Hauv cov kab hluav taws xob tsim hluav taws xob, kev hloov pauv, kev xa tawm, kev faib tawm, thiab kev siv hluav taws xob, cov dej ntws sib txawv heev, xws li los ntawm ob peb amperes mus rau kaum tawm txhiab amperes. Txhawm rau ua kom yooj yim rau kev ntsuas, kev tiv thaiv thiab kev tswj hwm, nws yuav tsum tau hloov mus rau hauv qhov sib xws tam sim no. Tsis tas li ntawd, qhov hluav taws xob ntawm txoj kab yog feem ntau kuj siab, xws li kev ntsuas ncaj qha yog qhov txaus ntshai heev. Tam sim no transformer plays lub luag haujlwm ntawm kev hloov pauv tam sim no thiab kev sib cais hluav taws xob.
Rau cov pointer-type ammeters, qhov thib ob tam sim no ntawm cov tam sim no transformer feem ntau yog ampere-theem (xws li 5A, thiab lwm yam). Rau cov cuab yeej siv digital, cov qauv kuaj pom feem ntau yog milliampere (0-5V, 4-20mA, thiab lwm yam). Qhov thib ob tam sim no ntawm cov khoom me me tam sim no transformer yog milliampere, thiab nws tsuas yog ua tus choj ntawm qhov loj transformer thiab cov qauv.
Miniature tam sim no transformers tseem hu ua "instrument tam sim no transformers". (Lub "cov cuab yeej tam sim no transformer" muaj lub ntsiab lus tias qhov sib piv tam sim no qhov tseeb tam sim no transformer siv nyob rau hauv lub chaw soj nstuam feem ntau yog siv los nthuav ntau qhov ntsuas.)
Tam sim no transformer zoo ib yam li transformer thiab kuj ua haujlwm raws li lub hauv paus ntsiab lus ntawm electromagnetic induction. Lub transformer transforms qhov voltage thiab tam sim no transformer transforms tam sim no. Lub winding ntawm tam sim no transformer txuas nrog ntsuas tam sim no (tus naj npawb ntawm lem yog N1) yog hu ua thawj winding (los yog thawj winding, thawj winding); lub winding (tus naj npawb ntawm lem yog N2) txuas nrog lub ntsuas ntsuas yog hu ua Secondary winding (los yog theem nrab winding) Winding, theem nrab winding).
Qhov sib piv tam sim no ntawm tus thawj winding tam sim no I1 ntawm lub tam sim no transformer thiab theem nrab winding I2 yog hu ua qhov tseeb tam sim no piv K. Qhov piv ntawm tam sim no transformer thaum nws ua hauj lwm ntawm qhov ntsuas tam sim no hu ua tam sim no transformer rated tam sim no ratio, uas yog sawv cev los ntawm Kn.
Kn = I1n/I2n
Kev ua haujlwm ntawm tam sim no transformer (CT) yog los hloov cov thawj tam sim no nrog tus nqi loj dua rau hauv qhov nruab nrab tam sim no nrog tus nqi me dua los ntawm qee qhov kev hloov pauv rau kev tiv thaiv, ntsuas thiab lwm yam. Piv txwv li, tam sim no transformer nrog kev hloov pauv ntawm 400/5 tuaj yeem hloov qhov tam sim no ntawm 400A mus rau qhov tam sim no ntawm 5A.
Post lub sij hawm: Dec-17-2021