继电器在高压开关中的正确应用.docx
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继电器在高压开关中的正确应用.docx
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继电器在高压开关中的正确应用
Page1.Relaysinhighvoltageswitchthecorrectapplication(继电器在高压开关中的正确运用)
1.Englishtext
Firstly,almostAssyria
Currentuseofhvswitchgearquadraticsystembyamultitudeofrelays,morecontactsauxiliaryswitchandtravelswitchandcomposedpressureswitchcomponents,includingrelaysclassinproportionoftheabout70%,facingthecomplexcomplexrelaysproducts,howtochoose,correctlyuse,isthesystemdevelopment,designpersonnelcloseattentionandshouldgiveprioritytotheactualproblems,especiallyashvswitchgearquadraticcontrolsection,useplentyofrelays,initsoperationalsohasitsuniqueparticularity,selectionofwillpower,directlyrelatedtothesubstationequipmentreliablesafetyruns,incaseofaccidentwillbeparticularlysevere,sotoachievereasonableselection,correctlyuse,wemustfullyresearchanalysissystemofpracticalapplicationconditionandactualtechnicalparametersoftheproposedrequirements,rightlychosenrelaysproductsmustachievetechnicalperformance,thewholesystemdesign,andonthebasisoftheimportanceofthewholesystem,reliability,byuseofenvironmentalconditionsandcostfactorssuchascomprehensiveconsiderationoftherationalchoiceofrelays.
Secondly,touseenvironmentalconditionsofchoice
Climatestresselements,ismainlyreferstotemperature,humidity,airpressure(altitude),coastalatmospheric(saltfogcorrosion),dustpollution,chemicalgasandelectromagneticinterferencefactors,consideringthehighvoltageswitchinmanybadworkingconditions,especiallyaswideoperatingequipmentrunninghighvoltagecircuitbreakerinoutdoorenvironment,worksituationworse,andundertakestheparticularityandreliableoperationsystemkeypartsmustchoosethosewhohavehighaltitude,strongresistanceofwholesealingproducts,becauseonlyfullsealofrelaywillhasgoodlong-termtoleranceatrociousenvironmentalperformance,excellentelectricalcontactisstable,reliableswitchingloadability.
1.Effectoftemperatureontherelay
Relaysareafraidofheatcomponents,hightemperaturecanacceleraterelaysinternalplasticsandinsulatingmaterialsofaging,contactoxidationcorrosionandextinguisharcdifficulties,electriccomponentstechnicalparameters,thedecayreliabilityisreduced,duetothehighvoltageswitchinnerisequippedwithfloodingboomandinsulationofheater,therefore,inthewholesystemdesignwillnotrelaynearfloodingboomandinsulationheatersandshouldremaingoodventilatedcondition.Althoughrelayisafraidofheatcomponents,butlowtemperaturealsocannotignore,lowtemperaturecanmakecontactscoldnienactionintensifies,contactsthesurfaceupthedew,manymanufacturersofrelayshowsthatthelowesttemperaturefora25℃,butthehighvoltageswitchapplicationinalpineregionalsobeabsentafew,becausethisproposalsizednoteonservative,avoidrelaysinlowtemperatureandunreliable,appropriateinalpineregionincreasedheaters,ensurerelayatlowtemperaturesandreliableoperation,ensurethestableoperationofthesystem.
2.Depressionofrelays
Intheeffectofdepressionconditions,therelayoftheradiationconditionbecomesworse,coiltemperaturerise,maketherelaygivensuctionclose,releaseparameterschange,affectthenormalwork,depressionrelaystillcanmaketherelayinsulationresistanceisreduced,contactsextinguisharcdifficulties,easytomakecontactsburn,thereliabilityofthefusioninfluencerelays,aimingatdepressionconditions,theproposalUSESmachinesealingmethod.
3.Theinfluenceofmechanicalstressofrelays
Mainlyreferstothevibrationandimpact,collisionstresselementsforthecontrolsystemofseismicstressresistanteffect,aswellasmechanicalstress,thehighvoltageswitchcircuitbreakerinvibrationandpointsoffthevibrationscausedoperationofrelaysmoreinfluence,shouldchoosethebitinstitutionsinbalance,askforelectromagneticrelaysreedrelaysarehangbeamstructure,theinherentfrequencylow,oscillationandimpactcancauseresonance,causetherelaycontactpressuredrops,easytoproduceinstantdisconnectorcontactsappearjitter,affectthereliabilityoftherelay,theproposalinthedesignmakeusevibration-proofmeasurestopreventproduceresonance.
4.Theinfluenceofinsulationvoltagetorelay
Thesealedpressureorsealedrelaysderivationofthedistalexposedlong-termexposuretodust,moistureinsulatorfactors,whichcausesthepollutionofdielectricstrength,itisapttocausetheinsulationdecline,sothebreakdownfailureshouldpayattentiontothefollowing:
(1)enoughcreepagedistance:
generalrequirementnotlessthan3mm,
(2)enoughinsulationintensity:
noelectricalconnectionbetweentheconductorisgreaterthanAC2000VfacecontactsbetweenmorethanAC1000V.(3)long-termtoleranceclimatestressability:
coilmouldproofbroken,electricalinsulationresistancelevellong-termstableandreliable.
