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【英文标准名称】:Electricalsafetyinlowvoltagedistributionsystemsupto1000Va.c.and1500Vd.c.-Equipmentfortesting,measuringormonitoringofprotectivemeasures-Part9:EquipmentforinsulationfaultlocationinITsystems
【原文标准名称】:交流1000V和直流1500V以下低压配电系统中的电气安全防护措施的试验、测量和监控设备第9部分:IT系统中的绝缘故障定位设备
【标准号】:IEC61557-9-1999
【标准状态】:作废
【国别】:国际
【发布日期】:1999-09
【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/TC85
【标准类型】:()
【标准水平】:()
【中文主题词】:绝缘监视装置;直流装置;绝缘电阻;参比状态;故障探测;额定电压;低压设备;绝缘;试验设备;低压电器;额定电流;低压电源;保护措施;控制仪器;交流电网络;交流电流;直流电流;标准使用;监视装置;试验准备工作;电流;测量设备;电磁试验;监控;通信网;测量;测量仪器;样品;电源电压;开关电路;信息技术系统;绝缘表;直流网;绝缘失效;电气安全;控制;操作说明书;额定电压装置;电气工程;信息技术;(电网)电源;定义;定义;试验;规范(验收);电信
【英文主题词】:Alternatingcurrent;Alternatingcurrentnetworks;Communicationnetworks;Controlinstruments;Controlling;Currents;Definition;Definitions;Directcurrent;Directcurrentinstallations;Directcurrentnetworks;Electricmains;Electricalengineering;Electricalsafety;Electromagnetictests;Faultfinding;Inscription;Installationsforratedvoltages;Insulatingmonitoringdevices;Insulatingresistance;Insulationfault;Insulationmeters;Insulations;ITsystems;Lowvoltagemains;Low-voltageequipment;Low-voltageinstallations;Measuring;Measuringequipment;Measuringinstruments;Monitoring;Monitoringdevice;Nominaluse;Operatinginstructions;Protectivemeasures;Ratedcurrent;Ratedvoltage;Referenceconditions;Specification(approval);Specimens;Supplyvoltages;Switchingcircuits;Telecommunications;Testequipment;Testing;Testingset-ups;Troubleshooters
【摘要】:ThispartofIEC61557specifiestherequirementsforinsulationfaultlocationsystemswhichlocalizeinsulationfaultsinanypartofthesysteminunearthedITa.c.systemsandunearthedITa.c.systemswithgalvanicallyconnectedd.c.circuitshavingnominalvoltagesupto1000Va.c.,aswellasinunearthedITd.c.systemswithvoltagesupto1500Vd.c.,independentofthemeasuringprinciple.ThispartistobeusedinconjunctionwithIEC61557-1.NOTE1-ITsystemsaredescribedinIEC60364-4-41amongstotherliterature.Additionaldataforaselectionofdevicesinotherstandardsshouldbenoted.NOTE2-Furtherinformationoninsulationfaultlocationcanbefoundinthefollowingstandards:IEC60364-4-41,subclause413.1.5.4,andIEC60364-5-53,subclause531.3.NOTE3-Aninsulationfaultlocationsystemusuallyconsistsofseveralfunctionalmodules(seefigure1).Allorsomeofthefunctionalmodulesmaybecombinedinonedevice.Thefunctionalmodulesandashortdescriptionoftheirfunctionarementionedbelow:-insulationmonitoringdeviceaccordingtoIEC61557-8;-controldevice,portableorpermanentlyinstalled:thecontroldevicespecifiesthesequenceofthetestprocedureandcontainslogicaloperationsforinsulationfaultlocationandforfaultalarm;-testdevice,portableorpermanentlyinstalled:thetestdevicecontainsthetestcurrentgenerator;-couplingunit,portableorpermanentlyinstalled:thecouplingunitincombinationwiththetestdeviceconstitutestheconnectiontothesystemtobemonitored;-residualcurrenttransformerorcurrentclamp:theseareusedforthedetectionofthetestcurrentandareconnectedtoanevaluator;-evaluator,portableorpermanentlyinstalled:theresidualcurrenttransformersareconnectedtotheevaluatortodetectthetestcurrent.NOTE4-Note3givesanexampleofthefunctionalmodulesininsulationfaultlocationsystems.Thecombinationofmodulesmayvarydependingontheversion(portableorpermanentlyinstalled).NOTE5-Insulationfaultlocationsystemswithanindependenttestcurrentsourcemayalsobeusedforinsulationfaultlocationinde-energizedsystems.
【中国标准分类号】:K20
【国际标准分类号】:17_220_20
【页数】:23P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforGradingSpunYarnsforAppearance
【原文标准名称】:短纤纱外观的分级的标准试验方法
【标准号】:ASTMD2255-1996
【标准状态】:作废
【国别】:美国
【发布日期】:1996
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:纺织试验;纺织材料;分级(质量);纱;外观;试验
【英文主题词】:appearance;yarn;textiles;testing;textiletesting;grading(quality)
【摘要】:
【中国标准分类号】:W04
【国际标准分类号】:59_080_20
【页数】:5P;A4
【正文语种】:英语