Lub hauv paus ntsiab lus ntawm kev ua haujlwm tam sim no transformer
Nyob rau hauv cov kab ntawm lub zog tsim, substation, kis tau tus mob, faib thiab noj, tam sim no 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 ib qho kev sib txuam 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, uas 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 tus taw tes - hom ammeters, feem ntau ntawm cov tam sim no theem nrab ntawm cov transformers tam sim no nyob rau hauv lub ampere theem (xws li 5A, thiab lwm yam). Rau cov cuab yeej digital, cov qauv ntsuas feem ntau yog nyob ntawm qib milliamp (0-5V, 4-20mA, thiab lwm yam). Qhov thib ob tam sim no ntawm qhov me me tam sim no transformer yog milliampere, uas feem ntau ua raws li tus choj ntawm qhov loj transformer thiab cov qauv.
Miniature current transformers are also called "instrument current transformers". ("Instrument current transformer" has a meaning that it is a multi-current ratio precision current transformer used in the laboratory, which is generally used to expand the instrument range.)
Zoo ib yam li transformer, tam sim no transformer 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 txuas nrog lub ntsuas ntsuas (tus naj npawb ntawm lem yog N2) yog hu ua Secondary winding (los yog theem nrab winding). winding, thib ob winding).
Tam sim no tus piv ntawm thawj winding tam sim no I1 mus rau theem nrab winding I2 ntawm lub tam sim no transformer yog hu ua qhov tseeb tam sim no piv K. Qhov tam sim no piv ntawm lub tam sim no transformer thaum nws ua hauj lwm nyob rau hauv lub rated tam sim no hu ua qhov ntsuas tam sim no piv ntawm tam sim no transformer. , hais los ntawm Kn.
Kn=I1n/I2n
Kev ua haujlwm ntawm tam sim no transformer yog hloov lub hauv paus tam sim no nrog tus nqi loj dua rau hauv qhov thib ob tam sim no nrog tus nqi me me los ntawm qee qhov kev hloov pauv, uas yog siv rau kev tiv thaiv, ntsuas thiab lwm yam. Piv txwv li, tam sim no transformer nrog qhov sib piv ntawm 400/5 tuaj yeem hloov qhov tam sim no ntawm 400A mus rau qhov tam sim no ntawm 5A.
