TusDC ua kom tsis kam (DCR)ntawm lub zog hloov hluav taws xob yog hais txog qhovohmic tsis kam ntawm nws tooj liab (lossis txhuas) windings thaum ntsuas nrog ncaj qha tam sim no (DC), feem ntau siv ib tug ohmmeter. Nws yog qhov tseem ceeb ntawm cov hlau nws tus kheej thiab yogtxawv los ntawm transformer lub impedance (uas yog ac ntsig txog).
Ntawm no yog kev tawg ntawm nws txhais li cas thiab vim li cas nws tseem ceeb:
Dab tsi nws sawv cev:
Nws yog qhov hluav taws xob ntshiab tsis kam ntawm qhov ntev thiab kawg cov xaim xaim uas siv hauv thawj lub tshuab hluav taws xob thiab theem nrab.
Nws ua raws li OHM txoj cai (v=i * r_dc).
Yuav ua li cas nws ntsuas:
Nrog lub transformerdisconnected los ntawm txhua lub zog siv thiab thauj khoom, ib tug ohmmeter (los yog tshwj xeeb tsawg-txwv tsis pub zoo li ib tug milli-Ohm meter) tau txuas ncaj qha rau cov terminals ntawm cua (thawj lossis theem nrab).
Cov Lus Tseem Ceeb:Lub xub ntiag winding feem ntau muaj asiab duaDC tsis zoo tshaj qhov winder thib ob, txawm hais tias thawj voltage yog siab dua. Qhov no yog vim tias thawj tswj cov hlau roj nyias nyias (vim yog qis dua tam sim no) tab sis muaj ntau qhov lem ntxiv (ntev dua). Qhov thib ob siv hlau tuab (rau siab dua tam sim no) tab sis hloov dua.
Vim li cas nws tseem ceeb (cov teebmeem):
Tooj liab poob (I²R poob):Nov yog tusthawj qhov tseem ceeb.Thaum tus hloov pauv khoom siv AC thauj khoom tam sim no, lub zog muaj zog ua cua sov hauv cov windings vim lawv DC tsis kam. Lub zog poob yog xam raws li I² * R_DC (rau txhua lub winding), qhov twg kuv yog RMS tam sim no ntws los ntawm cua. Cov kev poob no txo cov hloov pauv tau zoo thiab ua rau cua sov.
Voltage poob:Nyob rau hauv thauj, daim ntawv sau ua rau ib qho me me sab hauv hluav taws xob poob (v_drop=i_load * r_dc). Qhov no pab txhawb rau lub transformer's txoj cai "- qhov sib txawv ntawm nws tsis muaj-load voltage thiab nws tag nrho-load voltage. Ib qho siab dua cov qauv txhais tau tias cov kev cai tswj hwm tsis zoo (loj dua voltage poob raws li kev thauj khoom nce).
Inrush tam sim no txwv:Daim DCR ntawm lub winding ua lub luag haujlwm (nrog kev siv tsis meej) rau hauv qhov kev kub ntxhov "uas ntws thaum lub transformer tam sim no ua kom muaj zog rau kev ua si AC.
Qhov kub nce:I²R poob yog qhov chaw loj ntawm tshav kub hauv lub transformer, cuam tshuam ncaj qha rau nws cov kev ua haujlwm kub thiab cua tsim.
Yam cuam tshuam rau DCR:
Cov Qauv Siv:Tooj liab muaj qhov qis dua ntau dua li txhuas, yog li cov ntaub tawv taum tau qis dua dCR rau tib lub ntsuas thiab qhov ntev.
HLAU HAIV NEEG (CROSS-Seem):Thicker hlau muaj cov qis kuj.
Ntev ntawm xaim:Ntau lem txhais tau tias xaim tsheb thiab ntau dua kev tiv taus.
Kub:Kuj muaj nce nrog kub (zoo ntsuas coefficient: r_hot=r_cold}}}} * t_cold)]). DCR feem ntau yog teev ntawm tus qauv kub (piv txwv li, 20℃lossis 75 degree).
Qhov sib txawv ntawm Impedance:
Daim yas dcryog atiag, DC Ntau(ntsuas hauv Ohms, ω) sawv cev rau cov xaim hluav taws xob tsis kam.
Impedance (z)yog acomplex, ac kom muaj nuj nqis(Kuj tseem nyob rau hauv ohms, ω, tab sis feem ntau muab raws li feem pua -% z) sawv cev rautag nrhoKev tawm tsam lub transformer nthuav qhia rau AC tam sim no ntws hauv qab thauj khoom. Nws suav nrog qhov cuam tshuam ntawm cov dcr, to toctuctance inductance, thiab cov kev poob tub ntxhais. % Z yog qhov tseem ceeb heev rau kev suav nrog luv luv.
Hauv cov ntsiab lus:
DC tus nqi (DCR) ntawm lub zog hloov pauv yog qhov ntsuas Ohmic tsis kam ntawm nws cov tooj liab lossis txhuas windings. Nws thawj qhov tseem ceeb nyob hauv kev suavKev Poob Tooj (I²R poob)uas cuam tshuamua tau zoothiabQhov kub nce, thiab nyob rau hauv pab txhawb rau lubkev cai voltagehauv qab thauj khoom. Nws yog qhov tsim qauv tsim qauv tsis sib xws los ntawm kev hloov pauv tus kheej acckedance.