Taw qhia
Lub tshuab hluav taws xob tam sim no (CT) yog tsim los tsim cov khoom loj loj tam sim no raws li qhov me me thib ob tam sim no uas tuaj yeem ntsuas los ntawm meters, saib xyuas cov cuab yeej, lossis siv los ntawm kev tiv thaiv relays. Ib qho ntawm cov yam ntxwv tseem ceeb tshaj plaws ntawm CT yog nws qhov tseeb vim tias txawm tias qhov ntsuas me me tuaj yeem cuam tshuam rau kev ntsuas lub zog, kev saib xyuas, thiab kev tiv thaiv kev ua haujlwm.
Txawm li cas los xij, qhov tseeb ntawm qhov tam sim no transformer tsis yog sawv cev los ntawm ib feem pua ntawm universal. Nws nyob ntawm CT cov chav kawm raug, qhov piv txwv, lub nra, kev khiav hauj lwm tam sim no, zaus, kub, cov yam ntxwv sib nqus, thiab daim ntawv thov.
Kev nkag siab txog cov xwm txheej no yog qhov tseem ceeb thaum xaiv lub tshuab hluav taws xob tam sim no rau kev ntsuas hluav taws xob, ntsuas hluav taws xob, khoom siv hluav taws xob, lossis kev tiv thaiv hluav taws xob.
Tam sim no Transformer Accuracy txhais li cas?
CT qhov tseeb piav qhia qhov ze li cas qhov thib ob tam sim no sib raug rau tus nqi xav tau raws li qhov hloov pauv qhov ntsuas tam sim no.
Piv txwv li, piv txwv li CT muaj qhov sib piv ntawm 500/5A. Qhov zoo tshaj plaws, thaum thawj qhov tam sim no yog 500A, qhov thib ob tam sim no yuav tsum yog 5A.
Hauv CT tiag tiag, qhov tseeb thib ob tam sim no yuav txawv me ntsis ntawm tus nqi zoo tagnrho. Qhov txawv yog muaj feem xyuam rau lub transformer qhov piv ntawm qhov yuam kev thiab theem hloov chaw.
Yog li, CT qhov tseeb dua ua rau qhov thib ob tam sim no uas ze ze sawv cev rau qhov tseem ceeb tam sim no raws li nws cov kev ua haujlwm tau teev tseg.
Qhov tseeb Class ntawm Transformer tam sim no
Cov chav kawm raug yog ib qho ntawm cov ntsiab lus tseem ceeb siv los piav txog CT ntsuas kev ua tau zoo.
Rau metering daim ntawv thov, CTs yuav raug tsim nrog cov chav kawm raug sib txawv nyob ntawm qhov yuav tsum tau ntsuas precision. Cov piv txwv muaj xws li 0.1, 0.2, 0.5, thiab 1.0 chav kawm, txawm hais tias cov chav kawm muaj tseeb nyob ntawm tus qauv siv thiab cov chaw tsim khoom.
Qhov tseeb ntawm tus lej qis dua- cov nqi hauv chav kawm feem ntau qhia tias yuav tsum muaj qhov tseeb nruj dua nyob rau hauv cov xwm txheej xeem.
Piv txwv li, qhov siab - ntsuas qhov tseeb CT tej zaum yuav raug xaiv rau cov ntawv thov uas qhov ntsuas lub zog yog qhov tseem ceeb tshwj xeeb.
Kev tiv thaiv CTs siv cov kev faib ua haujlwm sib txawv vim tias lawv lub hom phiaj tseem ceeb yog muab cov teeb liab tsim nyog tam sim no rau cov cuab yeej tiv thaiv, tshwj xeeb tshaj yog thaum muaj kev txawv txav lossis ua txhaum.
Ratio yuam kev
Ratio yuam kev yog ib qho tseem ceeb ntawm CT qhov tseeb.
Qhov zoo tshaj plaws, qhov tseem ceeb ntawm - rau - theem nrab kev sib raug zoo tam sim no yuav nyob twj ywm raws nraim qhov sib npaug ntawm qhov ntsuas kev hloov pauv.
Hauv kev xyaum, qhov kev sib raug zoo tiag tiag tuaj yeem sib txawv me ntsis vim yog cov yam ntxwv sib nqus ntawm cov tub ntxhais thiab cov excitation tam sim no xav tau los ntawm CT.
Qhov kev sib txawv no yog hu ua piv txwv yuam kev.
