JJG (电子) 04006-1987 BJ2913型场效应管参数测试仪(试行)
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基本信息
| 标准名称： | BJ2913型场效应管参数测试仪(试行) |
| 中标分类： | 综合 >> 计量 >> 无线电计量 |
| 发布日期： | |
| 实施日期： | 1996-04-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 8页 |
适用范围
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前言
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引用标准
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所属分类： 综合 计量 无线电计量
下载地址: 点击此处下载
【英文标准名称】:StandardTestMethodforVoltageEnduranceofSolidElectricalInsulatingMaterialsSubjectedtoPartialDischarges(Corona)ontheSurface
【原文标准名称】:固体电绝缘材料表面对局部放电(电晕)的耐电压性标准试验方法
【标准号】:ASTMD2275-2001(2008)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2001
【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】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:partialdischarge;surfacedischarge;thresholdvoltage;voltageindurance;voltagestressx2013;timecurve;voltx2013;timecurve;Corona;Electricalinsulatingsolids;Electricalproperties;S
【摘要】:Thistestmethodisusedtocomparetheenduranceofdifferentmaterialstotheactionofcoronaontheexternalsurfaces.Apoorresultonthistestdoesnotindicatethatthematerialisapoorselectionforuseathighvoltageorathighvoltagestressintheabsenceofsurfacecorona.Surfacecoronashouldbedistinguishedfromcoronathatoccursininternalcavitiesforwhichnostandardizedtesthasbeendeveloped.Evaluationofendurancebycomparisonofdataonspecimensofdifferentthicknessisnotvalid.Theprocessingofthematerialmayaffecttheresultsobtained.Forinstance,residualstrainsproducedbyquenching,orhighlevelsofcrystallinitycausedbyslowcoolingmayaffecttheresult.Also,thetypeofmoldingprocess,injectionorcompression,maybeimportantespeciallyifthemixingoffillersortheconcentrationandsizesofgas-filledcavitiesarecontrolledinanydegreebytheprocess.Indeed,thistestmethodmaybeusedtoexaminetheeffectsofprocessing.Thedataaregeneratedintheformofasetofvaluesoflifetimesatavoltage.ThedispersionoffailuretimescanbeanalyzedusingWeibullorextremevaluestatisticstoyieldanestimateofthecentralvalueofthedistributionanditsstandarddeviation.Thisisparticularlyrecommendedwhenthedispersionoffailuretimesislarge,andacomparisonoflifetimesoftwomaterialsmustbemadeataspecifiedlevelofconfidence.Thistestisoftenusedtodemonstratethedifferencesbetweendifferentclassesofmaterials,andtoillustratetheimportanceofeliminatingcoronainanyapplicationofaparticularmaterial.Whenthetestisusedforsuchpurposesorothersimilarones,theneedforprecisionisreduced,andcertaintimesavingtechniques,suchastruncatingatestatthetimeofthefifthfailureofasetofnine,andusingthattimeasthemeasureofthecentraltendency,arerecommended.Twosuchtechniquesaredescribedin10.2.Bothtechniquesremovethenecessityoftestingbeyondmedianfailure,andreducetherequiredtestingtimetoapproximatelyhalfofthatrequiredtoobtainfailuresonallspecimens.Insulatingmaterialsoperatinginagaseousmediumaresubjectedtocoronaattackatoperatingvoltageonsometypesofelectricalapparatusinthoseregionswherethevoltagegradientinthegasexceedsthecoronainceptionlevel.Onothertypesofequipment,wheredetectablecoronaisabsentinitially,itmayappearlaterduetotransientover-voltagesorchangesininsulationpropertiesattendingaging.Certaininorganicmaterialscantoleratecoronaforalongtime.Manyorganicmaterialsaredamagedquicklybycorona,andforthese,operationwithnodetectablecoronaisimperative.Thistestmethodintensifiessomeofthemorecommonlymetconditionsofcoronaattacksothatmaterialsmaybeevaluatedinatimethatisrelativelyshortcomparedtothelifeoftheequipment.Aswithmostacceleratedlifetests,cautionisnecessaryinextrapolationfromtheindicatedlifetoactuallifeundervariousoperatingconditionsinthefield.Thefailureproducedbycoronamaybeduetooneofseveralpossiblefactors.Thecoronamayerodetheinsulationuntiltheremaininginsulationcannolongerwithstandtheappliedvoltage.Thecoronamaycausetheinsulationsurfacetobecomeconducting.Forinstance,carbonizationmayoccur,sothatfailureoccursquickly.Ontheotherhand,compoundssuchasoxalicacidcrystalsmaybeformed,aswithpolyethylene,inwhichcasethesurfaceconductancewillvarywithambienthumidity,andatmoderatehumiditiestheconductancemaybeattheproperleveltoreducethepotentialgradientattheelectrodeedge,andthuscauseeitherareductionintheamountofcorona,oritscessation,thusretardingfailure.Thecoronamaycauseax201C;treeing【英文标准名称】:AMERICANNATIONALSTANDARDFORARCHITECTURALDOORTRIM
【原文标准名称】:建筑门细木工美国国家标准
【标准号】:ANSI/BHMAA156.6-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:棒材;建筑材料;尺寸规格;门拉手;门号牌;门;五金件(建筑);锁匠工作;保护(装置);推;推拉;强度试验;试验材料;装饰
【英文主题词】:Bars(materials);Buildingmaterials;Dimensions;Doorhandles;Doorplates;Doors;Ironmongery(buildings);Locksmithwork;Protection;Push;Push-pull;Strengthtests;Testmaterials;Trim
【摘要】:ThisStandardcontainsrequirementsfordoorprotectionplates,dooredgings,pushplates,doorpulls,pushbars,andpullbars.Includedarestrengthandfinishtests,anddimensionalandmaterialcriteria.
