Dab tsi yog qhov kev sib raug zoo ntawm qhov chaw hla ntawm cov kab hluav taws xob thiab cov kab hluav taws xob tam sim no, thiab cov qauv kev suav yog dab tsi?

Cov xov hlau feem ntau hu ua "cables".Lawv yog cov nqa khoom rau kev xa hluav taws xob hluav taws xob thiab yog cov xwm txheej yooj yim rau kev tsim cov voj voog ntawm cov khoom siv hluav taws xob.Cov khoom tseem ceeb ntawm cov xaim xaim feem ntau yog ua los ntawm cov khoom siv tooj liab lossis txhuas.

Tus nqi ntawm cov xov hlau siv hauv cov ntawv thov sib txawv yog txawv.Piv txwv li, cov khoom siv hlau muaj txiaj ntsig tsis tshua siv los ua cov xov hlau.Cov hlau tseem tuaj yeem muab faib ua raws li kev thov.Piv txwv li, yog tias qhov tam sim no loj, peb yuav siv cov xaim hluav taws xob siab.

Yog li ntawd, cov xov hlau hloov tau yooj yim heev hauv kev siv tiag tiag.Yog li, thaum peb xaiv yuav, hom kev sib raug zoo uas tsis tuaj yeem tshwm sim ntawm txoj kab uas hla thiab qhov tam sim no.

Kev sib raug zoo ntawm txoj kab uas hla thiab tam sim no

Nyob rau hauv peb lub neej txhua hnub, cov xov hlau zoo sib xws yog nyias nyias.Yog vim li cas yog tias tam sim no lawv nqa thaum ua haujlwm tsawg heev.Nyob rau hauv lub hwj chim system, cov zis tam sim no ntawm qhov tsawg-voltage sab ntawm lub transformer feem ntau yog cov sum ntawm cov tam sim no siv los ntawm tus neeg siv, xws li los ntawm ob peb puas amperes mus rau ntau txhiab amperes.

Tom qab ntawd peb xaiv cov kab hlau loj loj kom tau raws li qhov muaj peev xwm overcurrent txaus.Obviously, txoj kab uas hla ntawm cov hlau yog proportional rau tam sim no, uas yog, qhov loj dua tam sim no, lub thicker lub cross-sectional cheeb tsam ntawm cov hlau.

Txoj kev sib raug zoo ntawm qhov chaw hla ntawm cov xaim thiab qhov tam sim no yog qhov pom tseeb heev.Lub peev xwm nqa tam sim no ntawm cov hlau tseem cuam tshuam nrog qhov kub thiab txias.Qhov siab dua qhov kub, qhov ntau dua qhov kev tiv thaiv ntawm cov hlau, qhov kev tiv thaiv ntau dua, thiab kev siv hluav taws xob ntau dua.

Yog li ntawd, nyob rau hauv cov nqe lus ntawm kev xaiv, peb sim xaiv ib tug hlau me ntsis loj dua cov rated tam sim no, uas yuav ua tau zoo zam qhov teeb meem saum toj no.

Qhov chaw hla ntawm cov hlau feem ntau yog xam raws li cov qauv hauv qab no:

Copper hlau: S = (IL) / (54.4 △U)

Aluminium hlau: S = (IL) / (34 △U)

Qhov twg: Kuv - Qhov siab tshaj plaws tam sim no dhau los ntawm cov xaim (A)

L - Ntev ntawm cov hlau (M)

△U - Tso cai poob qis (V)

S — Hla ntu ntawm cov xaim (MM2)

Tam sim no uas ib txwm tuaj yeem dhau los ntawm cheeb tsam hla ntawm cov xaim tuaj yeem raug xaiv raws li tag nrho cov nyiaj tam sim no nws yuav tsum tau ua, uas feem ntau tuaj yeem txiav txim siab raws li cov hauv qab no jingle:

Rhyme rau xaim hla ntu ntu thiab tam sim no

Kaum yog tsib, ib puas yog ob, ob tsib peb tsib plaub plaub peb ciam teb, xya caum cuaj tsib ob thiab ib nrab zaus, tooj liab hlau hloov kho kev suav

Rau cov xov hlau txhuas hauv qab 10 mm2, muab cov square millimeters los ntawm 5 kom paub qhov tam sim no ampere ntawm kev nyab xeeb load.Rau cov xov hlau saum toj no 100 square millimeters, muab qhov chaw hla ntu los ntawm 2;rau cov xov hlau hauv qab 25 square millimeters, muab 4;rau cov xov hlau siab tshaj 35 square millimeters, muab 3;rau cov xov hlau ntawm 70 thiab 95 square millimeters, muab 2.5.Rau cov xov tooj tooj liab, nce mus rau theem, piv txwv li, 2.5 square millimeters ntawm tooj liab hlau yog xam raws li 4 square millimeters.(Faj seeb: Cov saum toj no tsuas yog siv los ua kev kwv yees thiab tsis yog qhov tseeb heev.)

Tsis tas li ntawd, yog tias nws nyob hauv tsev, nco ntsoov tias rau cov xov tooj tooj liab nrog cov tub ntxhais hla ntu ntawm qhov tsawg dua 6 mm2, nws muaj kev nyab xeeb yog tias tam sim no ib square millimeter tsis tshaj 10A.

Tsis pub dhau 10 meters, tam sim no qhov ceev ntawm cov xaim yog 6A / mm2, 10-50 meters, 3A / mm2, 50-200 meters, 2A / mm2, thiab tsawg dua 1A / mm2 rau cov xov hlau siab tshaj 500 meters.Lub impedance ntawm cov hlau yog proportional rau nws ntev thiab inversely proportional rau nws txoj kab uas hla.Thov xyuam xim tshwj xeeb rau cov khoom siv hlau thiab cov kab uas hla ntawm cov xaim xaim thaum siv cov khoom siv hluav taws xob.Txhawm rau tiv thaiv cov tam sim no ntau dhau los ntawm overheating cov xov hlau thiab ua rau muaj kev sib tsoo.