅陷阱能级和密度,且其在高温高电场下具有最低的直流电导率、最少的空间电荷积聚量、最小的电场畸变率和最高的直流击穿强度.接枝AOS引入了更深且更多的浅陷阱,形成了均匀致密的浅陷阱点阵,阻碍了载流子迁移.
Abstract：High-voltagedirectcurrent(HVDC)cables,servingasvitalequipmentforflexibleDCpowertransmission,possessadvantagessuchasextendedtransmissionreach,substantialdeliverycapacity,andminimalpowertransmissionlosses.Currently,themostextensivelyutilizedandmatureinsulationmaterialforHVDCcables,bothdomesticallyandinternationally,iscross-linkedpolyethylene(XLPE).GraftingorganicsubstancesispreferredtobeusedtoenhanceXLPEinsulationperformancethanimprovingpurityofXLPEbasematerialorincorporatingnano-fillersduetolowercost,higherstability,andbettercompatibility.CurrentdomesticandinternationalresearchonvoltagestabilizersgraftedontoXLPEisextensive,butthereisscarcedirectapplicationinindustrialinsulatingmaterialsfor500kVHVDCcables.Therefore,unsaturatedaromaticsmallmoleculesaregraftedontothemolecularchainsofcommerciallyavailable500kVHVDCXLPEinsulationmaterialinthiswork.Firstly,pureXLPEsamplesarepreparedwith1%,3%,and5%of4-acetoxystyrene(AOS)graftedontoXLPEtoacquireAOS-graftedXLPE(XLPE-g-AOS).Secondly,thesamplesarecharacterizedusingmicroscopicmorphology,Fourier-transforminfraredspectroscopy,differentialscanningcalorimetry,DCconductivity,spacecharge,DCbreakdown,andthermallystimulateddepolarizationcurrenttests.Thirdly,theeffectsofAOSgraftingonthemicrostructure,crystallizationcharacteristics,insulationproperties,andmicro-scalechargedynamicsoftheXLPEmaterialareinvestigated,andtheroleofAOSgraftinginchargecarriertrapcharacteristicsandchargetransportisanalyzed.Finally,quantumchemicalcalculationselucidatethephysicalmechanismsbywhichAOSgraftingenhancestheelectricalpropertiesofXLPEmaterialsatthemolecularlevel,andtherelationshipbetweenmicro-scalemolecularstructure,trapcharacteristics,chargebehavior,andmacroscopicelectricalperformanceisestablished.TheresultsshowAOSgraftingresultsinaroughercross-sectionalmorphologyofXLPE-g-AOS.AtanAOSweightfractionof5%,AOSself-polymerizestoformnanoscalesphericalparticles.WithincreasingAOScontent,themeltingtemperatureandcrystallinityofXLPE-g-AOSinitiallyincreaseandthendecrease.Amongthem,XLPE-g-AOSwitha3%weightfractionexhibitsoptimalcrystallizationcharacteristics.Moreover,AOSgraftingreducestheDCconductivityofXLPEunderhigh-temperatureandhigh-electric-fieldconditions,decreasestheaccumulationofspacecharges,reduceselectricfielddistortion,enhancestheDCbreakdownstrength,andincreasestheshallowtrapenergylevelsandquantities.Amongthem,XLPE-g-AOSwitha3%AOSweightfractiondemonstratesthelowestDCconductivity,theleastaccumulationofspacecharges,thesmallestelectricfielddistortion,thehighestDCbreakdownfieldstrength,andthelargestshallowtrapenergylevelsandquantitiesunderhigh-temperatureandhigh-electric-fieldconditions.WhentheAOSweightfractionincreasesto5%,boththeshallowtrapenergylevelsandquantitiesofXLPE-g-AOSdecrease,resultinginadecreaseinbreakdownstrengthandanincreaseinDCconductivityandelectricfielddistortion.Thefollowingconclusioncanbedrawnfromtheexperimentalandsimulationanalysis:ThegraftingofAOSinducesashiftinthetrapdistributionofXLPE,introducingagreaternumberanddenserarrangementofshallowtraps.Thesetrapsmanifestasbothholetrapsandelectrontraps,exhibitinghighelectrostaticpotential.Consequently,auniformandcompactlatticeofshallowtrapsisestablishedwithintheXLPEmatrix,facilitatingthedissipationofenergyduringthefrequenttrappingandde-trappingprocessesofhigh-energycharges.Thisimpedesthemigrationofchargecarriers,ultimatelyenhancingtheelectricalperformanceofthegraftedXLPE.
作者：陈向荣 黄小凡 王启隆 朱汉山 洪泽林 Author：ChenXiangrong HuangXiaofan WangQilong ZhuHanshan HongZelin
作者单位：浙江大学电气工程学院杭州310027;浙江省宽禁带功率半导体材料与器件重点实验室(浙江大学杭州科创中心)杭州311200浙江大学电气工程学院杭州310027
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(1)
分类号：TM852
关键词：电压稳定剂接枝改性交联聚乙烯高压直流电气性能
Keywords：VoltagestabilizergraftingXLPEHVDCelectricalproperties
机标分类号：TM247TM855TM726.4
在线出版日期：2024年1月18日
基金项目：国家自然科学基金，宁波市科技创新重大专项，浙江大学百人计划电压稳定剂接枝改性对500kV直流XLPE电缆材料电气性能的影响[
期刊论文]电工技术学报--2024, 39(1)陈向荣黄小凡王启隆朱汉山洪泽林为了研究4-乙酰氧基苯乙烯(AOS)电压稳定剂接枝改性对500kV高压直流交联聚乙烯(XLPE)电缆材料在不同温度、电场强度和接枝含量下的电气性能的影响,该文通过熔融接枝法制备了不同含量的AOS接枝XLPE(XLPE-g-AOS)试样...参考文献和引证文献
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电压稳定剂接枝改性对500kV直流XLPE电缆材料电气性能的影响.pdf
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