PD 7639-2-1994 三相交流系统短路电流计算.依据BS7639短路电流计算用电气设备数据
时间:2024-05-20 02:35:40 来源: 标准资料网 作者：标准资料网 阅读：9857
【英文标准名称】:Short-circuitcurrentcalculationinthree-phasea.c.systems.Dataforelectricalequipmentforshort-circuitcurrentcalculationsinaccordancewithBS7639
【原文标准名称】:三相交流系统短路电流计算.依据BS7639短路电流计算用电气设备数据
【标准号】:PD7639-2-1994
【标准状态】:现行
【国别】:英国
【发布日期】:1994-04-15
【实施或试行日期】:1994-04-15
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:同步电机;铜;电气元件;异步电动机;电气设备;铝;电路;三相电流;数据;交流电流;电缆;方程;短路电流;额定功率;额定电流;电子设备及元件;导电体;阻抗;额定电压;母线;变压器;电压
【英文主题词】:
【摘要】:Comprisesdatacollectedfromdifferentcountriestobeusedwhennecessaryforcalculatingshort-circuitcurrentsinaccordancewithBS7638:1993andBS7639:1994.
【中国标准分类号】:K04
【国际标准分类号】:29_240_01;29_020
【页数】:48P;A4
【正文语种】:英语
【英文标准名称】:StandardTestMethodforDensity,RelativeDensity(SpecificGravity),andAbsorptionofFineAggregate
【原文标准名称】:密度、相对密度(比重)、和细集料吸收性的标准试验方法
【标准号】:ASTMC128-2007a
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:C09.20
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:吸收;集料;混凝土;建筑;建筑材料;细集料;细粒材料;相对密度;试验
【英文主题词】:absorption;aggregate;apparentdensity;apparentrelativedensity;density;fineaggregate;relativedensity;specificgravity
【摘要】:1.1Thistestmethodcoversthedeterminationoftheaveragedensityofaquantityoffineaggregateparticles(notincludingthevolumeofvoidsbetweentheparticles),therelativedensity(specificgravity),andtheabsorptionofthefineaggregate.Dependingontheprocedureused,thedensity,inkg/m3(lb/ft3)isexpressedasoven-dry(OD),saturated-surface-dry(SSD),orasapparentdensity.Likewise,relativedensity(specificgravity),adimensionlessquality,isexpressedasOD,SSD,orasapparentrelativedensity(apparentspecificgravity).TheODdensityandODrelativedensityaredeterminedafterdryingtheaggregate.TheSSDdensity,SSDrelativedensity,andabsorptionaredeterminedaftersoakingtheaggregateinwaterforaprescribedduration.1.2Thistestmethodisusedtodeterminethedensityoftheessentiallysolidportionofalargenumberofaggregateparticlesandprovidesanaveragevaluerepresentingthesample.Distinctionismadebetweenthedensityofaggregateparticlesasdeterminedbythistestmethod,andthebulkdensityofaggregatesasdeterminedbyTestMethodC29/C29M,whichincludesthevolumeofvoidsbetweentheparticlesofaggregates.1.3Thistestmethodisnotintendedtobeusedforlightweightaggregates.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandardforconductingthetests.ThetestresultsfordensityshallbereportedineitherSIunitsorinch-poundunits,asappropriatefortheusetobemadeoftheresults.1.5Thetextofthistestmethodreferencesnotesandfootnoteswhichprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthistestmethod.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q13
【国际标准分类号】:91_100_30
【页数】:7P.;A4
【正文语种】:
【英文标准名称】:Ophthalmicinstruments-Cornealtopographers
【原文标准名称】:眼科设备.角膜外形测量系统
【标准号】:ISO19980-2012
【标准状态】:现行
【国别】:国际
【发布日期】:2012-04-01
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC172
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Cornea;Definitions;Finemechanics;Marking;Ophthalmicequipment;Ophthalmicoptics;Ophthalmology;Opticalinstruments;Optics;Specification(approval);Testing;Topography
【摘要】:
【中国标准分类号】:C32
【国际标准分类号】:11_040_70
【页数】:22P;A4
【正文语种】:英语