【中国标准分类号】:P32
【国际标准分类号】:91_190
【页数】:
【正文语种】:英语
【原文标准名称】:固体电绝缘材料表面对局部放电(电晕)的耐电压性标准试验方法
【标准号】:ASTMD2275-2001(2008)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2001
【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】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:partialdischarge;surfacedischarge;thresholdvoltage;voltageindurance;voltagestressx2013;timecurve;voltx2013;timecurve;Corona;Electricalinsulatingsolids;Electricalproperties;S
【摘要】:Thistestmethodisusedtocomparetheenduranceofdifferentmaterialstotheactionofcoronaontheexternalsurfaces.Apoorresultonthistestdoesnotindicatethatthematerialisapoorselectionforuseathighvoltageorathighvoltagestressintheabsenceofsurfacecorona.Surfacecoronashouldbedistinguishedfromcoronathatoccursininternalcavitiesforwhichnostandardizedtesthasbeendeveloped.Evaluationofendurancebycomparisonofdataonspecimensofdifferentthicknessisnotvalid.Theprocessingofthematerialmayaffecttheresultsobtained.Forinstance,residualstrainsproducedbyquenching,orhighlevelsofcrystallinitycausedbyslowcoolingmayaffecttheresult.Also,thetypeofmoldingprocess,injectionorcompression,maybeimportantespeciallyifthemixingoffillersortheconcentrationandsizesofgas-filledcavitiesarecontrolledinanydegreebytheprocess.Indeed,thistestmethodmaybeusedtoexaminetheeffectsofprocessing.Thedataaregeneratedintheformofasetofvaluesoflifetimesatavoltage.ThedispersionoffailuretimescanbeanalyzedusingWeibullorextremevaluestatisticstoyieldanestimateofthecentralvalueofthedistributionanditsstandarddeviation.Thisisparticularlyrecommendedwhenthedispersionoffailuretimesislarge,andacomparisonoflifetimesoftwomaterialsmustbemadeataspecifiedlevelofconfidence.Thistestisoftenusedtodemonstratethedifferencesbetweendifferentclassesofmaterials,andtoillustratetheimportanceofeliminatingcoronainanyapplicationofaparticularmaterial.Whenthetestisusedforsuchpurposesorothersimilarones,theneedforprecisionisreduced,andcertaintimesavingtechniques,suchastruncatingatestatthetimeofthefifthfailureofasetofnine,andusingthattimeasthemeasureofthecentraltendency,arerecommended.Twosuchtechniquesaredescribedin10.2.Bothtechniquesremovethenecessityoftestingbeyondmedianfailure,andreducetherequiredtestingtimetoapproximatelyhalfofthatrequiredtoobtainfailuresonallspecimens.Insulatingmaterialsoperatinginagaseousmediumaresubjectedtocoronaattackatoperatingvoltageonsometypesofelectricalapparatusinthoseregionswherethevoltagegradientinthegasexceedsthecoronainceptionlevel.Onothertypesofequipment,wheredetectablecoronaisabsentinitially,itmayappearlaterduetotransientover-voltagesorchangesininsulationpropertiesattendingaging.Certaininorganicmaterialscantoleratecoronaforalongtime.Manyorganicmaterialsaredamagedquicklybycorona,andforthese,operationwithnodetectablecoronaisimperative.Thistestmethodintensifiessomeofthemorecommonlymetconditionsofcoronaattacksothatmaterialsmaybeevaluatedinatimethatisrelativelyshortcomparedtothelifeoftheequipment.Aswithmostacceleratedlifetests,cautionisnecessaryinextrapolationfromtheindicatedlifetoactuallifeundervariousoperatingconditionsinthefield.Thefailureproducedbycoronamaybeduetooneofseveralpossiblefactors.Thecoronamayerodetheinsulationuntiltheremaininginsulationcannolongerwithstandtheappliedvoltage.Thecoronamaycausetheinsulationsurfacetobecomeconducting.Forinstance,carbonizationmayoccur,sothatfailureoccursquickly.Ontheotherhand,compoundssuchasoxalicacidcrystalsmaybeformed,aswithpolyethylene,inwhichcasethesurfaceconductancewillvarywithambienthumidity,andatmoderatehumiditiestheconductancemaybeattheproperleveltoreducethepotentialgradientattheelectrodeedge,andthuscauseeitherareductionintheamountofcorona,oritscessation,thusretardingfailure.Thecoronamaycauseax201C;treeing【英文标准名称】:AMERICANNATIONALSTANDARDFORARCHITECTURALDOORTRIM
【原文标准名称】:建筑门细木工美国国家标准
【标准号】:ANSI/BHMAA156.6-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:棒材;建筑材料;尺寸规格;门拉手;门号牌;门;五金件(建筑);锁匠工作;保护(装置);推;推拉;强度试验;试验材料;装饰
【英文主题词】:Bars(materials);Buildingmaterials;Dimensions;Doorhandles;Doorplates;Doors;Ironmongery(buildings);Locksmithwork;Protection;Push;Push-pull;Strengthtests;Testmaterials;Trim
【摘要】:ThisStandardcontainsrequirementsfordoorprotectionplates,dooredgings,pushplates,doorpulls,pushbars,andpullbars.Includedarestrengthandfinishtests,anddimensionalandmaterialcriteria.
【中国标准分类号】:P32
【国际标准分类号】:91_190
【页数】:
【正文语种】:英语
