·82·Abstracts第33卷
adopted．Afterthereformation，favorableenergy-savingeffect
wasobtained．
Keywords:excitationbrushholder;carbonbrush;energy-sav-ingreformation;generator;efficiencyenhancing
11－12－21Designfeaturesofvalvelessbypassofcondensationwaterprecisionprocessingsysteminnuclearpowerstation
WANGZhengping，WANGJianhua(ChinaHuadianEngi-neeringCorporationLimited，Beijing100035，China)
Abstract:Theprocessflowoftheconventionalcondensationwa-terprecisionprocessingsystemwasintroduced．Thedesignfea-turesofvalvelessbypassandconventionalbypasswereanalyzed．Startingfromtheangleofbypassdesigninunitthermodynamicsystemofpowerstation，thesecurityproblemoftheunitwasdis-cussed．Thedesignideaofvalvelessbypass，theoperationmodeandthekeyequipmentstypeselectionforthenuclearpowersta-tionwereexpoundedemphatically．
Keywords:nuclearpowerstation;condensationwaterprecisionprocessing;valvelessbypass;conventionalbypass;boostpump;designfeature;equipmenttypeselection
NingxiaLingwuPowerGenerationCompanyLimited，Lingwu750400，China)
Abstract:Alongwithincreaseofdesignofundergroundstruc-tureswithlargesize，thedifficultiesofdeepfoundationpitexca-vationanddewateringareincreased．Inthe2×1000MWair-cooledunitofHuadianNingxiaLingwuPowerGenerationCom-panyLimitedprojectphaseII，thedepthofthefoundationpitofwagontipperroomisabout－16．00m．Inthefoundationpitde-wateringconstructionforthisarea，theannulartubewelldewate-ringtechnologywasadopted．Aftertheimplementationofthede-wateringconstruction，thegroundwaterlevelisloweredobvious-ly;andtheconsolidationofthesoilbodyofexcavatedfoundationpitwasfavorableandcansatisfythedesignrequirement．Theimplementationofthistechnologyprovidessomeexperiencesforstructurefoundationpitdewateringinsoftsoilareawithlargerpitdepth，richgroundwaterandhighergroundwaterlevel．
Keywords:softsoil;foundationpitofstructures;simplehy-drologytest;groundwaterlevel;multi-stagedewatering;tubular
well
11－12－36smartgrid
Timesynchronizationschemefor
11－12－24Analysisandtreatmentoftheover-temperatureofhydraulicturbineguidebearing
GUOShitian(GuangdongYudeanLiuxiheHydropowerCompa-nyLimited，Conghua510956，China)
Abstract:TheovertemperatureoftheturbineguidebearingofthehydraulicgeneratorsetNo．2inLiuxiheHydropowerPlantwasintroduced．Thereasonsmaycausetheovertemperatureoftheturbineguidebearingofthehydraulicgeneratorsetwereana-lyzed．Therelevanttechnicalmeasureswereputforward，andtheovertemperatureproblemoftheturbineguidebearingwassolvedthoroughly．
Keywords:hydraulicgenerator;hydraulicturbineguidebear-ing;overtemperature;reasonanalysis;solution
11－12－28Studyonselectionofultrafilteringmembraneforseawaterdesalinization
XUXiuping，DONGZhengshuai(StateNuclearElectricPowerPlanningDesign＆ResearchInstitute，Beijing100094，China)Abstract:Atpresent，someproblemsexistindomesticalreadyrunningmembranemethodseawaterdesalinizationsystems;es-pecially，intheseawaterdesalinizationsystemsusingultrafiltra-tionaspretreatment，theproblemsaremoreserious．Dependingonthefieldtestinvestigationonseawaterultrafilteringmem-braneofapowerplantinShandong，theStateNuclearElectricPowerPlanningDesign＆ResearchInstitutehadcompletedtheperformanceverificationandcomparisonofdifferentbrandsultrafilteringmembranesofthepowerplantandobtainedtherelatedexperimentaldata，whicharehelpfulforselectionofultrafilte-ringmembrane．
Keywords:seawaterdesalinizationmembranemethod;pre-treatment;ultrafilteringmembrane;fieldtest
YANGJingyu(SchoolofElectricandInformationEngineering，ChangshaUniversityofScience＆Technology，Changsha410114，China)
Abstract:Thetimesynchronizationforthesmartgridmusthavehighaccuracyandhighsafety．Accordingtothisrequirement，atimesynchronizationschemeforsmartgridwasgiven．Inthisscheme，thepowersystemtimesynchronizationtechnology，inwhichtheBeidou/GPSdualmodetimingandtheprotocolIEEE1588arecombined，wasadopted．Accordingtothediffer-encesofoperationmodeanddesiredtimingaccuracy，differenttimesynchronizationconfigurationschemessuitableforthemas-terstationandsuitableforsubstationsweregivenrespectively．Thenthetimesynchronizationofwholesmartgridwasrealized．Keywords:smartgrid;Beidounavigationsatellitesystem;globalpositioningsystem(GPS);dualmodetiming;timesyn-chronization
11－12－39Calculationofthecriticalrotatingspeedandunbalanceresponseofsteamturbinero-tor
DINGFeng1，GUOQunlong2(1．XinjiangZhongtaiChemical
SouthCorporationLimited，Urumqi830009，China;2．Central-ElectricPowerDesignInstitute，Wuhan430071，China)
Abstract:Basedonnumericsimulation，thecriticalrotatingspeedofthesteamturbinerotorwascalculated．Theinfluenceoftheposition，inwhichtheunbalancedmassexists，onthevibra-tionamplitudeunderworkingrotatingspeedwasanalyzed;andtherelationbetweenthevibrationamplitudeandthepositionofunbalancedmasswasobtained．
Keywords:steamturbine;criticalrotatingspeed;unbalancedmass;transientresponse
11－12－31Dewateringtechnologyfordeepfoun-dationpitofwagontripperroomareainsoftsoilstratum
LIUMaoxun1，LIXiangyuan2(1．HuadianPowerInternation-alCorporationLimited，Beijing100031，China;2．Huadian
11－12－41ApplicationofQuantumPLCcontrolsystemandsoftwareIFIXinauxiliarysystemofpowerplant
XIAOJiangkai(ZhejiangHuadianEnvironmentProtectionSys-temEngineeringCompanyLimited，Hangzhou310012，China)