简介：IntroductionAnalysisandforecastofloadcharacteristicsareimportantaspectsinpowermarketanalysisandprediction.Correctlymasteringgridloadcharacteristics

简介：Atthebeginningof2008,theCentral,EastandSouthChinasufferedararesnowandicedisaster.Afterthedisaster,powergenerationandpowergridenterprisesfacedabigproblemofpowercoalsupply.

简介：ThispaperpresentsthedataonoperationreliabilityindicesandrelevantanalysestowardChina'sconventionalpowergeneratingunitsin2009.Theunitsbroughtintothestatisticalanalysisinclude100-MWorabovethermalgeneratingunits,40-MWorabovehydrogeneratingunits,andallnucleargeneratingunits.Thereliabilityindicesembodiedincludeutilizationhours,timesandhoursofscheduledoutages,timesandhoursofunscheduledoutages,equivalentforcedoutagerateandequivalentavailabilityfactor.

简介：Basedontheanalysisandcomparisonofcoal,oilandwaterconsumptionsinthermalpowerplants,thispaperintroducesthepresentstateofresourcesutilizationinthermalpowerindustry,andpointsoutthatthepoten-tialofresourcessavingliesmainlyincuttingdowncoalconsumptionandincreasingtheratiooflarge-sizedthermalunits.Measuresandsuggestionsforupgradingresourcesutilizationareputforward,suchastooptimizecoal-firedthermalpowerstructure,developcogeneration,cleancoalcombustiontechniquesandgas-steamcombinedcycletechniques.Theexistingthermalpowerplantsshallexecutetechnicalretrofitsandpopularizewatersavingtechniques.

简介：ThestatisticdataofresidentialelectricityconsumptionshowninthetableP.58arequotedfromtheEnergyStatisticalYearBookpublishedbytheNationalStatisticBureauandthestatisticsissuedbytheMinistryofEnergy.Thereasonofthedifferencesbetweenthedatafromthetwosaidsourcesisthatthelatterdoesnotincludetheconsumptionsup-pliedbythelocalsmallpowersources.Fromthestatisticaldatawecanseethat:

简介：I.IntroductionA31.2km110kVtransmissionlineisdesignedtooperateunder35kVwithconductormodelAC-185(aluminiumstrand--28x2.87mm~2,steelcore--7x2.50mm~2)ataverageoper-atingstressof24.2%,andoverheadgroundwiremodelC-50(steelstrand--7x2.97mm~2)ataverageoperatingstressof20.6%.Thewholelinehas130pole-towers,mostofwhichareofprestressedconcretedouble-polestructure,asshowninFig.1.The

简介：IntroductionWithever-increasingofpowersources,thecapabilityofpowersupplywasfurtherenforcedin2007.Thismetthestrongdemandofnationaleconomydevelopment.Restruc-turingofpowersourceswasdeepening,ofwhich"substi-tutinglargepowerunitsforsmallones"startedwell,theinstalledcapacityofwindpowerwasdoubledandobviousresultswereachievedintheenergy-conservationandpollu-

简介：1.IntroductionConductorgallopinghascausedmoreandmoredisturbancestothesecureoperationofpowersystemfrom1930untilnow.Al-thoughmanyauthorshavebeenstudyingitstheoryandpreventivemeasuresbywind-tunnelandfieldmodellingtestsandgettingsome

简介：InJanuary2008,asuddendisastercausedbyicingandsnowinghappenedinlargeareasofCentralChinaandSouthChina.TheequipmentsofHunanpowergridwereseriouslydamagedduringtheicingandsnowingdisaster.AnexpertgroupfromChinaElectricPowerResearchInstitute(CEPRI)wasorganizedandwenttoHunanprovinceforfieldinvestigation.Asasummaryofthisinvestigation,thispaperintroducespowerequipmentdamages,suchasflashovercausedbyicing,collapseoftowers,conductorbreakageanddamageofsubstationequipments.Thecountermeasuresadoptedforthisicingandsnowingdisasterarealsosummarized.Theanalysisshowsthattheraremeteorologicalconditionisthemainreasonforlarge-areadamageofHunanpowergrid.IntheicingdisasterofHunanpowergrid,theicethicknessgreatlyexceedsthepermissiblelimitofdesign,thusitisnecessarytoimprovethedesignparametersreasonablytoagainsticingoftransmissionlines,andthedesignofexternalinsulationandtheanti-icingtechnologyforsubstationsarealsoneedtobeenhanced.

