Lub luag haujlwm ntawm Antioxidants hauv Kev Txhim Kho Lub Neej Ntawm Hla-Txuas Polyethylene (XLPE) Insulated Cables
Hla-txuas polyethylene (XLPE)yog ib qho tseem ceeb insulating khoom siv nyob rau hauv nruab nrab thiab high-voltage cables. Thoob plaws hauv lawv lub neej ua haujlwm, cov cables no ntsib ntau yam kev sib tw, suav nrog kev hloov pauv huab cua, kub hloov pauv, kev ntxhov siab, thiab tshuaj lom neeg sib cuam tshuam. Cov yam tseem ceeb no koom ua ke cuam tshuam rau kev ua haujlwm ntev thiab ntev ntawm cov cables.
Qhov tseem ceeb ntawm Antioxidants hauv XLPE Systems
Txhawm rau kom muaj kev pabcuam txuas ntxiv mus rau XLPE-insulated cables, xaiv qhov tsim nyog antioxidant rau polyethylene system yog qhov tseem ceeb. Antioxidants ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv polyethylene tiv thaiv oxidative degradation. Los ntawm sai sai nrog cov dawb radicals tsim nyob rau hauv cov khoom, antioxidants tsim cov tebchaw ruaj khov dua, xws li hydroperoxides. Qhov no yog qhov tseem ceeb tshwj xeeb vim tias feem ntau cov txheej txheem sib txuas rau XLPE yog peroxide-based.
Cov txheej txheem degradation ntawm Polymers
Nyob rau tib lub sij hawm, feem ntau cov polymers maj mam ua nkig vim tsis tu ncua degradation. Qhov kawg-ntawm-lub neej rau cov polymers feem ntau txhais tau tias yog qhov taw tes ntawm lawv qhov elongation ntawm kev so txo mus rau 50% ntawm tus nqi qub. Tshaj li qhov pib no, txawm tias me me khoov ntawm lub cable tuaj yeem ua rau tawg thiab tsis ua haujlwm. Cov qauv thoob ntiaj teb feem ntau siv cov qauv no rau polyolefins, suav nrog kev sib txuas ntawm polyolefins, los ntsuas cov khoom siv.
Arrhenius Model rau Cable Life Prediction
Kev sib raug zoo ntawm qhov kub thiab txias ntawm cable lifespan feem ntau piav qhia siv qhov sib npaug Arrhenius. Cov qauv lej no qhia txog tus nqi ntawm cov tshuaj tiv thaiv tshuaj raws li:
K = D e(-Ea/RT)
Qhov twg:
K: Cov tshuaj tiv thaiv tshwj xeeb
D: Tsis tu ncua
Ea: Ua kom muaj zog
R: Boltzmann gas qhov tsis tu ncua (8.617 x 10-5 eV / K)
T: Qhov kub thiab txias hauv Kelvin (273 + Kub hauv ° C)
Rearranged algebraically, qhov sib npaug tuaj yeem qhia tau raws li kab ntawv: y = mx + b
Los ntawm qhov sib npaug no, lub zog ua kom muaj zog (Ea) tuaj yeem muab tau los ntawm cov ntaub ntawv graphical, ua rau kev kwv yees meej ntawm cable lub neej nyob rau hauv ntau yam xwm txheej.
Accelerated Aging Tests
Txhawm rau txiav txim siab txog lub neej ntawm XLPE-insulated cables, cov qauv kuaj yuav tsum tau ua kom nrawm dua qhov kev sim ntawm qhov tsawg kawg ntawm peb (xws li plaub) qhov sib txawv. Cov ntsuas kub no yuav tsum muaj qhov ntau txaus los tsim kom muaj kev sib raug zoo ntawm lub sij hawm-rau-tsis ua hauj lwm thiab kub. Qhov tseem ceeb, qhov ntsuas kub qis tshaj plaws yuav tsum ua rau lub sijhawm nruab nrab ntawm qhov kawg ntawm qhov tsawg kawg yog 5,000 teev los xyuas kom meej qhov siv tau ntawm cov ntaub ntawv xeem.
Los ntawm kev siv txoj hauv kev nruj no thiab xaiv cov tshuaj tiv thaiv kab mob ua haujlwm siab, kev ua haujlwm kev ntseeg tau thiab kev ua haujlwm ntev ntawm XLPE-insulated cables tuaj yeem txhim kho tau zoo.
Post lub sij hawm: Jan-23-2025