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1、BreakersandSwitchesLowVoltageProductsProtectionandControlonWindTurbineapplicationLowVoltageComponentsinWindTurbines1.IntroductionTheneedtoguaranteethegeneratedpowerqualityduringnetworkdisturbanceshaslatelydriventhedefinitionofnationalWindspeedisnotconstantovertimeandrapidchang
2、esofthegridcodes.Inmanycases,thecontrolofthequalityofthewindputshighdemandsonawindturbinededicatedelectricalreactivepowerflowundernormalserviceconditions,aswellasandmechanicaldesign,inordertomaximizepoweroutput.Forunderdisturbedconditions,callsforahighnumberofopera-theelectric
3、aldesignthisresultsinfrequentoperationsofthetionsfortheconnectiondevicesofthecapacitorbanksandofcontrolactuators(e.g.pitchadjustment)andrepeatedcon-thefilters.Thiscontinuousswitchingoftheelectricalcircuitsnectionanddisconnectionofthepowercircuitwithfastwarmcausestransientover-
4、voltagesonthecomponentsofthepowerupoftheconductingcomponentsasaresult.Inonshoreinstal-andcontrolcircuits,whichisalsodeterminedbythespeedatlationssubjectedtowindgusts,itiscommontoreach10-20whichtheexcitationsystemreactstothenetworkdisturbances.operationsperday.Inadditiontothis,
5、alsoenvironmentalstresses,bothme-Meanwhile,thedemandforproductioncontinuityrequireschanicalandclimatic,havetobeconsidered.Inthenacellehighreliabilityduringthewholelifeofthewindturbine.Bylowfrequencyvibrationsarecommon,causingdisplacements,exploitinglowvoltagecomponentsbasedont
6、heirmainfunc-whilethetemperaturemayvarybetween-25°Cand+50°C.Intionalcharacteristics,e.g.usingcircuit-breakersforprotectionadditionhumidity,dustandpollutionarecommonproblems.andcontactorsforswitching,maintenanceintervalscanbeThesefactorsallcauseareductionintheequipmentperform-o
7、ptimized,atthesametimetheservicecontinuityofthewindance,andthelifeexpectancyoflowvoltagecomponentsmayturbineisguaranteed,eveninextremeconditions.bereducedupto50%,comparedtowhatwouldbeachieved2BreakersandSwitches-LowVoltageProductsProtectionandControlonWindTurbineapplicationund
8、eridealconditions.Toguaranteeareliableoperationitisturbinecos
