Taw qhia
Tam sim no transformer (CT) yog ib qho tseem ceeb ntsuas transformer siv los ntsuas, saib xyuas, thiab tiv thaiv hluav taws xob tshuab. Nws lub luag haujlwm tseem ceeb yog los hloov lub siab tseem ceeb tam sim no mus rau theem nrab tam sim no uas tuaj yeem ruaj ntseg txuas nrog cov ntsuas, cov cuab yeej saib xyuas, thiab kev tiv thaiv relays.
Txhawm rau xaiv CT txoj cai rau daim ntawv thov hluav taws xob, nws yog ib qho tseem ceeb kom nkag siab txog nws cov yam ntxwv yooj yim. Cov yam ntxwv no txiav txim siab seb qhov CT ua tau zoo thiab ntseeg tau li cas raws li kev ua haujlwm ib txwm muaj thiab, rau cov ntawv thov kev tiv thaiv, thaum muaj xwm txheej txawv txav lossis ua txhaum.
Cov yam ntxwv tseem ceeb tshaj plaws suav nrog qhov piv txwv tam sim no, ntsuas thawj zaug thiab theem nrab tam sim no, qhov tseeb hauv chav kawm, lub nra, zaus, qib rwb thaiv tsev, excitation yam ntxwv, saturation kev ua tau zoo, polarity, thiab daim ntawv thov hom.
1. Kev hloov pauv tam sim no
Qhov kev hloov pauv tam sim no yog ib qho ntawm cov yam ntxwv tseem ceeb ntawm CT.
Nws sawv cev rau kev sib raug zoo ntawm qhov ntsuas thawj tam sim no thiab ntsuas theem nrab tam sim no.
Piv txwv li, CT ntsuas ntawm 500 / 5A yog tsim los muab kwv yees li 5A theem nrab tam sim no thaum thawj qhov tam sim no yog 500A nyob rau hauv cov xwm txheej ntsuas.
Lwm qhov piv txwv muaj xws li 100/5A, 200/5A, 400/5A, 600/5A, thiab 1000/5A.
Qhov sib piv yuav tsum raug xaiv raws li qhov xav tau ntawm lub hauv paus tam sim no thiab cov kev xav tau ntawm kev ntsuas kev sib txuas lossis cov cuab yeej tiv thaiv.
2. Rated Primary Tam sim no
Rated thawj tam sim no yog thawj tus nqi tam sim no uas CT tau tsim los ua haujlwm raws li cov xwm txheej tau teev tseg.
Nws yog ib txwm hais nyob rau hauv amperes.
Piv txwv li, nyob rau hauv ib tug 600/5A CT, qhov ntsuas thawj tam sim no yog 600A.
Xaiv qhov tsim nyog ntsuas tam sim no yog qhov tseem ceeb vim tias CT yuav tsum ua kom haum rau qhov xav tau hluav taws xob thauj khoom thiab kev ua haujlwm.
Yog tias CT yog qhov loj dua rau qhov kev thauj khoom tiag tiag, kev ntsuas kev ua haujlwm yuav tsis zoo rau qee qhov kev siv. Yog tias thawj qhov tam sim no tsis tu ncua tshaj li CT tus nqi ntsuas, qhov ntsuas kub thiab qhov tseeb yog qhov tseem ceeb.
3. Rated Secondary Tam sim no
Rated Secondary tam sim no yog qhov tam sim no uas CT yog tsim los muab thaum thawj qhov tam sim no ncav cuag nws cov nqi ntsuas.
Cov kev ntsuas theem nrab suav nrog 1A thiab 5A.
Piv txwv li:
* 400/5A CT → 5A nyob rau theem nrab tam sim no
* 1000/5A CT → 5A nyob rau theem nrab tam sim no
* 400/1A CT → 1A nyob rau theem nrab tam sim no
Qhov ntsuas thib ob yuav tsum tau sib xws nrog lub ntsuas ntsuas, relay, lossis ntsuas ntsuas.
