Cia saib yuav ua li cas tam sim no muab xam yog tau rau lub hwj chim

Ua ntej cov tswv yim rau tus tsim ntawm hluav taws xob nyob rau hauv koj lub tsev, koj yuav tsum ua ib tug them nyiaj tswvyim nrog ib tug hais txog ntawm tus xav loads nyob rau thaj chaw thiab qhov ntev ntawm tus neeg seem ntawm lub cable. Yuav kom ua ke xws li ib tug tswvyim thiab qhov yuav tsum tau los mus laij lub "hwjchim" tam sim no. Yog kuas hluav taws xob lub tsev yuav tsum khaws cov tsim nyog seem ntawm cables uas yuav tiv thaiv koj xov los ntawm overheating thiab, raws li, tau ntawm hluav taws. Cia peb kawm saib, tab sis dab tsi yog qhov muab xam los ntawm cov "hwjchim" tam sim no.

Kom xaiv ntawm switching pab kiag li lawm thiab cable ntoo khaub lig-section nyob rau qhov sib txawv tseem ceeb ntawm ciaj ciam ntawm hluav taws xob tes hauj lwm. Qhov tseem ceeb tshaj ntawm lawv yog cov hluav taws xob tam sim no. Thiab nyob rau theem ntawm tsim cov qhov tseem ceeb yuav tsuas yuav txiav txim los ntawm ib tug zauv muab xam. Heev tseem ceeb yog suav hais tias yog "lub hwj chim" ntawm qhov tam sim no muab xam nyob rau hauv peb-theem hauj lwm, qhov chaw uas lub load yuav tsum tau muab tso rau tusyees ntawm cov theem, kom tsis txhob distortions. Txawm li cas los, nyob rau hauv nroog thaj tes hauj lwm, cov suav yuav tsum tau nqa tawm nyob rau hauv lub tsim ntawm tsis tsuas yog lub ntaub thaiv npog tab sis kuj thaj.

"Fais fab" tam sim no muab xam yog muab hluav taws xob paub qhov tseem ceeb, qhov xwm ntawm loads thiab cov mov voltage. Rau ib leeg-theem mains siv cov nram qab no mis: I = P / (U × cosφ), qhov chaw uas:

• U - lub sij voltage tus nqi yog ntsuas nyob rau hauv volts;
• cosφ - coj hwj chim tshaj.

Nyob ntawm seb qhov xwm ntawm tus load hwj chim tshaj yog xaiv. Yog li, rau cov active load (rhaub hais, incandescent teeb) nws yog kwv yees li sib npaug zos rau kev sib sau. Txawm li cas los, thaum koj xav txog hais tias nyob rau hauv lub resistive load yeej ib txwm ib tug reactive tivthaiv, ces tus muab xam yog ib qho siv tus nqi ntawm cos, sib npaug zos rau 0,95. Thaum lub load muab xam, uas yog yus muaj los ntawm siab reactive hwj chim (txhawm chim teeb pom kev zoo, electric motors, induction cua sov, vuam transformers , etc.) Noj phem tus nqi cosφ, sib npaug zos rau 0.8.

Rau mis-theem AC fais fab mov yuav muaj cov nram qab no daim ntawv: I = P / (1,73 × U × cosφ).

Peb-theem tes hauj lwm hwj chim tshaj rau cov nquag thiab reactive loads yog kiag li zoo tib yam nkaus xwb-theem tes hauj lwm.

Yog li, siv lub saum toj no cov qauv yog tsim nyog los ua kev cai suav ntawm tag nrho cov hwj chim loads ntawm hluav taws xob tam sim no qhov tseem ceeb, yuav tsum tau siv rau ib qho kev kawm ntawv.

Cov theem tom ntej ntawm peb suav, yuav cov kev xaiv ntawm cable ntoo khaub lig seem. Txawm hais tias kev ntaub ntawv yuav feem ntau nrhiav tau xws li ib tug tshaj plaws raws li ib tug "muab xam hwj chim cable", nyob rau hauv qhov tseeb, nws yog tsis xam, tab sis tseem "xaiv". Nyob rau hauv to taub xam mis rau kev txiav txim tam sim no load saum toj no. Nyob rau hauv lub xub ntiag ntawm tej yam tseem ceeb ntawm tam sim no thiab voltage cable ntoo khaub lig seem yog xaiv los ntawm tus saib-up lub rooj. Cov tables yog heev nrig txog kev pom thiab tsis tau paub piav qhia txog. Koj thawj xaiv cov hlau khoom: tooj liab los yog txhuas, thiab ces cov mov voltage thiab tus nqi ntawm cov tam sim no yog txiav txim los ntawm lub cable ntoo khaub lig-section.

Ntawm no, ua tau, peb ntsia li cas los xam qhov hluav taws xob load thiab xaiv tus ntoo khaub lig-seem ntawm lub cables rau electrification tej yaam num.