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    Nanjing Lianma Electric CO.,LTD. 

     Nanjing Lianma Electric CO.,LTD.    苏ICP备05038837号                                                                                                                                                                   POWER BY：300.cn

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    Our company's blowers are highly evaluated by many dry-type transformer producers in China. Blowers use the highest quality aluminium alloy profiles, firm, durable and good-looking. Blowers are compatible with 30KVA-20000KVA dry-type transformers.


    Blowers adopt superior quality stainless plates plus aluminium alloy profiles and are characterized by compact structure, high durability, high reliability and stability, low noise, great air output, even air pressure, large cooling area, excellent cooling performance, low power consumption and easy installation

     

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    In today's is given priority to with the market economy, enterprises will seek development in the developing, in the face of fierce market competition, we in line with pragmatic refinement, and continuously forge ahead, stressed that the company of "sincere, letter, refined, solid" enterprise idea, advocated "are proud of the progress, mediocre shame" spirit of enterprise, enterprise system as the platform, with team spirit as flags, focus on corporate culture, the spirit of enterprise, enterprise quality, through the system, organization, ideas, management technology, market innovation, enterprise core competitive ability. The company now has more than 50 employees.

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    PRODUCTS CENTER

    Excelsior service is preferred

    Wholeheartedly for customer service customer satisfaction is really satisfied!

    FFDD 490-155

    FFDD 690-120

    FFDD 470-155

    FFDD 490-120

    FFDD 760-110

    FFDD 850-90

    FFDD 800-80

    FFDD 600-80

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    INFORMATION CENTER

    Dry type transformer under the stack of waste, safety hazards
    Dry

    Dry type transformer under the stack of waste, safety hazards
    Drytypetransformerisusedeverywhere,becausethedrytypetransformerincontinuoususe,sothatthedrytypetransformeriswidelyused,peoplecannotleavethegoodhelper.Butdrytypetransformerintheprocessofinstallationanduseisalsoavarietyofproblems,especiallyinthecityisnotstandardizedunderthecircumstancesofthesafetyofhiddendangers,cannotbeignored,someevenwillpaythecostoflife,cannotbeunderestimated.Inhedongdistrictontheintersectionofdrytypetransformerandstackedbelowalotofwaste,theweatherishot,theroadtraffic,livingofthepopulationismore,inhotweather,electricityconsumptionislarger,undertheconditionofdrytypetransformeriswillappearallsortsofproblems,itisveryeasytofire,intheeventoffire,ignitionwastewillcausefire,theconsequenceisunimaginable. MrCheungsaidthatawomanhadcollectedasmallamountofinflammablewasteproductsaroundanoverheaddrytransformerandscrawledthewords"collectingwaste"onapoleonthesidewalkneartheleftcornerofliuweiroad,no.7,daliguroad,hedongdistrict,torecyclethewasteproducts. Yesterdayafternoon,thereportersawonthescene,a"sun110710KVcottondormitory"wordssignontheairdrytransformersetonthesidewalk.Thedrytransformerissurroundedbycardboardboxes,andasmallnumberofplasticbottles,woodenboxes,plasticfoamandotheritems.Theseflammablegoodsareseparatedatthebaseofthedrytransformerbyonlyonemeter.Awomansawsomeonehere,immediatelyasked:"doyouhavescrapforsale?"Hesaidherecycledtheitemsstackedaroundthedry-typetransformerandcollectedthemonthesidewalkforeasytransportationandarrangement.Askedifthepilewassafeundera10-kvdrytransformer,hesaidtherehadbeennoaccident. Stategridtianjinchengdongcompanytaskpersonnelintroduced,accordingtothe"powerequipmentmaintenanceregulationsimplementationrules"rules,atalllevelsofvoltageconductorsidelineinthecalculationofthemostbreezy-biasedwire,10KVsafeintervalis1.5meters.Nounitorgroupshallpileuparticlesthataffectsafepowersupplyinthepowerlinemaintenancearea.Itisillegaltopileupinflammablesundriesunderoverheadpowerequipment,andtherearecertainhiddendangersofsafety.Powersectorofficialssaidtheywouldcontacttheterritorialcomprehensivelawenforcementpersonnelassoonaspossibletoeliminatethishiddendanger. Ihoperelevantdepartmentscanmovetheinstallationlocationofthedrytypetransformer,andadvisethewomannottoputwasteproductsontheroadside,sothatitwillreducetheoccurrenceofsafetyrisks,peoplewillbemoresafe!
    The difference between dry-type transformer and oil-immersed transformer
    The