简介：1.Speedupthedevelopmentofthefifthenergyresource-electricalenergy-savingTheworldexperiencedseriousenergycrisestwiceinthe1970’s,butthesituationwasalleviatedatthebeginningofthe1980s.Comprehensivereportspublishedbyinternationalenergyorganiza-tionsin1986summeduptheimportantachievementsofenergy-sav-ingobtainedin19mainindustrializedcountriesintheperiodof1973to1985.Theirprimaryexperienceistobringaboutthestructuralenergy-savingbyrelyingonthetechnicalprogress,thatis,changingthehighenergyconsumptionindustriestolowconsumptionones.Thischangetidedthemsuccessfullyovertheenergycrises,moreo-

简介：Sincethefirstbatchof350-MWsupercriticalutilityboilerswasputintooperation,theexhaustfluegastemperatureoftheboilershasalwaysbeenhigherthanthedesignedvalue.Themainreasonisthattheheatabsorbedbytheairheaterisnotsufficient.InHuanengDongfangPowerPlant,theexhaustfluegastemperatureisloweredthroughmodificationstotheeconomizerandtheairheater.Theexperimentalresultsrevealthateveryyear,eachboilercouldsave3850tonsofstandardcoalandreduce85tonsofSO2and9000tonsofCO2respectivelyafterretrofit.

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

简介：SummaryThispaperanalysestheturbinebypasssystemdesignandoperationmodefordomesticallymade300MWunitwithtechnologyimported,andputforwardsomesuggestionsaboutwhetherbypasssystemisneeded.1.0IntroductionThedomesticallymadeWHCo,patent300MWunitisproducedaccordingtothetechnologyofAmericanWestinghouse(WH)Corporation.Theoriginalimported

简介：ThispaperpresentsthebehavioranalysisofmodularmultilevelconverterunderDCpole-to-poleshort-circuitfault,whichisanimportantissueinfaultmanagement,electricalsystemdesignandMMCbasedpowersystemprotectionandcontrol.Firstly,thetransientbehaviorisanalyzedandtheconductionoverlappingangleγisdefined.Secondly,sevenpossibleshort-circuitcurrentpathsinducedbydifferentγvaluesareidentified,andthecorrespondingengineeringshort-circuitcurrentcalculationmethodsforbothACandDCsidesareproposed.Andthen,theinfluencesofimpedancedistributionfactorkandequivalentshort-circuitresistanceRSConshort-circuitcurrentsareelaborated.Finally,casestudyisusedtoverifytheeffectivenessoftheproposedanalysismethods.

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

简介：摘要：随着电力行业的发展，电网规模也越来越大，加强电力系统中变电设备的运行质量至关重要。因此，加强变压器导线维护技术的改进，不仅保证了变电站设备的安全运行，而且在一定程度上进一步延长了其使用寿命，为整个电力系统的安全运行奠定了坚实的基础。

简介：摘要我国在改革开放以来大力发展经济建设，已经初步完成工业大国的转变，在这个过程中电力能源起到了不可或缺的能源作用。随着人民生活的日益改善，家用电器也在不断增加，对于我国供电企业的抄表、核算、收费工作带来了巨大的挑战。供电企业在传统的抄核收工作中存在着诸多问题，主要是依靠人为抄表，对数据进行统计核算，容易造成误抄问题。我国供电企业对于电网运行中所消耗的电能量也需要做出数据统计，在传统抄核收工作中并未在这方面提高重视，也造成了供电企业在每年都会出现一些死账。接下来在本文中就详细介绍下供电企业抄表核算收费工作中经常会遇到的一些问题，针对这些问题供电企业究竟采取了哪些措施，从而减少了供电企业的经济损失，提高了供电企业抄核收工作的效率，也更好地满足了客户的需求。

简介：摘要我国是一个多自然灾害的国家，长期以来雷电灾害给人类和地球上的生物带来灾难性的打击。由于地理位置和气候条件使得武宣县成为雷电自然灾害的重灾区。而农村对雷电灾害现象的发生、发展过程认知度严重不足，雷电灾害产生时农民的防护意识依旧淡薄,防御知识仍存在盲区。因此关注农民生活,加强农村气象服务和雷电防灾减灾工作,建立起完善的农村雷电灾害防御管理体系刻不容缓。

简介：摘要电力作为一种特殊的商品，以其自身的无形性，不可储存性，产、供、销于一体的不可分离性，决定了新形势下供电企业的营销思想、营销策略、营销组织、营销措施都有别于其它商品。随着社会经济的不断发展，居民用电量的不断增加，电力营销工作也面临着新的挑战。同时，也给也存在着一些风险点，本文针对这些风险点进行分析，并提出相应的预防措施，就能够使得电力营销工作可以实现长远的发展，仅供同行交流和参考。

简介：摘要：近几年来，我国在交通运输领域的发展上取得了较好的发展成效。高铁、动车的出现，给以人类的出行提供了更加便捷的方式，更多的人会选择这些新兴的交通产物作为出行方式，在很大程度上加快了民族、国际之间的融合，使得居民出行变得更加便利。但，为了确保旅客出行环境的安全，国家相关部门要做好对列车的安全检查工作，维护列车的行车安全，保障乘坐列车出行的旅客的出行安全、在保障列车行车安全的同时也要不断提高列车上工作人员的素养，给以乘客更好的出行体验。在分析动车组制动系统的故障维修对策的过程中，我们最先要明确的一点是制动控制系统的安全运行于整个动车组的正常运行起着至关重要的作用。为确保动车组的安全行驶，在制动控制系统出现故障时，我们必须启动紧急维修措施，确保在较短的时间精确地定位到故障发生点，并找到相应的维修对策。