Nkag siab CT Ratio hauv Transformers: Vim Li Cas Nws Tseem Ceeb
(Nyem daim duab kom paub ntxiv.)
Yog tias koj tab tom cuam tshuam nrog lub tshuab hluav taws xob, koj twb paub ib yam kom paub meej: kev ntsuas tam sim no yuav tsum ntseeg tau. Thiab thaum nws los ntsuas cov dej ntws siab nyab xeeb, aTam sim no transformer (CT)feem ntau yog qhov mus- rau kev daws.
Ib qho ntawm cov ntsiab lus CT loj tshaj plaws uas koj yuav pom hauv daim ntawv thov transformer thiab switchgear yog qhov piv ntawm ct -thiab ncaj ncees, nws tuaj yeem ua lossis tawg ob qho tib si ntsuas thiab kev tiv thaiv kev ua haujlwm.
CT Ratio yog dab tsi?
Qhov piv txwv ct qhia koj li cas CT ntsuas tam sim no los ntawm thawj sab (siab- kab tam sim no) mus rau sab thib ob (qhov kev nyab xeeb tam sim no pub mis / relays).
Hauv feem ntau tiag tiag - kev teeb tsa ntiaj teb, qhov thib ob tam sim no yog tus qauv ntawm ob qho tib si5Alos yog1A.
Piv txwv li, CT ntsuas200:5txhais tau tias:
200 Antws hauv thawj tus neeg xyuas pib
cov CT outputs5 Anyob rau theem nrab
Qhov no yog li cas meters thiab relays tuaj yeem ntsuas cov dej ntws loj yam tsis tau tuav cov txiaj ntsig siab ncaj qha.
Ib txoj hauv kev yooj yim los qhia nws yog:
CT Ratio=Thawj Tam Sim No ÷ Secondary Current
Yog li yog- lej yog ncaj nraim, tab sis xaiv qhov sib piv tsis yog ib yam rau "tis."
Feem ntau CT Ratios siv hauv Transformer Applications
Qhov tseeb ct piv koj xav tau nyob ntawm lub transformer kev khiav hauj lwm tam sim no thiab qhov koj siv CT rau (metering, tiv thaiv, saib xyuas, lossis tag nrho peb).
Nov yog qee qhov piv txwv uas koj yuav pom feem ntau:
Cov kws kho tsheb feem ntau yog tsom rau CT piv uas sib tw ua haujlwm uas xav tau, thaum tseem muab qee lub taub hau rau kev thauj khoom ib ntus. Vim hais tias nyob rau hauv lub ntiaj teb no tiag tiag, loads tsis tas yuav nyob twj ywm zoo kawg nkaus "ib txwm."
Vim li cas CT Ratio tseem ceeb (tsis yog daim ntawv lo xwb)
Thaum xaiv ct piv tau raug, koj tau txais ib pawg ntawm cov txiaj ntsig zoo:
1) Kev ntsuas qhov tseeb
Cov ntsuas hluav taws xob nyob ntawm CT nyeem. Yog tias qhov sib piv CT tsis raug, koj qhov kev ntsuas tuaj yeem raug tshem tawm - ua rau muaj kev ceeb toom tsis raug (thiab yog, qee zaum teeb meem them nqi ib yam nkaus).
2) Txhim khu kev tiv thaiv
Kev tiv thaiv relays siv CT teeb liab los kuaj xyuas qhov tsis zoo xws li luv luv lossis overloads. Yog tias qhov sib piv CT tsis phim lub kaw lus kom raug, lub relay yuav tsis teb kom raug thaum nws tseem ceeb tshaj plaws.
3) Kev soj ntsuam zoo dua thiab kev nkag siab txog qhov system
Niaj hnub nimno transformer saib xyuas tshuab siv CT cov ntaub ntawv los taug qab cov qauv thauj khoom thiab kev ua haujlwm. Ib qho kev xaiv CT kom zoo pab ua kom cov ntaub ntawv muaj kev ntseeg siab, tsis yog "ze txaus."
