简介:摘要:在我国低电压等级电力系统中,配电系统的中性点一般采用不接地或经消弧线圈接地两种接地方式,并且有关规程规定小电流接地系统发生单相接地故障时可以继续运行1~2h。但由于发生故障时非故障相的相电压抬升至相电压,系统容易发生相间故障,且弧光接地还会引起系统过电压。因此,故障发生后迅速准确的检测出故障线路是小电流接地保护系统的关键。本文对此进行简单介绍。
简介:摘要:在我国低电压等级电力系统中,配电系统的中性点一般采用不接地或经消弧线圈接地两种接地方式,并且有关规程规定小电流接地系统发生单相接地故障时可以继续运行1~2h。但由于发生故障时非故障相的相电压抬升至相电压,系统容易发生相间故障,且弧光接地还会引起系统过电压。因此,故障发生后迅速准确的检测出故障线路是小电流接地保护系统的关键。本文对此进行简单介绍。
简介:A3Dcontact-frictionmodelforpoundingatbridgesduringearthquakes;ANovelConceptforFaultCurrentTolerableContactors;Astudyofsurfacechangeforelectromagneticcontactor;Anexperimentalstudyabouteffectoffarinfraredradiantceramicsonefficientmethanefermentation;DynamicanalysisandsimulationofelectromagneticcontactorswithACsolenoids;DynamicsimulationofmagneticcontactorswithACsolcnoids;
简介:""""Sensorless""""Controlof4-Quadrant-RectifiersforVoltageSourceInverters(VSI);1kV4H-SiCJBSRectifiersFabricatedUsinganAIMCappedAnneal;1MHzSelf-DrivenZVSFull-BridgeConverterfor48VPowerPods;3-levelthreephasesoft-switchingPWMrectifierwithsingleauxiliaryresonantcommutatedsnubbercircuit;3-phaseconvertermodelingforunbalancedradialsystems;A100kWHigh-PerformancePWMRectifierWithaZCTSoft-SwitchingTechnique;
简介:3DSoundLocalizationBasedonAudioandVideo;A1.5-GHzI30-nmItanium2ProcessorWith6-MBOn-dieL3Cache;A1.5GHzThirdGenerationItanium2Processor;A60.5GHzmillimeterwavespreadspectrumradarandcommunicationsystemusingaCo-useantenna;Acontourcharacterextractionapproachinconjunctionwithaneuralconfidencefusiontechniqueforthesegmentationofhandwritingrecognition;ADiscussionontheClassifierProjectionSpaceforClassifierCombining;
简介:A10mW,4GHzCMOSPhase-LockedLoopwithDual-ModeTuningTechniqueandPartly-lntegratedLoopFilter;Aclean,quiet,environmentallyfriendlysnowmobile;Acomputer-controllersystemforstudyingthethermodesorptionofdeuterium;AcontrolofvehicleusingSteer-by-WiresystemwithHardware-In-the-Loop-Simulationsystem;AcorrdinatcdcontrolofSTATCOMtoimprovevoltagestability;ADesignofReflection-TypePolarizationControlDeviceUsingFerroelectricLiquidCrystals;