简介:通过RS485总线在罗泾码头数据采集系统中的一个应用实例,着重讲述了RS485总线及PC机与TMS320F2812DSP之间串行远程数据通信接口电路,探讨了RS485总线的通信协议,并利用自行研发的网络起重机状态监测与评估系统(NetCMAS)监测和评估现场采集到的信号。
简介:AnexclusiveinterviewwiththeauthorwaspublishedinIssue2,2010ofthisjournal,inwhichthestartingpointandmacro-strategytoconstructsmartgridinChinawaspresented.Meanwhile,thethreeperiodsofsmartgridconstructionwerealsomentioned,namelyplanningandpilotprojectconstructionperiod,overallconstructionperiod,andimprovingandupgradingperiodasitisplannedbySGCC.Attheinvitationofthisjournal,theauthorwroteanarticlefurtherintroducingtheimplementationinthefirstperiodofSGCCsmartgridprogram.Thearticlewillbepublishedintwoconsecutiveissues.
简介:本文讨论应用电动机电流频谱分析的方法检测感应电动机滚动轴承的故障。目前用于检测轴承故障工况的方法是监测轴承的机械振动频率。由于这些机械振动与电机气隙变化有关,所以对气隙磁通密度进行调节,产生的定子电流频率也可预测,这种频率是与电源频率和振动频率有关。本文首先研讨电流监测对轴承故障检测的效果,其方法是在轴承初期故障引起的振动频率和电流频率之间建立联系。对轴承故障的型式进行了考察,确定了与轴承具体结构有关的轴承特征频率。叙述了对定子电流频谱的影响,确定了相关的频率。在设计监测定子电流的故障检测图方面,这是一项重要的结果。测试结果显示了具有各种轴承故障的感应电机振动和电流频谱,它们可用来验证振动频率与电流频率之间存在的关系。测试结果清楚地表明定子电流波形可用来识别轴承故障的存在与否。
简介:Powerreliabilitypromotedin1sthalfof1997Fromthestatisticsof27municipalitiesandprovincialcapitalscollectedbythePowerReliability...
简介:Helicopterinspectionofultrahighvoltage(UHV)transmissionlineshasunmatchedadvantagescomparedtomanualworkduetotheinspectionangleandhigh-techequipmentonboard,especiallyindetailedinspectionsoftowerheadsanddefect-detectionsinvirtueofinfrared/ultraviolettechniques.Thispaperdealswithsomekeytechnicalproblemsintheinspectionsof1000kVUHVAClineswithahelicopter,suchasthesafedistanceoflive-lineworking,electromagneticfieldintensityandflightcontrol.Basedonthestudyresults,asetofUHVlineinspectionmethodswasworkedoutandappliedtotheinspectionofliveUHVlines.
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简介:Co-hostedbyChinaSocietyforHydropowerEngineeringandChinaThreeGorgesProjectCorporation,co-organizedbyChinaHydropowerEngineeringConsultingGroupCorporation,SINOHYDROCorporation,ChinaGezhouba(Group)CorporationandChinaInstituteofWaterResourcesandHydropowerResearch,organizedbyChinaElectricPowerInformationCenterBeijingZhongdianqiuzhenT&DCo.,Ltd.,supportedbyStateElectricityRegulatoryCommissionofChina,StateGridCorporationofChina,ChinaSouthernPowerGridCo.,Ltd.,ChinaHuaneng