Yuav Ua Li Cas Xam Lub Hwj Chim Zog, Lub Hwj Chim Muaj Zog, thiab Lub Hwj Chim Pom Zoo? Lawv Li Cas?
Lub zog nquag: Hauv AC Circuit Court, lub zog nquag ntawm txhua qhov tam sim no txawv thiab hloov tas li. Feem ntau, qhov nruab nrab lub zog siv hluav taws xob (qhov nruab nrab tus nqi ntawm lub hwj chim hauv ib lub voj voog) yog siv los ntsuas lub zog siv hauv Circuit Court.
Rau ib-theem AC Circuit Court, cov qauv kev suav yog P=UIcosΦ
qhov twg:
P-active zog (watts)
U-zoo tus nqi ntawm AC voltage (volts)
I-tus nqi zoo ntawm kev hloov tam sim no (A)
cosΦ - lub hwj chim yam ntxwv ntawm lub load
Chav tsev ntawm lub zog muaj zog yog watt (W) lossis kilowatt (KW), megawatt (MW).
Thaum lub load yog huv si, qhov voltage thiab tam sim no theem yog tib yam, Φ=0 degree, cosΦ{1}}, thiab lub hwj chim noj los ntawm tus resistor yog tag nrho cov active zog (P=UI ).
Thaum lub load yog ntshiab inductance los yog ntshiab capacitance, lub theem sib txawv ntawm voltage thiab tam sim no yog Φ=90 degree, cosΦ=0, thiab nquag zog P=0, yog li ntshiab inductive los yog ntshiab capacitive load. tsis siv lub zog ua haujlwm.
Lub zog muaj zog: txhawm rau ntsuas qhov xwm txheej ntawm kev sib hloov lub zog, tib neeg siv tus nqi siab tshaj plaws ntawm lub zog hauv cov txheej txheem ntawm lub zog pauv (uas yog, qhov siab tshaj plaws ntawm lub zog tam sim no) los sawv cev rau lub zog reactive.
Raws li cov qauv, cov qauv kev suav ntawm reactive zog Q yog: Q=UIsinΦ
Hauv cov qauv: sinΦ - tus nqi sine ntawm theem sib txawv ntawm AC voltage thiab tam sim no.
Chav tsev ntawm reactive zog yog var (var) los yog kilovar (Kvar), megavar (Mvar).
Thaum lub load yog ntshiab inductance los yog ntshiab capacitance, Φ=90 degree, sinΦ=1. Yog li Q=UI, uas yog, tsuas muaj lub zog reactive thiab tsis muaj zog siv tau. Thaum lub load yog huv si, Φ=0 degree , sinΦ=0, yog li Q=0, uas yog, tsuas active zog yog noj tsis muaj reactive zog.
Pom tseeb lub zog: Hauv ib qho kev sib txuas AC, muaj ob qho tib si nquag thiab cov khoom siv hluav taws xob hauv cov hluav taws xob xa hluav taws xob. Yog li, cov khoom ntawm RMS voltage thiab RMS tam sim no tsis yog lub zog ua haujlwm lossis lub zog reactive, tab sis lawv cov khoom ua ke. Qhov sib xyaw ua ke no yog hu ua lub zog pom tseeb, sawv cev los ntawm tsab ntawv S.
S UI
Chav tsev ntawm lub zog pom tseeb yog volt-ampere (VA), lossis kilovolt-ampere (KVA), megavolt-ampere (MVA).
Cov cuab yeej siv hluav taws xob AC tsim thiab siv raws li qhov tshwj xeeb voltage thiab tam sim no, yog li qee zaum nws yooj yim dua los nthuav qhia lub peev xwm ntawm cov khoom siv nrog lub zog pom tseeb. Piv txwv li, lub peev xwm ntawm lub transformer yog hais txog nws lub zog pom tseeb.
Qhov kev sib raug zoo ntawm lub zog S, active zog P, thiab reactive zog Q yog raws nraim sib npaug rau peb-sided kev sib raug zoo ntawm txoj cai-lub kaum sab xis daim duab peb sab. S yog sib npaug rau lub hypotenuse, thiab P thiab Q yog sib npaug rau ob sab sab xis, uas yog hu ua lub zog peb sab.
Nws cov qauv hloov dua siab tshiab yog raws li hauv qab no:
S²＝Q²＋P²
cosΦ=P/S Nws tuaj yeem pom tau tias lub zog ntawm cosΦ tuaj yeem txhais tau tias yog qhov piv ntawm lub zog siv hluav taws xob siv los ntawm kev thauj khoom mus rau nws lub zog pom tseeb, uas sawv cev rau qhov feem pua ntawm cov khoom siv hluav taws xob siv los ntawm kev thauj khoom hauv lub zog pom.