    The difference between dry-type transformer and oil-immersed transformer
    Whatisthedifferencebetweendry-typetransformerandoil-immersedtransformer? Definition: Oil-immersedtransformer:dependingonoilascoolingmedium,suchasoil-immersedself-cooling,oil-immersedair-cooling,oil-immersedwater-coolingandforcedoilcirculation,etc.Generallyusedinthermalpowerplantboosterstationofthemaintransformer,variableratioof20KV/500KV,or20KV/220KV,generallyusedinpowerplantstodrivetheirownload(suchascoalmill,fan,fan,circulationpump,etc.)thefactorytransformerisalsooil-immersedtransformer,itsvariableratiois20KV/6KV.Ratedvoltageofoiltypetransformeris3-35kv. Drytypetransformer:relyonairconvectionforcooling,generallyusedinofficebuildings,urbanbuildings,halls,pavilions,highgradeareassuchaslighting,electroniclinesandothersmallandmedium-sizedcapacitytransformers.Variableratioof10000V/400Visusedforloadwithratedvoltageof380Vand220V. Thedifferencebetween: Oil-immersedtransformer: 1,oiltransformercanonlyseethetransformershell; 2.Porcelainbushingisusedformostoil-immersedtransformers; 3.Oil-immersedtransformercanachievefullcapacityfromsmalltolarge,andallvoltagelevelscanbeachieved; 4,oil-immersedtransformerinsulationoilinsulation,insulationoilinthetransformerinternalcirculationofthecoilgeneratedbythetropicaltothetransformerradiator(chip)forheatdissipation. 5,oil-immersedtransformerduetothe"accident"mayhaveoilspurtorleakage,resultinginfire,mostoftheapplicationintheoutdoor. 6.Thepriceofoil-immersedtransformershouldbelow; 7,generaloil-immersedtransformerisfromwood,cotton,paper,fiberandothernaturalfabrics,onthebasisoftheacetatefiberandpolyesteramineoftextiles,andiseasytobedecomposedandlowmeltingpointplastic,workinmineraloil,ortheoilresincompositeresinimpregnated,itslimitworkingtemperatureis105℃. Drytypetransformer: 1.Fromtheappearance,thedrytypetransformercandirectlyseetheironcoreandcoil; 2,leadtheformisdifferent,drytransformersmostlyusesiliconerubbersleeve; 3,capacityandvoltagearedifferent,drytransformerisgenerallysuitablefordistribution,capacityismostlybelow1600KVA,voltageisbelow10KV; 4,insulationandheatdissipationisdifferent,drytransformersaregenerallyinsulatedwithresin,relyonnaturalaircooling; 5.Intermsofapplicationplace,drytypetransformerismostlyusedinplacesrequiring"firepreventionandexplosionprotection".Generally,itiseasytobeusedinlargebuildingsandhigh-risebuildings. 6,thecostisdifferent,forthesamecapacitytransformer,drytransformerprocurementpriceishigh; 7,drytypetransformercommonlyusedclassHinsulationmaterials,withinorganicmaterialforreinforcementofmicaproducts,thickeningoftheFmaterial,compositemica,organicsiliconmicaproducts,siliconpaint,siliconerubberpolyimidecompositeglasscloth,compositemembrane,polyimidecoating,etc.,itslimitworkingtemperatureis180℃.
    What do you know about dry transformer overload?
    What

