基本信息
| 标准名称： | 辊印式饼干成型机 产品质量分等 |
| 中标分类： |
食品 >>
食品加工机械 >>
其他食品加工机械 |
| 替代情况： | JB/T 53320-94 |
| 发布日期： | 2000-01-01 |
| 实施日期： | 1999-06-09 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 5页 |
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所属分类： 食品 食品加工机械 其他食品加工机械
【英文标准名称】:StandardPracticeforPreparationofInsulatingPaperandBoardImpregnatedwithaLiquidDielectric
【原文标准名称】:浸透液态电介质的纸及纸板绝缘性电制备的标准实施规程
【标准号】:ASTMD2413-1999(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1999
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D09.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:board;dielectricstrength;dissipationfactor;drying;impulsestrength;oilimpregnation;paperpermittivity;pressboard;vacuumdrying;Dielectricbreakdownvoltage;Electricalinsulatingpaper/paperboard;Electricalproperties;Impregnateddie
【摘要】:DissipationFactorandRelativePermittivity8212;Knowledgeofthesepropertiesisimportantinthedesignofelectricalequipmentsuchascables,transformers,insulators,etc.Thenumericalproductofthesetwopropertiesofadielectricsystemisproportionaltotheenergylossconvertedtoheat,andiscalleditslossindex(seeTerminologyD1711).Theenergylossreducestheefficiencyofelectricalequipment.Theheatproducedtendstochemicallydegradethedielectricmaterialandmayevenleadtothermalrunaway.Testresultsofimpregnatedspecimenscandisclosesignificantdifferencesbetweencombinationsofpapersandoilsthatappearsimilarwhenthepapersandtheoilsaretestedseparately.Dissipationfactor,particularlyatelevatedtemperatures,isoftenchangedsignificantlybythepresenceofasmallquantityofimpuritiesineithertheliquidorthepaper.Thispracticeisusefulinthecomparisonofmaterialsandinevaluatingtheeffectsofdifferentpapersonagivenliquid.Judiciousanalysisofresultswithrespecttotime,temperature,andfieldstrengthshouldbeusefulinpredictingtheperformanceandcapabilitiesofsystemsusingthepaperandtheliquid.Foradditionalinformationonthesignificanceofdissipationfactorandrelativepermittivity,seeTestMethodsD150.TestMethodforDielectricBreakdownVoltageandDielectricStrengthofSolidElectricalInsulatingMaterialsatCommercialPowerFrequencies:Acomprehensivediscussionofthesignificanceofthedielectricstrengthtestasappliedtosolid,semi-solid,andliquidmaterialsisgiveninAppendixX1ofTestMethodD149.Otherfactorspeculiartohigh-qualitycompositeinsulations,suchasoil-impregnatedpapers,areconsideredinthefollowing:Intestsinvolvinghighelectricalstresses,immersionofcriticalpartsofatestcircuitinoilisawidelyusedtechniqueforinhibitingcorona.However,ithaslimitationsthatmustberecognizedwhenusingthesubmergedelectrodeoptionofthispractice(Note1).Attackonthepaperbycoronageneratedinthesurroundingfluidatelectrodeedgescanoccurwhetherthefluidisairoroil.Coronaoccursatconsiderablyhighervoltagesinoilthaninair.Thickanddensepapersaremorelikelytocausedischarge-initiatedbreakdowns.Forinterpretationofbreakdownmeasurementsthenumberofedgebreakdowns,implyingdischarge-initiatedbreakdowns,shouldbeconsidered.Note18212;Twotechniquesareinuseintheindustryfortestingspecimensfordielectricbreakdownvoltage.Inone,thetestismadewiththeelectrodesandtestspecimensubmergedintheimpregnatingliquidwhileintheothertheelectrodesarenotsubmerged,thatis,thespecimenistestedinair.Muchdatahasbeenaccumulatedusingthelattertechnique.Thesetechniquesyielddifferentvaluesofbreakdownvoltage.TestMethodD149statespreferencefortestingmaterialsinthemediuminwhichtheyareused.Theuseofsubmergedelectrodesfollowsthispreference.Whentestingthickinsulatingboards,theuseofsubmergedelectrodesisgreatlypreferred.Theresultsofpowerfrequencytestsonoilimpregnatedpapersareusefulforscreening,research,andqualitycontrol,providedthatconsiderablejudgmentisexercisedininterpretingtheresults.Theapplicationofthetestresultstoequipmentdesignandservicerequiresparticu........
【中国标准分类号】:K15
【国际标准分类号】:29_035_10
【页数】:4P.;A4
【正文语种】:英语