Cov ntawv thov tam sim no xav tau ceev faj xaiv CT vim tias qhov tseem ceeb tam sim no tuaj yeem yog ntau txhiab amperes. Nyob rau theem no, thermal stress, magnetic rog, saturation, thiab installation qhov chaw ua ib qho kev txhawj xeeb loj. CT uas ua haujlwm tau zoo nyob rau hauv qis - lub vaj huam sib luag tam sim no yuav ua tsis tiav nyob rau hauv siab -tam sim no busbar system. Cov txheej txheem xaiv yuav tsum xav txog hluav taws xob, thermal, mechanical, thiab ib puag ncig yam.
Thawj kauj ruam yog los txiav txim siab qhov siab tshaj plaws txuas ntxiv tam sim no thiab qhov xav tau tam sim no txhaum cai. CT ratio yuav tsum siab txaus los tuav lub nra hnyav thiab nthuav dav yav tom ntej. Feem ntau siab- cov piv txwv tam sim no suav nrog 1000/5, 2000/5, 3000/5, thiab 4000/5. Cov zis thib ob yuav yog 5 A lossis 1 A. A 1 A theem nrab feem ntau nyiam nyob rau hauv siab - cov tshuab tam sim no vim nws txo lub nra thiab cable poob, tshwj xeeb tshaj yog thaum CT nyob deb ntawm lub 'meter' lossis relay.
Kev ntsuas cua sov yog qhov tseem ceeb. CT yuav tsum tiv taus qhov tam sim no tsis tu ncua tsis pub dhau nws qhov ntsuas kub. Nws kuj yuav tsum tiv taus luv luv - lub sij hawm thermal tam sim no, uas yog qhov txhaum tam sim no nws tuaj yeem nqa tau rau lub sijhawm, feem ntau yog 1 thib ob lossis 3 vib nas this. Qhov ntsuas tam sim no dynamic qhia tias lub ncov tam sim no nws tuaj yeem tiv taus yam tsis muaj kev puas tsuaj. Siab -tam sim no faults tsim muaj zog sib nqus zog uas tuaj yeem deform los yog tawg tsis zoo CTs.
Busbar- hom CTs feem ntau yog siv hauv siab - cov ntawv thov tam sim no. Lawv muaj lub qhov rais loj lossis qhib uas tso cai rau lub tsheb npav hla dhau. Qee qhov yog tsim los ua qhov rais-hom CTs, thaum lwm tus raug mob-thawj CTs. Lub CT yuav tsum haum rau qhov ntev ntawm lub busbar thiab lub switchgear enclosure. Qhov sib nrug kom zoo thiab rwb thaiv tsev yog qhov tseem ceeb los tiv thaiv flashover thiab overheating. Cov cua txias yuav tsum tau nyob hauv qhov chaw kaw.
Saturation yuav tsum tau xav txog. Kev ua txhaum loj tam sim no tuaj yeem tsav lub CT mus rau hauv saturation, ua rau muaj kev cuam tshuam rau theem nrab tam sim no thiab kev tiv thaiv tsis ua haujlwm. Qhov raug txwv qhov tseem ceeb thiab lub hauv caug taw tes voltage yuav tsum tsim nyog rau txoj kev tiv thaiv. Rau metering, CT yuav tsum nyob twj ywm ntawm ib txwm load thiab nruab nrab overloads. Rau kev tiv thaiv, CT yuav tsum rov tsim dua qhov txhaum tam sim no kom txaus rau lub relay ua haujlwm.
Split-Core CTs yog qee zaum siv hauv siab -tam sim no retrofits, tab sis lawv yuav muaj qhov raug qis dua thiab lub zog txhua yam dua li cov khoom siv -core CTs. Lawv yooj yim thaum cov cables lossis busbars tsis tuaj yeem raug txiav, tab sis lawv yuav tsum tau xaiv nrog kev saib xyuas. Cov khoom tseem ceeb, winding tsim, thiab kev tsim kho zoo cuam tshuam rau kev ua haujlwm.
Kev txhim kho thiab kev nyab xeeb yog qhov tseem ceeb. Lub CT yuav tsum tau txuas ruaj ntseg, nrog qhov tseeb polarity thiab grounding. Lub voj voog thib ob yuav tsum tsis txhob qhib thaum thawj qhov tam sim no ntws. Kev ntsuas yuav tsum muaj qhov sib piv, polarity, rwb thaiv tsev tsis kam, thiab ntsuas lub nra. Hauv siab - cov tshuab tam sim no, txawm tias qhov teeb meem me me tuaj yeem ua rau muaj kev puas tsuaj loj.
Hauv cov ntsiab lus, xaiv qhov siab -Tam sim no CT los ntawm kev suav cov load thiab qhov txhaum tam sim no, xaiv qhov tsim nyog piv thiab cov txiaj ntsig thib ob, tshuaj xyuas qhov ntsuas cua sov thiab lub zog, txheeb xyuas cov busbar haum, txiav txim siab saturation, thiab xyuas kom muaj kev nyab xeeb. Lub zog, zoo- sib luag CT yuav muab kev ntsuas raug thiab kev tiv thaiv kev ntseeg siab hauv kev xav tau siab - ib puag ncig tam sim no.