低溫電介質(zhì)電氣特性測試系統(tǒng)的研制.pdf

1、華北電力大學(xué)(北京)碩士學(xué)位論文低溫電介質(zhì)電氣特性測試系統(tǒng)的研制姓名：牛田野申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電氣工程；高電壓與絕緣技術(shù)指導(dǎo)教師：丁立健201106華北電力大學(xué)碩十學(xué)位論文AbstractSuperconductingpowertechnologyisanewadvancedtechnologywithwideapplicationandhugespacefordevelopmentThelowtemperatureelectri

2、calcharacteristicsofinsulatingmaterials，whichplaysanimportantroleinsuperconductingpowerequipment，hasbecomeacriticalfactorinfluencingtheoperatingperformanceandreliabilityofpowerequipmentTheinsulationsystemofmanysupercondu

3、ctingpowerequipmentsactuallyworksinthecryogenicvacuumenvironment，andwiththerapiddevelopmentofmaterialsscienceandtheemergingofinnovativeinsulatingmaterials，studyingtheinsulatingpropertiesofmaterialsatthelowtemperaturehasb

4、ecomeanecessityTheresearchresultscallnotonlymeettheneedsofengineeringapplicationsofsuperconductingpowerequipment，butalsoprovideexperimentaldatafordielectrictheorystudyTostudythelowtemperatureelectricalcharacteristicsofin

5、sulatingmaterials，ameasuringsystemfortestingdielectrics’electricalcharacteristicsatthelowtemperaturehasbeendevelopedinthispaperthemaincontributionsareasfollows：1Thecryogenicvacuumsystemwhichprovidescryogenichighvacuunlte

6、stenvironmentfortestingtheelectricalcharacteristicsofinsulatingmaterialsThetestresultsshowedthatthevacuumwithinthesystemcatlreachashighaslO‘Painloomtemperature，and10“)PainlowtemperatureInthistestsystem，liquidnitrogenisus

7、ed鶴coolantwhichCanmakethepolymerfilmssample’temperaturereachaslOWas78IC2ThetemperaturemonitoringandcontrollingsystemwhichiSbasedonLabviewsoftwareplatform，canmonitorrealtimeandaccuratetemperaturesatmultiplelocationsandcan

8、achievecontrolofsampletemperaturebycontrollingtheheatingdeviceforheatingcomponentsaccordingtothesotconditionsWhenliquidnitrogenisused鶴coolantthetemperaturecontrollingsystemcanmakethepolymerfilmssample’temperatureadjustab

9、lefrom78Kto300K3Theelectrodesystem，whichallowsbreakdowntestforpolymerfilmsofdifferentthicknessesincryogenicvacuulnenvironmentcanavoidtheadverseeffectsofshrinkagedeformationofmaterialsatcryogenictemperatureMoreovertheelec

10、trodesystemcarlensuregoodcontactbetweensamplesandelectrodesandcanrealizetheexcellentheattransmissionfromcoolanttanktosamplesSOastoachievethetesttemperature4ThebreakdowntestofPIPETandPTFEfilmshavebeencarriedonusingthedeve

11、lopedtestsystemThetestresultsshowedthattheinfluenceofthetemperatureonthebreakdownvalueisvariedfromdifferentmaterialsT11etestsalsoshowthattlledevelopedtestsystemcanmaintainareliableandstableoperationinaccordance謝mthesette