    What do you know about dry transformer overload?
    Transformershavetheirownfixedcapacity,whentheloadexceedsthiscapacityisoverload.Thetransformercapacityisfixed,andthevoltageoftheoriginalsideandtheauxiliarysideisalsofixed.Then,theratedcurrentoftheoriginalsideandtheauxiliarysideisthemaximumcurrentthatthistransformercancarry.Withtheincreaseofload,thecurrentoftheoriginalsideandthesecondarysidewillalsoincreasecorrespondingly.Whenthecurrentvalueexceedstheratedcurrent,itisoverload. Forexample,fora10kv/400vtransformerwithacapacityof1000KVA,theratedcurrentoftheprimarysideandthesecondarysideis58Aand1440Arespectively.Whenthesecondarysidecurrentexceeds1440,theprimarysidecurrentmustalsoexceed58.It'soverloaded. Whatisthemaincauseoftransformeroverload? (1)themainfeatureofmechanicaloverloadisthemotorheat,andcanbefoundfromthescreentoreadtherunningcurrent. (2)three-phasevoltageimbalancecausestheoperationcurrentofaphaseistoolarge,resultinginoverloadtrip,whichischaracterizedbythemotorheatimbalance,readingtheoperationcurrentfromthescreenmaynotbefound(becausethescreenonlyshowsaphasecurrent). (3),misoperationofthefrequencyconverterinternalcurrentdetectionpartofthefault,detectedthecurrentsignalistoolarge,resultingintripping. Transformeroverloadcapacityandtime Thestaffinthedistributionroomshallmonitortheoperationofeachtransformerinrealtime.Ifthetransformerisfoundtobeoverloaded,itshallcloselyobservetheoverloadandtheoperationtime.Iftheoverloadexceedsthefollowingprovisions,itshallimmediatelynotifytheproductiondepartmenttotakenecessaryregulatorymeasurestoensurethesafetyofthetransformerandthepowergrid. Analysisofoverloadcapacityofdrytypetransformer Theoverloadcapacityofdry-typetransformerisrelatedtotheenvironmentaltemperature,theloadconditionbeforeoverload(initialload),theinsulationandheatdissipationconditionoftransformerandtheheatingtimeconstant,etc.Ifnecessary,theover-loadcurveofdry-typetransformercanbeobtainedfromthemanufacturer. Atpresent,theannualoutputofresininsulateddry-typetransformerinChinahasreached10000MVA,makingitoneofthecountrieswiththelargestproductionandsalesvolumeofdry-typetransformerintheworld.WiththepopularizationandapplicationofSC(B)9serieswithlownoise(noiseofdistributiontransformerbelow2500kVAhasbeencontrolledwithin50dB)andenergy-saving(no-loadlossreducedby25%),theperformanceindexandmanufacturingtechnologyofdrytypetransformerinChinahavereachedtheworldadvancedlevel. Withthepopularizationandapplicationofdry-typetransformer,itsmanufacturingtechnologyhasalsobeengreatlydeveloped.Itcanbepredictedthatthedry-typetransformerwillbefurtherdevelopedinthefollowingaspectsinthefuture. (1)energysavingandlownoise:withtheintroductionofnewlow-consumptionsiliconsteelsheet,foilwindingstructure,ladderironcorejoint,environmentalprotectionrequirements,in-depthnoiseresearch,andcomputeroptimizationdesignandothernewmaterials,newprocesses,newtechnologies,willmakethefuturedrytransformermoreenergysavingandmorequiet. (2)highreliability:improvingproductqualityandreliabilitywillbepeople'sunremittingpursuit. (3)environmentalprotectioncharacteristiccertification:basedontheEuropeanstandardHD464,theresearchandcertificationoftheweatherresistance(CO,C1,C2),environmentresistance(E0,E1,E2)andfireresistance(F0,F1,F2)characteristicsofdrytypetransformersarecarriedout. (4)largecapacity:fromthedrytypetransformermainlycomposedof50-2500kvadistributiontransformer,tothe10,000-20000kva/35kVpowertransformer,withthecontinuousincreaseofurbanpowerload,urbannetworkregionalsubstationsaremoreandmoredeepintotheurbancenter,residentialareas,largefactoriesandminesandotherloadcenters,35kVlargecapacitypowersupplytransformerwillbewidelyusedinthecommunitycenter. (5)multi-functionalcombination:itdevelopsfromasingletransformertoamulti-functionalcombinationtransformerwithaircooling,protectiveshell,temperaturecomputerinterface,zero-sequencetransformer,powermetering,closedbusandsideoutlet. (6)multi-fielddevelopment:fromdistributiontransformer,topowerstationtransformer,excitationtransformer,subwaytractionrectifiertransformer,largecurrentfurnacetransformer,nuclearpowerstation,Marineandoilproductionplatformandotherspecialtransformerandmulti-purposedevelopment.Amongthem,thedry-typetractiontransformerusedinurbansubwayandrailtransithasthreelevelsofvoltageof10,20and35kV,andcapacityof800,2500and3300kVA.Inordertoreduceharmonicpollution,itdevelopsfrom12-pulsewaverectification.
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