继电器在高压开关中的正确应用.docx

继电器在高压开关中的正确应用.docx

《继电器在高压开关中的正确应用.docx》由会员分享，可在线阅读，更多相关《继电器在高压开关中的正确应用.docx（12页珍藏版）》请在冰豆网上搜索。

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