简介：TheDevelopmentof3DCADtechnologypresentsaneweffectivetoolindesigningoutdoorswitchyardforpowerplant.Anewlayoutpatternof330kVswitchyard(SWYD)ofalignedtypewasstudiedwiththismethod.Someissuesaboutcomputerized3DmodesappliedinSWYDdesignarealsodiscussedinthispaper.

简介：TheConstructionMachineryDivision(CMD)intheRe-searchInstituteofElectricPowerConstruction(EPCRI)isaR&Dorganizationspecializedonconstructionmachineryandtechnologyforthermalpowerstationandtransmission&distributionprojects.Itwasestablishedin1964.Therearenow45scientificre-

简介：纵向压电应变常数d33是表征压电陶瓷材料机电转换性能的重要参数之一.有别于常规的静态、动静态检测方式,设计了一种基于扫频方法的新型d33参数测试装置.通过检测不同频率信号激励时线路的电流变化,实现压电陶瓷d33参数的检测计算.该装置具有性能参数检测操作方便、检测过程效率高等特点.

简介：<正>ThepaperoutlinestheYangtzeThreeGorgeswaterconservancycomplex.ItdescribesthepowertransmissionanddistributionequipmentintheThreeGorgesLeftBankHydropowerStation,especiallylargehigh-voltagedistributiondevices.ItelaboratesthemeasuresforsuppressingGISover-voltageandthetestsonVFTO,besidestechnicalmeasurestoensuresafetyandstabilityofpowersysteminthestation.Italsomakessomeanalysesandsummariesabouttheproblemsencounteredinoperationoftheequipment.

简介：Accordingtoperformanceanalysisofathree-phasegrid-connectedinvertermathematicalmodelofadirectly-drivenwindturbinewithapermanentmagnetsynchronousgenerator(D-PMSG)underunbalancednetworkvoltageconditions,adualcurrent-loopcontrolstrategy(DCC)orientedonpositivevoltageandnegativecurrentisproposedtoinhibittheDCvoltagefluctuation.Meanwhile,anotchfilterisintroducedintotheconventionalcontrolstrategyofaphase-lockedlooptocompletethelowvoltageridethrough(LVRT)abilityofthewindgenerator.A1.5-MWD-PMSGwithaback-to-backIGBTfrequencyconverterwassimulatedinthePSCAD/EMTDCenvironment,andsimulationresultsshowedthat:themaximumwindpowertrackingwasachievedinthissystemandtheproposedDCCstrategycouldsuccessfullyinhibittherisingagingofDCvoltageandenhancetheride-throughcapabilityofD-PMSGwindgenerationsystemunderunbalancednetworkvoltageconditions.

简介：从企业品牌的角度，中国企业跨国经营模式大致分成3种类型：创牌模式、借牌模式、混合品牌模式。从跨国经营风险、企业拥有的资源和能力、该模式有助于解决的问题3方面对这3种跨国经营模式进行分析。

简介：Basedonthecalculationandanalysisofenergy-savingbenefitundervariousoperatingconditions,andtheinvestmentpaybackperiodforthelowpressureeconomizerofthe3rdstageprojectofLongkouPowerPlant,theoptimumoperatingconditionsofthesystemanditsreasonableheatingsurfacearedefined,andthefeasibilityofthedesignalternativeofthelowpressureeconomizersystemisverified.

简介：研究了轧制Mg-3Al-1Zn合金的动态再结晶组织、晶粒尺寸、织构分布和力学性能。结果表明，晶粒尺寸、晶粒大小均匀程度、再结晶组织份数及织构分布共同影响合金的力学性能。晶粒尺寸和织构类型相同时，形变组织份数越高，屈服强度越高；细小晶粒和均匀的晶粒分布易于获得高延伸率；{0002}基面织构对轧制合金屈服强度的各向异性有显著影响。

简介：25年前，美国电力系统（AEP）为约翰·E·阿莫斯（JohnE.Amos）电厂3号机组购买了第一批6台1300MW新机组中的第一台，由于应用了AEP的运行经验和制造厂的设计和制造能力几方面高度协同配合，制造出了异常可靠的发电机，运行这些年来，几乎没有故障。

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