Hauv kev tsim hluav taws xob thiab kev hloov pauv, cov neeg ua haujlwm hluav taws xob feem ntau tsis paub yuav ua li cas xaiv qhov chaw hla ntawm cov kab hluav taws xob.Cov kws tshaj lij hluav taws xob yuav suav cov tam sim no raws li cov khoom siv hluav taws xob thiab xaiv qhov chaw hla ntawm lub cable yooj yim heev;Lub koom haum xaiv cov kab hla hla raws li tus kws kho hluav taws xob cov qauv;Kuv xav hais tias lawv cov kev paub yog cov tswv yim tab sis tsis yog scientific.Muaj ntau cov ntawv tshaj tawm hauv Is Taws Nem, tab sis lawv feem ntau tsis muaj kev paub txaus thiab nyuaj rau kev nkag siab.Niaj hnub no kuv yuav qhia rau koj ib tug scientific thiab yooj yim txoj kev rau xaiv cable cross-sectional cheeb tsam.Muaj plaub txoj hauv kev rau lub sijhawm sib txawv.
Xaiv raws li lub sijhawm ntev tso cai nqa peev xwm:
Txhawm rau kom muaj kev nyab xeeb thiab kev pab cuam lub neej ntawm lub cable, qhov kub ntawm lub cable tom qab lub hwj chim yuav tsum tsis txhob siab tshaj qhov kev tso cai rau kev khiav hauj lwm ntev, uas yog 70 degrees rau PVC insulated cables thiab 90 degrees rau cross-linked polyethylene. insulated cables.Raws li txoj cai no, nws yog qhov yooj yim heev los xaiv cov cable los ntawm kev saib lub rooj.
Muab piv txwv:
Lub peev xwm transformer ntawm lub Hoobkas yog 2500KVa thiab lub zog hluav taws xob yog 10KV.Yog tias cov kab txuas txuas txuas nrog polyethylene insulated cables tau siv los tso rau hauv tus choj, qhov chaw hla ntawm cov cables yuav tsum yog dab tsi?
Kauj Ruam 1: Xam cov ntsuas tam sim no 2500/10.5/1.732 = 137A
Kauj ruam 2: Txheeb xyuas phau ntawv xaiv cable kom paub,
YJV-8.7 / 10KV-3X25 nqa peev xwm yog 120A
YJV-8.7 / 10KV-3X35 nqa peev xwm yog 140A
Kauj Ruam 3: Xaiv YJV-8.7 / 10KV-3X35 cable nrog lub peev xwm nqa ntau dua 137A, uas tuaj yeem ua raws li qhov xav tau.Nco tseg: Txoj kev no tsis xav txog qhov yuav tsum tau muaj rau kev ruaj ntseg thiab thermal stability.
Xaiv raws li kev lag luam tam sim no ceev:
Txhawm rau kom nkag siab yooj yim ntawm kev lag luam tam sim no qhov ntom ntom, qhov chaw hla ntawm cov kab hluav taws xob cuam tshuam rau txoj kab peev thiab hluav taws xob poob.Txhawm rau txuag kev nqis peev, nws cia siab tias qhov chaw sib txuas ntawm cable yog me dua;txhawm rau txo qis hluav taws xob poob, nws tau cia siab tias qhov chaw sib txuas ntawm cable yog qhov loj dua.Raws li qhov kev txiav txim siab saum toj no, txiav txim siab qhov tsim nyog Qhov chaw hla ntawm lub cable yog hu ua thaj tsam kev lag luam hla ntu, thiab qhov sib thooj tam sim no yog hu ua kev lag luam tam sim no ntom ntom.
Txoj Kev: Raws li cov sijhawm ua haujlwm txhua xyoo ntawm cov khoom siv, saib lub rooj kom tau txais kev lag luam tam sim no ceev.Chav tsev: A / mm2
Piv txwv li: qhov ntsuas tam sim no ntawm cov khoom siv yog 150A, thiab lub sijhawm ua haujlwm txhua xyoo yog 8,000 teev.Dab tsi yog qhov chaw hla ntawm cov tub ntxhais tooj liab cable?
