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【英文标准名称】:Low-voltageswitchgearandcontrolgear-Over-currentprotectivedevices-Part2:Selectivityunderover-currentconditions
【原文标准名称】:低压开关设备和控制设备.过电流保护装置.第2部分:过电流条件下的选择性
【标准号】:IEC/TR61912-2-2009
【标准状态】:现行
【国别】:国际
【发布日期】:2009-05
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/SC17B
【标准类型】:()
【标准水平】:()
【中文主题词】:应用;断路器;电路;定义;电气器具;电气工程;电气保护设备;故障电流;低电压;过电压保护装置;防电击;保护设备;安全装置;规范(验收);开关;开关设备;电压
【英文主题词】:Applications;Circuit-breakers;Circuits;Definitions;Electricappliances;Electricalengineering;Electricalprotectionequipment;Faultcurrents;Lowvoltage;Overvoltageprotection;Protectionagainstelectricshocks;Protectiondevices;Safetydevices;Specification(approval);Switches;Switchgear;Voltage
【摘要】:
【中国标准分类号】:K30
【国际标准分类号】:29_130_20
【页数】:33P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforAcidNumberofPetroleumProductsbyPotentiometricTitration
【原文标准名称】:电位滴定法测定石油产品酸值的标准试验方法
【标准号】:ASTMD664-2009a
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:D02.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:acidnumber;B5;B10;B20;B100;biodiesel;biodieselblend;lubricants;petroleumproducts;potentiometric;strongacidnumber;titration;Acidnumber--petroleumproducts;Lubricants(fluid);Neutralizationnumbers
【摘要】:Newandusedpetroleumproducts,biodieselandblendsofbiodieselmaycontainacidicconstituentsthatarepresentasadditivesorasdegradationproductsformedduringservice,suchasoxidationproducts.Therelativeamountofthesematerialscanbedeterminedbytitratingwithbases.Theacidnumberisameasureofthisamountofacidicsubstanceintheoil,alwaysundertheconditionsofthetest.Theacidnumberisusedasaguideinthequalitycontroloflubricatingoilformulations.Itisalsosometimesusedasameasureoflubricantdegradationinservice.Anycondemninglimitsmustbeempiricallyestablished.Sinceavarietyofoxidationproductscontributetotheacidnumberandtheorganicacidsvarywidelyincorrosionproperties,thetestmethodcannotbeusedtopredictcorrosivenessofoilorbiodieselandblendsunderserviceconditions.Nogeneralcorrelationisknownbetweenacidnumberandthecorrosivetendencyofbiodieselandblendsoroilstowardmetals.1.1Thistestmethodcoversproceduresforthedeterminationofacidicconstituentsinpetroleumproducts,lubricants,biodieselandblendsofbiodiesel.1.1.1TestMethodA8212;Forpetroleumproductsandlubricantssolubleornearlysolubleinmixturesoftolueneandpropan-2-ol.Itisapplicableforthedeterminationofacidswhosedissociationconstantsinwaterarelargerthan10-9;extremelyweakacidswhosedissociationconstantsaresmallerthan10-9donotinterfere.Saltsreactiftheirhydrolysisconstantsarelargerthan10-9.Therangeofacidnumbersincludedintheprecisionstatementis0.1mg/gKOHto150mg/gKOH.1.1.2TestMethodB8212;Developedspecificallyforbiodieselandbiodieselblendswithlowacidityandslightlydifferentsolubility.Thistestmethodrequirestheuseofanautomatictitratorwithautomaticendpointseekingcapability.Note18212;Innewandusedoils,theconstituentsthatmaybeconsideredtohaveacidiccharacteristicsincludeorganicandinorganicacids,esters,phenoliccompounds,lactones,resins,saltsofheavymetals,saltsofammoniaandotherweakbases,acidsaltsofpolybasicacids,andadditionagentssuchasinhibitorsanddetergents.1.2Thetestmethodmaybeusedtoindicaterelativechangesthatoccurinoilduringuseunderoxidizingconditionsregardlessofthecolororotherpropertiesoftheresultingoil.Althoughthetitrationismadeunderdefiniteequilibriumconditions,thetestmethodisnotintendedtomeasureanabsoluteacidicpropertythatcanbeusedtopredictperformanceofoilunderserviceconditions.Nogeneralrelationshipbetweenbearingcorrosionandacidnumberisknown.Note28212;TheacidnumberobtainedbythisstandardmayormaynotbenumericallythesameasthatobtainedinaccordancewithTestMethodsD974andD3339.Therehasnotbeenanyattempttocorrelatethismethodwithothernon-titrationmethods.Note38212;AfewlaboratorieshavemadetheobservationthatthereisadifferenceinTestMethodD664resultswhenaqueousversusnonaqueousbuffersareused.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,......
【中国标准分类号】:E30
【国际标准分类号】:75_080
【页数】:10P.;A4
【正文语种】:英语