Rau daim ntawv thov kev ntsuas, kev tswj qhov kev ua yuam kev yog qhov tseem ceeb vim tias CT tso zis yog siv los xam cov tam sim no, lub zog, lub zog, lossis lwm yam khoom siv hluav taws xob.
Phase Displacement
CT qhov tseeb kuj raug cuam tshuam los ntawm theem hloov chaw.
Nyob rau hauv ib qho zoo tagnrho transformer, lub hauv paus thiab theem nrab kev sib raug zoo tam sim no yuav muaj cov theem kev sib raug zoo. Hauv qhov tseeb CT, qhov thib ob tam sim no tuaj yeem muaj qhov sib txawv me me uas tshwm sim los ntawm cov yam ntxwv zoo siab thiab kev coj tus cwj pwm sib nqus ntawm cov tub ntxhais.
Kev hloov pauv theem tuaj yeem dhau los ua qhov tseem ceeb thaum CT siv rau kev ntsuas lub zog thiab lub zog vim tias kev suav fais fab nyob ntawm qhov kev sib raug zoo ntawm qhov voltage thiab tam sim no.
Yog li ntawd, qhov tseeb metering CTs yog tsim los tswj ob qho tib si kev ua yuam kev thiab theem hloov chaw.
Yuav ua li cas Burden cuam tshuam rau CT Accuracy
Burden yog ib qho tseem ceeb tshaj plaws uas cuam tshuam rau CT qhov tseeb.
Secondary Circuit Court tej zaum yuav muaj xws li:
* Zog ntsuas
* Ammeter inputs
* Kev tiv thaiv relays
* Terminal blocks
* Txuas cov xov hlau
* Lwm yam khoom siv thib ob
Tag nrho cov no pab txhawb rau lub nra uas pom los ntawm CT theem nrab.
Yog tias lub nra tiag tiag txawv ntawm cov xwm txheej raws li CT qhov tseeb tau teev tseg, qhov kev ntsuas kev ntsuas yuav hloov pauv.
Lub nra hnyav tuaj yeem ua rau qhov voltage xav tau los ntawm CT theem nrab thiab cuam tshuam rau nws cov kev ua haujlwm sib nqus.
Yog li, CT yuav tsum raug xaiv nrog lub nra hnyav rau kev ua tiav theem nrab.
Qhov cuam tshuam ntawm Thawj Tam Sim No
CT qhov tseeb kuj tuaj yeem sib txawv nyob ntawm qhov tseeb tam sim no.
CT tej zaum yuav tsis muab qhov tseeb tib yam ntawm qhov tsis tshua muaj tam sim no, ib txwm ua haujlwm tam sim no, thiab tam sim no siab.
Qhov no yog qhov tseem ceeb tshwj xeeb hauv kev siv hluav taws xob- ntsuas ntsuas vim tias cov khoom siv hluav taws xob tuaj yeem hloov pauv txhua hnub.
Piv txwv li, ib qho chaw ua lag luam yuav muaj qhov sib txawv loj ntawm nws qhov tsawg kawg nkaus thaum hmo ntuj thiab nws cov khoom siv ntau tshaj plaws.
Xaiv qhov sib piv CT uas tsim nyog yuav pab xyuas kom meej tias qhov kev ua haujlwm tam sim no tseem nyob hauv qhov kev ntsuas tsim nyog.
Cov nyhuv ntawm Saturation
Sib nqus saturation yog lwm yam tseem ceeb cuam tshuam rau CT kev ua haujlwm.
Thaum cov tub ntxhais sib nqus mus txog qhov sib nqus, kev sib raug zoo ntawm thawj tam sim no thiab theem nrab tam sim no yuav tsis nyob twj ywm proportional.
Thaum lub sij hawm siab - tej yam kev txhaum tam sim no, kev tiv thaiv CTs tuaj yeem ua rau muaj zog magnetic excitation.
Yog tias CT saturates loj heev, qhov thib ob waveform tuaj yeem hloov pauv thiab kev tiv thaiv relay yuav tau txais qhov tsis raug sawv cev ntawm thawj qhov tam sim no.
Vim li no, kev tiv thaiv CTs yuav tsum raug xaiv raws li qhov yuav tsum tau muaj ntawm cov txheej txheem tiv thaiv, suav nrog cov yam ntxwv tsim nyog saturation thiab excitation.
Kub thiab Environmental Conditions
Kub kuj tuaj yeem cuam tshuam rau CT kev ua haujlwm.
Kev hloov pauv ntawm qhov kub thiab txias tuaj yeem cuam tshuam qhov hluav taws xob tsis kam ntawm winding thiab cov yam ntxwv sib nqus ntawm cov khoom siv hauv CT.
