Txhawm rau txiav txim siab qhov sib piv tam sim no transformer koj xav tau, pib los ntawm kev suav qhov siab tshaj plaws txuas ntxiv thawj tam sim no. Qhov no yog lub siab tshaj plaws tam sim no lub Circuit Court yuav tsum nqa nyob rau hauv ib txwm ua hauj lwm tej yam kev mob, nrog rau tej kev npaj rau yav tom ntej load. Tsis txhob tsuas yog siv qhov ntsuas qhov ntsuas hluav taws xob lossis qhov ntsuas hluav taws xob hloov pauv tshwj tsis yog tias qhov tseeb ntawm cov khoom tau paub txog qib ntawd. Ib tug CT yuav tsum tau xaiv rau lub load tiag tiag, tsis yog rau qhov loj tshaj plaws ua tau tus neeg xyuas pib lossis ntaus ntawv.
Rau metering daim ntawv thov, qhov kev khiav hauj lwm tam sim no feem ntau yuav tsum nyob nruab nrab ntawm 60% thiab 80% ntawm CT thawj qhov ntsuas. Yog tias qhov kev thauj khoom ib txwm yog 80 A, 100/5 A CT feem ntau yog tsim nyog. Yog tias qhov kev thauj khoom ib txwm yog 300 A, 400/5 A CT yuav tsim nyog. Cov kab no muab qhov tseeb zoo thaum tawm hauv chav rau me me overloads. Ib qho CT nrog qhov sib piv ntau dua yuav tsim qhov me me thib ob tam sim no ntawm kev thauj khoom ib txwm, uas tuaj yeem txo qhov raug thiab daws teeb meem.
Rau kev tiv thaiv daim ntawv thov, tus piv yuav tsum tso cai rau lub relay pom kev txhaum tam sim no kom meej. CT yuav tsum tsis txhob saturate ua ntej relay ua haujlwm. Qhov kev txwv qhov tseeb thiab lub hauv caug taw tes voltage yog qhov tseem ceeb ntawm no. Kev tiv thaiv CT yuav xav tau qhov sib piv qis dua li qhov ntsuas CT kom muab cov khoom nruab nrab tam sim no txaus thaum lub sij hawm qis - theem faults, tab sis nws yuav tsum tiv taus siab tam sim no tsis muaj kev puas tsuaj. Cov kev teeb tsa relay thiab kev kawm sib koom tes yuav tsum coj cov kev xaiv zaum kawg.
Qhov thib ob tam sim no yuav tsum phim cov khoom siv txuas nrog. Feem ntau cov 'meter' thiab relays txais 5 A, thaum 1 A feem ntau muaj nyob hauv qee lub tshuab. A 1 A theem nrab txo lub nra thiab cable poob, uas yog qhov tseem ceeb rau kev khiav mus ntev. Qhov piv yuav tsum tau programmed kom raug rau hauv lub 'meter' los yog relay. Piv txwv li, 200/5 A CT muaj qhov sib piv ntawm 40: 1. Yog tias lub meter tau txais 2.5 A, thawj qhov tam sim no yog 100 A. Yog tias qhov piv tau nkag tsis raug, tag nrho cov kev nyeem yuav tsis raug.
Tus qauv piv yuav tsum tau siv thaum twg los tau. Piv txwv xws li 50/5, 75/5, 100/5, 150/5, 200/5, 300/5, 400/5, 600/5, 800/5, thiab 1000/5. Tus qauv piv tau yooj yim, raug nqi tsawg, thiab hloov tau yooj yim dua. Cov kev cai sib piv yuav xav tau nyob rau hauv cov xwm txheej tshwj xeeb, tab sis lawv yuav tsum tau zam tshwj tsis yog tias tsim nyog.
Cov yam ntxwv ntawm lub cev kuj tseem tuaj yeem cuam tshuam qhov piv. Qhov siab - piv CT feem ntau loj dua thiab tej zaum yuav tsis haum rau qhov chaw muaj. Busbar- hom CTs yog ib txwm muaj rau cov tam sim no siab, thaum sib cais -core CTs yog qhov muaj txiaj ntsig zoo rau kev rov ua dua tshiab. Lub qhov rais CT yuav tsum haum rau lub cable los yog busbar, thiab lub rwb thaiv tsev theem yuav tsum phim qhov system voltage.
Hauv cov ntsiab lus, txiav txim siab qhov siab tshaj plaws tam sim no, siv 60-80% txoj cai rau kev ntsuas, xyuas cov kev tiv thaiv kev tiv thaiv, phim cov khoom siv thib ob, siv tus qauv sib piv, thiab txheeb xyuas lub cev haum. Ib qho piv txwv uas raug xaiv kom raug ntsuas qhov tseeb, kev tiv thaiv txhim khu kev qha, thiab kev ua haujlwm nyab xeeb. Ib qho kev xaiv tsis zoo tuaj yeem ua rau cov nqi them tsis raug, kev mus ncig tsis raug, lossis tsis pom qhov tsis raug.