Raws li cov lus saum toj no C-1, nws tuaj yeem pom tias rau 8000 teev, kev lag luam ceev yog 1.75A / mm2.
S = 150/1.75 = 85.7A
Xaus: Lub cable hla ntu peb tuaj yeem xaiv raws li cov lus qhia tshwj xeeb yog 95mm2
Xaiv raws li thermal stability coefficient:
Thaum peb siv thawj thiab thib ob txoj hauv kev los xaiv lub cable hla ntu ntu, yog tias lub cable ntev heev, yuav muaj qee qhov voltage poob thaum lub sijhawm ua haujlwm thiab pib.Qhov hluav taws xob ntawm cov khoom siv sab nraud yog qis dua ib qho kev sib txawv, uas yuav ua rau cov cuab yeej ua kom sov.Raws li qhov yuav tsum tau ua ntawm "Kev Siv Hluav Taws Xob Hluav Taws Xob", qhov hluav taws xob poob ntawm 400V kab tsis tuaj yeem tsawg dua 7%, uas yog, 380VX7% = 26.6V.Cov qauv ntsuas hluav taws xob poob qis (tsuas yog cov hluav taws xob tiv thaiv hluav taws xob nkaus xwb suav nrog ntawm no):
U = I × ρ × L / SS = I × ρ × L / U
U voltage poob I yog qhov ntsuas tam sim no ntawm cov khoom siv ρ conductor resistivity S yog cable hla ntu L yog qhov ntev cable
Piv txwv: Qhov ntsuas tam sim no ntawm 380V cov cuab yeej yog 150A, siv cov tub ntxhais tooj liab cable (ρ ntawm tooj liab = 0.0175Ω.mm2 / m), qhov ntsuas hluav taws xob yuav tsum tsawg dua 7% (U = 26.6V), qhov ntev cable yog 600 meters, lub cable cross-sectional cheeb tsam S yog dab tsi??
Raws li cov qauv S = I × ρ × L / U = 150 × 0.0175 × 600 / 26.6 = 59.2mm2
Xaus: Cov kab hluav taws xob hla ntu yog xaiv li 70mm2.
Xaiv raws li thermal stability coefficient:
1. Thaum 0.4KV cables muaj kev tiv thaiv los ntawm cov cua hloov pauv, cov kab hluav taws xob dav dav tuaj yeem ua tau raws li qhov xav tau ntawm thermal stability thiab tsis tas yuav kuaj xyuas raws li txoj kev no.
2. Rau cov cables saum toj no 6KV, tom qab xaiv lub cable cross-sectional cheeb tsam siv txoj kev saum toj no, koj yuav tsum xyuas seb nws puas ua tau raws li cov thermal stability raws li cov qauv hauv qab no.Yog tias tsis yog, koj yuav tsum xaiv thaj tsam loj dua.
Formula: Smin = Id × √Ti/C
Ntawm lawv, Ti yog lub sij hawm tawg ntawm Circuit Court breaker, uas yog coj li 0.25S, C yog lub cable thermal stability coefficient, uas yog npaum li 80, thiab Id yog peb-theem luv-circuit tam sim no tus nqi ntawm lub system.
Piv txwv li: Yuav ua li cas xaiv lub cable cross-sectional cheeb tsam thaum lub kaw lus luv-circuit tam sim no yog 18KA.
Smin = 18000 × √0.25 / 80 = 112.5mm2
Xaus: Yog hais tias lub kaw lus luv luv tam sim no mus txog 18KA, txawm tias qhov ntsuas tam sim no ntawm cov khoom siv me me, lub cable hla ntu yuav tsum tsis pub tsawg dua 120mm2.
Email: sales@zhongweicables.com
Txawb/Whatspp/Wechat: +86 17758694970
Post lub sij hawm: Sep-13-2023