4. Chav kawm raug
Cov chav kawm raug piav qhia txog qhov kev ntsuas kev ua tau zoo ntawm CT raws li kev ua haujlwm tau teev tseg.
Cov ntawv thov sib txawv yuav tsum muaj qib sib txawv.
Metering CTs yog tsim los muab kev ntsuas tam sim no rau lub zog ntsuas hluav taws xob thiab kev saib xyuas cov tshuab.
Kev tiv thaiv CTs yog tsim los tswj kev ua haujlwm tsim nyog thaum lub sijhawm ua txhaum cai kom cov kev tiv thaiv relays tuaj yeem tau txais cov ntaub ntawv tseem ceeb tam sim no.
Yog li cov chav kawm raug tsim nyog yuav tsum raug xaiv raws li lub hom phiaj ntawm CT.
5. Lub nra
Burden yog lwm tus yam ntxwv tseem ceeb.
Nws sawv cev rau cov load txuas nrog CT thib ob Circuit Court thiab feem ntau suav nrog impedance ntawm meters, relays, cables, terminals, thiab lwm yam khoom siv thib ob.
Yog tias lub nra hnyav tshaj CT lub nra hnyav, CT yuav tsis tuav nws qhov tseeb lossis kev ua haujlwm.
Vim li no, cov khoom siv txuas ntxiv txuas ntxiv thiab ntev cable yuav tsum raug txiav txim siab thaum xaiv CT.
6. Kev ntsuas zaus
Qhov ntsuas zaus qhia qhov zaus uas CT tau tsim.
Common zog-system zaus muaj xws li 50 Hz thiab 60 Hz.
CT yuav tsum tsim nyog rau qhov zaus ntawm lub tshuab hluav taws xob uas nws tau teeb tsa.
Ntau zaus cuam tshuam rau tus cwj pwm sib nqus ntawm cov tub ntxhais thiab tuaj yeem cuam tshuam CT kev ua haujlwm.
7. Rwb thaiv tsev Level
Rwb thaiv tsev theem tseem ceeb tshwj xeeb tshaj yog rau nruab nrab - thiab siab -voltage CTs.
CT rwb thaiv tsev yuav tsum tiv taus qhov kev ua haujlwm ib txwm muaj hluav taws xob thiab siv hluav taws xob cuam tshuam ntawm qhov system.
Rwb thaiv tsev kev ua tau zoo nyob ntawm CT kev tsim kho, cov khoom siv, ib puag ncig, thiab qib voltage.
Kev rwb thaiv tsev kom zoo yog qhov tseem ceeb rau kev ua haujlwm ruaj khov thiab nyab xeeb.
8. Cov yam ntxwv zoo siab
Cov yam ntxwv ntawm excitation piav txog kev sib raug zoo ntawm qhov hluav taws xob siv rau CT theem nrab thiab cov excitation tam sim no xav tau los ntawm cov tub ntxhais hlau nplaum.
Lawv muab cov ntaub ntawv tseem ceeb hais txog tus cwj pwm sib nqus ntawm CT.
Cov yam ntxwv zoo siab yog qhov tseem ceeb tshwj xeeb rau kev tiv thaiv CTs vim tias lawv tuaj yeem pab txiav txim siab lub ntsiab lus ntawm qhov tseem ceeb mus txog qhov saturation.
Kev ntsuam xyuas cov yam ntxwv ntawm excitation kuj tuaj yeem pab txheeb xyuas qee yam teeb meem nrog lub tshuab hluav taws xob sib nqus.
9. Saturation Performance
CT yuav tsum muaj cov yam ntxwv txaus txaus rau nws qhov kev thov.
Saturation tshwm sim thaum cov tub ntxhais hlau nplaum tsis tuaj yeem tswj tau qhov sib npaug ntawm cov hlau nplaum thiab kev ua kom zoo siab.