5.Contactoutput(in)theinfluenceofpickupcircuitload
Mainlyreferstocontactloadproperties,suchas:
lightload,motorload,inductors,contactor(relays)coil,resistancesexload,etc;Contactloadmeasure(open-circuitvoltagevalue,closed-circuitcurrentvalue),belike:
lowlevelload,drycircuitload,lowcurrentload,largecurrentload,etc.Anyautomationequipmentmustbepracticalidentificationrequiredforpracticalloadproperties,loadvector-valuedsize,selectingproperrelaysproductparticularlyimportant.Relayfailureorreliableunreliable,mainlyreferstothecontactscancompleteallprovisionsofswitchingcircuitfunction.Iftheactualloadswitchwithselectedrelaysprovisionsofswitchingloadinconsistencies,reliabilitywillbementioned.
Thirdly,useofrelaysshouldpayattentiontothespecialproblemsandanalysis
1.Abouthermeticrelaywiththehermeticrelaypartofengineeringandtechnicalpersonnelthinkthatthesealingproductsactionintuitive,failureanalysisconvenientwhilewholesealingproductsactionprocessofinvisible'tfathom,subjectivedeterminationnotsealingproductsthanwholesealingproductsmorereliable,thiskindofintuitionanddeterminationofconceptionisverywrong.Thehermeticrelayadvantageisusedmoreclapwell-formedbitandsimpleinstructure,manufactureprocessissimpleandconvenientinstallationandeasymaintenance,workingcondition,intuitive,andfacilitatefailureanalysis,cheapprice.Themajordisadvantageistheworkingreliabilityofuseenvironment(climatestress,mechanicalstress)changethesensitivityofthestrong,long-termtoleranceclimaticconditionspropertiesincreasedovertimeissusceptibletoenvironmentalconditionspollution,injury,electricalcontactstability,poorreliability,coileasytogenerateelectricitydamporimpuritypollutioncorrosion,mildewandfailure.Allthehermeticrelayadvantageisusedmorebalancedrotarybitandtotally-sealinginstitutionsisolationexternalclimatestress,resistanttobadenvironmentfineperformance,thecontactselectricalcontactperformanceisstableandreliable,coilcorrosion,mildew,andlong-termreliableexcellentperformance,defectiscomplexstructure,manufacturingprocessescomplex,failureanalysisdifficulties,itselfcannotrepairafterrepeateduse,costpriceshigh.Therefore,fromthelong-termclimatestressresistanceperformanceofatrociousenvironmentalperformanceandelectricalcontactstablereliabilityconsideration,allthehermeticrelaysuperiortothehermeticrelay,especiallyforhighvoltageswitchusedinrelaysproducts,shouldchoosetotally-sealingrelays,socanadapttopowerautomaticcontrol,long-termstableparticularityrequest.
2.Relaycontactsofparallelandseriesrelaycontactsparalleluseddoesn'timproveitsloadcurrentrelay,becausemanygroupsofthecontact'sactionisabsolutelynotsimultaneouslymovement,namelyfirstconnectwiththegroup1contactsfirstswitchenhancedload,andparallelothercontactshaven'taction,itiseasytomakecontactsdamagewithoutcontactorweldedwhichcouldnotdisconnect,contactsto"break"parallelerrorcanbereducedfailurerate,butto"stick"mistakes,bycontrast,dueto"break"contactsmistakesasthemainfailuremodes,itshallbesuretoimprovereliabilityinparallel,canuseinkeyparts.Forexample:
inhighvoltagecircuitbreakerimplementsthreeextremelyelectricallinkage,usingrelayactiontodrive3normallyopencontactsclosed,thenrespectivelydriven3unipolarelectromagnetsfinishpointsoffoperation,atthattimerelaynamelypointsoffthreepairsofrelaysnormallyopencontactsMay21groupsinparallel,playedakeyrole,seefigure1.Usetheworkingvoltageofnothigherthanrelayscoilmaximumworkingvoltage,alsodonotlessthan90%oftheratedvoltage,otherwiseyouwillendangercoillifeandreliabilityinuse.
Contactscanimproveitsloadvoltageseries,improvemultiplesnamelyforthetandemcontactsthenumberofgroups,contactsintheseriesof"stick"mistakescanincreaseitsreliability,butto"break"mistakesopposite.Forexample:
somehighvoltagecircuitbreakerpointsclosebrakeoperatingcircuitwillofauxiliaryswitchcontactsparallelorseries,isaccordingtotheoperationloadcurrenttodecide.Inordertooperatemorereliable,suggestionwillauxiliaryswitchcontactsareparallel,ensuretheactionofreliable,playedakeyprotection,seefigure3,asshowninfigure3paralleltypeSuggestions.
3.Relaycontactsthecorrectconnection
(1)Inpowerautomationcontroloperation,trytomoveclosecontacts,lesswithdynamicbreakcontacts,namelytherelaycontactstheconnection,shouldtrytousemoremoveclosecontactsconnection.Us
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