1. Kev txhais
Cable ampacity yog qhov siab tshaj plaws kev nyab xeeb txuas ntxiv tam sim no ib lub cable tuaj yeem nqa tau raws li qhov ntsuas kub thiab kev teeb tsa, thaum tuav tus neeg xyuas pib qhov kub thiab txias nyob rau hauv qhov kev txwv qhov tso cai. Nws tsuas yog siv rau kev ruaj khov- lub xeev ntev- lub sijhawm ua haujlwm, tsis suav nrog kev pib ua haujlwm tam sim no thiab luv luv - lub sijhawm hloov pauv tam sim no.
2. Muaj feem cuam tshuam
Ampacity tsis yog tus nqi ruaj khov. Nws txawv nrog cov cua kub dissipation tej yam kev mob thiab cable specifications:
- Tus neeg xyuas khoom siv & Loj: Copper muaj ampacity ntau dua li txhuas; Cov ntoo khaub lig loj dua -section txhim kho lub peev xwm tam sim no.
- Rwb thaiv tsev ntsuas: High-kub resistant rwb thaiv tsev (XLPE) tso cai rau siab nruam tam sim no dua li PVC zoo tib yam.
- Ambient Kub: Siab dua ambient kub txo cov cua kub dissipation thiab txo qis ampacity zoo.
- Txoj Kev Txhim Kho: Dawb- huab cua tso ua kom txias kom zoo. Conduit, multi-cable stacking thiab tray installation ua rau kub tsub zuj zuj thiab derate ampacity.
- Av Thermal Resistance: Cov av qhuav thiab ntom ntom ua rau cov cua sov dissipation thiab txo cov ampacity rau faus cables.
- AC / DC qhov sib txawv: Cov nyhuv AC ntawm daim tawv nqaij thiab qhov sib thooj cuam tshuam txo qhov chaw ua haujlwm zoo, ua rau qis qis dua DC kev ua haujlwm.
3. Txuj kev suav txheej txheem
Engineering ampacity xam raws li nram noIEC 60287 (TSI)thiabGB/T 16895, siv lub hauv paus ampacity multiplied los ntawm ib puag ncig thiab layout kho yam.
Formula
I_allow=I_base * K1 * K2 * K3 * K4
Kev piav qhia Parameter
- Ib_base: Standard puag ampacity nyob rau hauv zoo tagnrho ib zaug -cable free- huab cua.
- K₁: Ambient kub kho qhov tseem ceeb.
- K₂: Multi-cable parallel layout correction factor.
- K₃: Npog / stacked installation kho qhov tseem ceeb.
- K₄: Av thermal kuj thiab faus qhov tob kho qhov tseem ceeb.
Qhov kho kom haum ampacity yuav tsum tau tshaj qhov siab tshaj plaws nruam load tam sim no. Luv- Circuit Court thermal stability yuav tsum tau txheeb xyuas nyias.
4. Cov Lus Qhia
- Ampacity txhais tau ntev - lub sij hawm tsis tu ncua kev nyab xeeb txwv, tsis yog rau kev pib ua haujlwm tsis tu ncua lossis overload tam sim no.
- Tag nrho cov nqi ampacity yog cov xwm txheej-raws li. Txhua qhov layout lossis ib puag ncig hloov pauv yuav tsum tau suav rov qab.
- Kev xaiv ampacity raug zam kom tsis txhob muaj cov kab hluav taws xob overheating, rwb thaiv tsev degradation, thiab hluav taws kub.