Thaum muaj kev txhaum, thawj qhov tam sim no tuaj yeem ua rau siab heev. Yog hais tias CT saturates ntau dhau, qhov thib ob tam sim no waveform tuaj yeem hloov pauv.
Rau metering daim ntawv thov, saturation tuaj yeem ua rau ntsuas qhov yuam kev.
Rau kev tiv thaiv daim ntawv thov, ntau saturation tuaj yeem cuam tshuam cov teeb liab tam sim no tau txais los ntawm kev tiv thaiv relays.
Yog li, qhov kev ua tau zoo saturation yuav tsum tau txiav txim siab thaum xaiv ib qho kev tiv thaiv CT.
10. Polarity
CT polarity txheeb xyuas cov kev taw qhia txheeb ze ntawm tam sim no ntawm thawj thiab theem nrab terminals.
Qhov tseeb polarity yog qhov tseem ceeb thaum CTs txuas nrog cov ntsuas, tiv thaiv relays, lossis ntau lub CT circuits.
Cov polarity tsis raug tuaj yeem ua rau qhov ntsuas hluav taws xob tsis raug lossis tus cwj pwm tsis xav tau hauv qee qhov kev tiv thaiv.
CT terminals yog li ntawd ib txwm cim los qhia lawv cov polarity thiab kev sib txuas kev taw qhia.
11. Kev teeb tsa theem pib thiab theem nrab
Tam sim no transformers muaj nyob rau hauv txawv lub cev thiab hluav taws xob configurations.
Cov qauv tsim muaj xws li:
* Ntiv- hom CT
* Qhov rai- hom CT
* Sib faib -core CT
* Bar - hom CT
* Qhov txhab- hom CT
* Toroidal CT
Tus tsim tsim nyog nyob ntawm tus neeg xyuas pib npaj, muaj qhov chaw teeb tsa, theem tam sim no, thiab cov ntawv thov yuav tsum tau ua.
Piv txwv li, kev sib cais -core CT tuaj yeem pab tau rau cov ntawv thov rov qab uas tus neeg xyuas pib tsis tuaj yeem txiav tau yooj yim.
12. Kev ntsuas qhov ntsuas
Qhov kev ntsuas muaj txiaj ntsig zoo yog lwm yam tseem ceeb ntawm CT.
Ib qho CT yuav tsum raug xaiv kom nws lub hom phiaj ua haujlwm tam sim no poob rau hauv qhov chaw uas nws tuaj yeem muab qhov raug tsim nyog.
Rau daim ntawv thov ntsuas, qhov ntsuas qhov ntsuas yuav yog qhov tseem ceeb tshwj xeeb vim tias qhov tseeb ntawm qhov hnyav yuav txawv txav mus rau ib hnub.
Xaiv qhov sib piv tsim nyog yuav pab xyuas kom meej tias CT tuaj yeem muab kev ntsuas muaj txiaj ntsig thoob plaws qhov kev xav tau ua haujlwm.
13. Thermal Performance
Tam sim no ntws los ntawm CT ua kom sov, thiab CT yuav tsum muaj peev xwm ua haujlwm zoo nyob rau hauv nws cov kev txwv thermal.
Thermal kev ua tau zoo nyob ntawm cov yam xws li thawj tam sim no, lub nra nruab nrab, qhov kub thiab txias, kev tswj tus neeg xyuas pib, thiab qhov cua.
Lub CT ntsia rau hauv qhov siab - qhov kub thiab txias switchgear txee tej zaum yuav muaj ntau yam thermal tej yam kev mob los ntawm ib tug ntsia nyob rau hauv ib tug zoo- qhov cua qhov chaw.
Yog li ntawd, qhov chaw ua haujlwm yuav tsum tau txiav txim siab thaum xaiv.
14. Mechanical thiab Environmental yam ntxwv
CT kev ua tau zoo kuj nyob ntawm cov xwm txheej uas lub tshuab hloov pauv tau teeb tsa.
