Cov chav kawm raug ntawm qhov tam sim no transformer txhais tau hais tias nws rov tsim dua cov thawj tam sim no hauv lub voj voog thib ob. Nws yog qhov kev xaiv tseem ceeb vim tias cov ntawv thov sib txawv xav tau ntau theem ntawm qhov tseeb. Xaiv cov chav kawm raug uas tsawg dhau tuaj yeem ua rau kev ntsuas yuam kev, kev tsis sib haum txog kev them nqi, lossis kev tiv thaiv tsis tuaj yeem. Xaiv ib chav kawm uas tsis tsim nyog yuav tsum tau nce nqi thiab yuav tsis muab cov txiaj ntsig zoo.
Rau kev ntsuas dav dav, chav kawm 1.0 lossis 0.5 feem ntau siv. Chav kawm 0.5 txhais tau tias CT yuam kev yog nyob rau hauv ± 0.5% ntawm cov kev ntsuas ntsuas. Qhov no yog tsim rau ntau yam kev soj ntsuam kev lag luam thiab kev ntsuas hluav taws xob. Chav Kawm 1.0 yog qhov lees txais rau qhov ntsuas qhov tseem ceeb tsawg qhov twg qhov yuam kev me me tuaj yeem zam tau. Cov chav kawm no muaj nyob rau hauv vaj huam sib luag meters, controllers, thiab general-lub hom phiaj saib xyuas.
Rau kev ntsuas lub zog, qhov tseeb dua yog feem ntau xav tau. Chav kawm 0.5S thiab 0.2S muaj ntau hauv kev them nqi thiab kev ntsuas hluav taws xob. Qhov "S" qhia tau hais tias CT tswj qhov tseeb ntawm qhov dav dav, suav nrog cov tam sim no qis. Qhov no yog qhov tseem ceeb vim tias lub zog ntsuas hluav taws xob yuav tsum ntsuas qhov ntsuas lub teeb thiab cov khoom hnyav. Chav kawm 0.2S yog qhov tseeb dua 0.5S thiab feem ntau yog siv rau siab - tus nqi them nqi lossis kev tswj xyuas lub zog.
Rau daim ntawv thov kev tiv thaiv, chav kawm raug qhia txawv. Cov chav kawm xws li 5P10, 5P20, thiab 10P10 muaj ntau. Thawj tus lej qhia txog qhov yuam kev sib xyaw ntawm qhov raug txwv qhov tseeb. Piv txwv li, 5P txhais tau tias yog 5% kev ua yuam kev. Tus lej thib ob, xws li 10 lossis 20, yog qhov txwv qhov tseeb. A 5P20 CT tuaj yeem tswj hwm nws qhov yuam kev txog li 20 npaug ntawm qhov ntsuas tam sim no. Kev tiv thaiv CTs feem ntau tsis yog xaiv rau qhov tsis zoo ntawm theem qis ntawm qhov qub; lawv raug xaiv rau kev txhim khu kev qha thaum ua txhaum.
Kev hloov pauv theem yog lwm qhov kev xav tseem ceeb. Txawm hais tias qhov ntsuas qhov ntsuas tam sim no yog qhov tseeb, qhov hloov pauv theem ntawm thawj thiab theem nrab tam sim no tuaj yeem ua rau muaj qhov yuam kev hauv kev ntsuas lub zog thiab lub zog. Rau kev ntsuas hluav taws xob, qis theem hloov chaw yog qhov tseem ceeb. Metering CTs yog tsim los kom muaj qhov ua yuam kev me me, thaum kev tiv thaiv CTs tuaj yeem muaj qhov yuam kev loj dua vim lawv feem ntau cuam tshuam nrog kev kuaj xyuas qhov txhaum.
Burden cuam tshuam qhov tseeb. CT yog ntsuas ntawm ib lub nra hnyav, feem ntau 25% lossis 100% ntawm lub nra hnyav. Yog tias lub nra tiag tiag siab dua li lub nra hnyav, CT yuav saturate thiab poob qhov tseeb. Yog tias lub nra hnyav dua, qhov tseeb yuav txhim kho, tab sis CT yuav tsis ua haujlwm ntawm nws qhov zoo tagnrho. Kev sib txuas 'meter', relay, terminals, thiab cables yuav tsum tau suav nrog hauv kev suav cov nra.
Ib puag ncig thiab kev teeb tsa tuaj yeem cuam tshuam qhov raug. Kub, vibration, thiab sib nqus cuam tshuam tuaj yeem cuam tshuam kev ua haujlwm. CT yuav tsum tau nruab nrog qhov tseeb polarity thiab grounding. Secondary Circuit Court yuav tsum tsis txhob qhib nyob rau hauv load. Tom qab kev teeb tsa, calibration thiab kuaj yuav tsum tau ua kom paub tseeb tias qhov tseeb.
Hauv kev xaus, xaiv cov chav kawm raug raws li daim ntawv thov. Siv 0.5 lossis 1.0 rau kev ntsuas dav dav, 0.2S lossis 0.5S rau kev ntsuas lub zog, thiab chav kawm 5P lossis 10P rau kev tiv thaiv. Xav txog theem yuam kev, lub nra, thiab kev ua haujlwm ntau. Cov chav kawm raug raug muab qhov xav tau precision yam tsis muaj nqi tsim nyog.