Tej yam yuav tsum tau xav txog thaum xaiv CT Ratio
Ua ntej xauv hauv qhov sib piv CT, nws yuav pab xav txog tej yam xws li:
Maximum xav tau transformer load tam sim no
Seb lub load yuav loj hlob yav tom ntej
Yuav tsum tau metering raug chav kawm
Kev tiv thaiv relay xav tau
Cia siab tias luv luv - theem tam sim no hauv Circuit Court
Ib qho "txoj cai ntawm tus ntiv tes xoo" engineers sim ua raws li: tsis txhob xaiv CT piv uas yog qhov loj dua qhov koj ib txwm siv. Yog hais tias lub CT yog me me loaded feem ntau ntawm lub sij hawm, qhov tseeb yuav poob.
Yuav Ua Li Cas Yog Qhov Tsis Zoo CT Ratio?
Kev siv qhov tsis raug ct piv tuaj yeem ua rau mob taub hau ua haujlwm tiag tiag:
Oversized CTsyuav tsis ntsuas qhov tseeb ntawm cov theem tam sim no.
Undersized CTstuaj yeem saturate thaum lub sijhawm ua txhaum.
Thiab CT saturation yog qhov loj heev -nws cuam tshuam cov teeb liab thib ob tam sim no. Thaum qhov ntawd tshwm sim, kev tiv thaiv relays yuav tsis pom qhov tsis raug lossis tuaj yeem mus tsis raug.
Tias yog vim li cas kev sim thiab kev txheeb xyuas tom qab kev teeb tsa (thiab tom qab ib ntus) yog qhov tseem ceeb heev. Koj xav kom paub meej tias qhov sib piv CT ntsia tau zoo li qhov hloov pauv qhov xav tau tiag tiag.
Xaus
Piv txwv li: ct ratio yog ib qho tseem ceeb tshaj plaws yam ntxwv ntawm ib tug tam sim no transformer siv nrog transformers thiab hwj chim systems. Nws tswj xyuas seb thawj qhov tam sim no tau nce mus rau hauv qhov kev nyab xeeb thib ob tus nqi rau kev ntsuas, kev tiv thaiv, thiab cov cuab yeej saib xyuas.
Xaiv qhov ct piv kom raug, thiab koj yuav tau txais qhov tseeb zoo dua, kev tiv thaiv kev ntseeg siab dua, thiab kev ua haujlwm zoo dua. Nco qhov kev xaiv, thiab koj tuaj yeem mus txog qhov yuam kev-qee zaum koj tuaj yeem them tsawg kawg.
FAQ
Q: Dab tsi yog CT ratio hauv transformer?
A: A ct pivyog qhov piv ntawm cov thawj tam sim no ntws los ntawm tus neeg xyuas pib thiab qhov thib ob tam sim no uas tsim los ntawm tam sim no transformer (CT). Piv txwv li, CT piv ntawm 200: 5 txhais tau hais tias 200A ntawm thawj sab yog hloov mus rau 5A nyob rau sab thib ob rau kev ntsuas thiab tiv thaiv lub hom phiaj.
Q: Kuv yuav xaiv qhov CT piv li cas?
A: Qhov tseebct pivyuav tsum tau xaiv raws li lub transformer tag nrho -load tam sim no, kev cia siab rau yav tom ntej load loj hlob, metering yuav tsum, thiab kev tiv thaiv relay chaw. Qhov zoo tshaj plaws, qhov kev khiav hauj lwm tam sim no yuav tsum poob rau hauv CT qhov ntsuas qhov tseeb tshaj plaws.
Q: Yuav ua li cas yog tias CT ratio siab dhau lossis qis dhau?
A: Yog tiasct pivsiab dhau lawm, CT yuav muab kev nyeem ntawv tsawg dua ntawm cov khoom thauj ib txwm muaj. Yog tias nws qis dhau, CT tuaj yeem ua rau lub sijhawm ua haujlwm tsis raug, uas tuaj yeem cuam tshuam rau kev ua haujlwm relay thiab kev tiv thaiv kev ua haujlwm.
Q: Vim li cas CT ratio tseem ceeb rau kev tiv thaiv transformer?
A: Covct pivncaj qha cuam tshuam cov teeb liab tam sim no xa mus rau kev tiv thaiv relays. Ib qho piv txwv tsis raug tuaj yeem ua rau relays rau kev txhais lus yuam kev hauv lub cev, ua rau kev tshawb pom qhov tsis raug, kev tsis txaus siab, lossis kev tiv thaiv tsis txaus rau lub transformer thiab cov khoom siv txuas nrog.