Tej yam tseem ceeb ib puag ncig muaj xws li:
* Kub
* Cov av noo
* Plua plav
* Kev qias neeg
* Kev vibration
* Corrosion
* Qhov siab
* Sab hauv lossis sab nraum zoov installation
Kev tsim kho tshuab yuav tsum tsim nyog rau qhov chaw nruab nrab.
Piv txwv li, cov ntawv thov sab nraum zoov yuav xav tau CT nrog cov ntaub ntawv tsim nyog thiab kev tiv thaiv ib puag ncig.
15. Daim ntawv thov kev ntsuas lossis kev tiv thaiv
Ib qho ntawm cov yam ntxwv tseem ceeb tshaj plaws yog daim ntawv thov npaj.
Lub metering CT yog qhov zoo rau kev ntsuas qhov tseeb.
Kev tiv thaiv CT yog tsim los muab kev ua tau zoo thaum lub sij hawm siab - tam sim no thiab kev ua txhaum.
Ob hom no yuav muaj cov qauv tsim sib txawv, cov yam ntxwv raug, thiab cov kev xav tau ntawm kev ua haujlwm.
Yog li, CT yuav tsum tsis txhob raug xaiv raws li qhov piv txwv tam sim no. Daim ntawv thov npaj yuav tsum tau txiav txim siab.
16. Secondary Circuit Court kev nyab xeeb
Qhov thib ob Circuit Court yog lwm yam tseem ceeb ntawm kev ua haujlwm CT.
Thaum thawj qhov tam sim no ntws, CT theem nrab yuav tsum tau txuas nrog nws qhov kev xav tau los yog ua raws li cov txheej txheem luv luv tau pom zoo.
Lub energized CT theem nrab yuav tsum tsis txhob raug qhib vim qhov hluav taws xob txaus ntshai tuaj yeem txhim kho.
Kho cov kab txuas txuas ntxiv, hauv av, kev txheeb xyuas lub davhlau ya nyob twg, thiab cov txheej txheem kev saib xyuas yog li qhov tseem ceeb rau kev ua haujlwm nyab xeeb.
Yuav xaiv CT li cas raws li nws cov yam ntxwv
Thaum xaiv lub transformer tam sim no, cov neeg siv yuav tsum ntsuas ntau yam ua ke:
1. Rated thawj tam sim no
2. Rated theem nrab tam sim no
3. Tam sim no piv
4. Cov chav kawm raug
5. Lub nra
6. zaus
7. Rwb thaiv tsev theem
8. Saturation yam ntxwv
9. Hom kev teeb tsa
10. Ib puag ncig tej yam kev mob
11. Metering lossis kev tiv thaiv yuav tsum tau ua
12. Cov khoom siv txuas nrog
Kev txiav txim siab tag nrho cov kev txwv no yuav pab xyuas kom meej tias CT phim cov hluav taws xob thiab muab kev ua tau zoo.
Xaus
Cov yam ntxwv tseem ceeb ntawm lub tshuab hluav taws xob tam sim no txiav txim siab seb nws tuaj yeem ntsuas tau zoo npaum li cas, saib xyuas, thiab txhawb nqa kev tiv thaiv hluav taws xob.
Cov yam ntxwv tseem ceeb suav nrog CT piv, ntsuas thawj qhov tam sim no, ntsuas theem nrab tam sim no, chav kawm raug, lub nra, qhov ntsuas zaus, qib rwb thaiv tsev, excitation yam ntxwv, saturation kev ua tau zoo, polarity, thermal ua haujlwm, thiab kev tsim kho lub cev.
Txoj cai CT yuav tsum raug xaiv raws li daim ntawv thov ua tiav es tsis yog ib qho parameter. Los ntawm kev sib piv cov yam ntxwv CT nrog rau cov khoom siv hluav taws xob, cov khoom siv txuas nrog, thiab ib puag ncig kev teeb tsa, cov neeg siv tuaj yeem ua tiav qhov kev ntsuas ntau dua, txhim khu kev qha, thiab kev tiv thaiv hluav taws xob zoo.