Ib puag ncig tej yam kev mob xws li av noo, altitude, muaj kuab paug, thiab installation tej yam kev mob kuj yuav cuam tshuam rau tag nrho cov transformer kev ua tau zoo.
Rau cov ntawv thov xav tau, CT yuav tsum raug xaiv raws li qhov chaw ua haujlwm tiag tiag thiab cov chaw tsim khoom tau teev tseg.
Metering Accuracy vs Protection Performance
Nws yog ib qho tseem ceeb kom paub qhov txawv ntawm kev ntsuas qhov tseeb thiab kev tiv thaiv kev ua haujlwm.
Kev ntsuas CT feem ntau yog tsim los muab cov ntaub ntawv raug tam sim no rau kev ntsuas thiab tswj hluav taws xob.
Ib qho kev tiv thaiv CT, ntawm qhov tod tes, yog tsim los muab cov ntaub ntawv tseem ceeb rau cov cuab yeej tiv thaiv nyob rau hauv cov xwm txheej txawv txav.
CT uas zoo heev rau kev ntsuas lub zog tsis yog qhov kev xaiv zoo tshaj plaws rau daim ntawv thov kev tiv thaiv.
Cov chav kawm raug thiab cov yam ntxwv ua tau zoo yuav tsum ua kom zoo ib yam li daim ntawv thov.
Yuav ua li cas txhim kho tam sim no Transformer raug
Ob peb kauj ruam tuaj yeem pab tswj kev ntsuas CT zoo:
1. Xaiv qhov tseeb CT piv.
2. Xaiv cov chav kawm kom raug.
3. Ua kom lub nra hnyav rau qhov tseeb thib ob Circuit Court.
4. Siv cov kab txuas txuas ntxiv uas tsim nyog thiab qhov ntev.
5. Txheeb xyuas qhov polarity thiab xaim kom zoo.
6. Zam kev sib txuas tsis tsim nyog.
7. Txhim kho CT raws li cov chaw tsim khoom cov lus qhia.
8. Ua qhov kev sim thiab ntsuas qhov tsim nyog.
9. Tshawb xyuas cov cim qhia ntawm overheating lossis rwb thaiv tsev teeb meem.
10. Hloov CTs puas lossis degraded thaum tsim nyog.
Kev txhim kho kom raug tsuas yog ib qho tseem ceeb xws li xaiv lub siab - zoo CT.
Yuav Ua Li Cas CT Accuracy Test?
CT qhov tseeb tuaj yeem txheeb xyuas tau siv cov cuab yeej kuaj thiab cov txheej txheem tsim nyog.
Ib qho piv txwv piv rau qhov tseeb thawj thiab theem nrab kev sib raug zoo tam sim no nrog rau qhov ntsuas qhov hloov pauv.
Lwm qhov kev ntsuam xyuas tuaj yeem ntsuas qhov kev ua yuam kev, theem kev hloov pauv, cov yam ntxwv ntawm kev zoo siab, kev tiv thaiv kab mob, thiab lwm yam kev ua tau zoo nyob ntawm CT hom thiab daim ntawv thov.
Kev ntsuam xyuas yuav tsum tau ua los ntawm cov neeg ua haujlwm tsim nyog siv cov txheej txheem tsim nyog thiab cov khoom siv, tshwj xeeb tshaj yog rau nruab nrab - thiab siab -voltage installations.
Xaus
Qhov tseeb ntawm lub transformer tam sim no nyob ntawm ntau dua li nws teev qhov tseeb hauv chav kawm. CT ratio, lub nra, thawj tam sim no, saturation, zaus, kub, magnetic yam ntxwv, installation tej yam kev mob, thiab daim ntawv thov yuav tsum tau tag nrho cov muaj feem xyuam rau kev ua tau zoo.
Rau kev ntsuas hluav taws xob thiab ntsuas hluav taws xob, chav ntsuas ntsuas qhov tseeb raug tsim nyog thiab lub nra hnyav yog qhov tseem ceeb.
Rau kev tiv thaiv daim ntawv thov, saturation thiab excitation yam ntxwv tseem ceeb heev.
Los ntawm kev xaiv qhov tseeb CT specifications thiab txhim kho, kuaj, thiab tswj lub transformer kom zoo, cov neeg siv yuav tau txais kev ntsuas tam sim no txhim khu kev qha thiab ntseeg tau hluav taws xob - system kev ua tau zoo.