Lub Luag Haujlwm ntawm Cov Tshuaj Antioxidants hauv Kev Txhim Kho Lub Neej ntawm Cross-Linked Polyethylene (XLPE) Insulated Cables
Cov polyethylene txuas nrog (XLPE)yog cov khoom siv rwb thaiv tsev tseem ceeb siv rau hauv cov xov hluav taws xob nruab nrab thiab siab. Thoob plaws lawv lub neej ua haujlwm, cov xov hluav taws xob no ntsib ntau yam teeb meem, suav nrog kev hloov pauv huab cua, kev hloov pauv kub, kev ntxhov siab ntawm lub tshuab, thiab kev sib cuam tshuam tshuaj lom neeg. Cov yam no ua ke cuam tshuam rau kev ruaj khov thiab lub neej ntev ntawm cov xov hluav taws xob.
Qhov Tseem Ceeb ntawm Cov Tshuaj Antioxidants hauv XLPE Systems
Yuav kom ntseeg tau tias cov cables XLPE-insulated muaj lub neej ntev, kev xaiv cov tshuaj antioxidant tsim nyog rau lub kaw lus polyethylene yog qhov tseem ceeb heev. Cov tshuaj antioxidants ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv polyethylene tiv thaiv kev puas tsuaj oxidative. Los ntawm kev cuam tshuam sai nrog cov free radicals tsim nyob rau hauv cov khoom siv, cov tshuaj antioxidants tsim cov tshuaj 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
Raws li lub sijhawm dhau mus, feem ntau cov polymers maj mam ua brittle vim yog kev puas tsuaj tas mus li. Lub sijhawm kawg ntawm lub neej rau cov polymers feem ntau yog txhais tias yog qhov chaw uas lawv qhov ntev thaum tawg txo qis mus rau 50% ntawm tus nqi qub. Tshaj qhov ntsuas no, txawm tias me ntsis khoov ntawm lub cable tuaj yeem ua rau tawg thiab ua tsis tiav. Cov qauv thoob ntiaj teb feem ntau siv cov qauv no rau polyolefins, suav nrog cross-linked polyolefins, los ntsuas kev ua tau zoo ntawm cov khoom siv.
Arrhenius Qauv rau Kev Kwv Yees Lub Neej Cable
Feem ntau piav qhia txog kev sib raug zoo ntawm qhov kub thiab lub neej ntawm cov xov hlau siv Arrhenius equation. Tus qauv lej no qhia txog qhov nrawm ntawm kev tshuaj lom neeg raws li:
K= D e(-Ea/RT)
Qhov twg:
K: Tus nqi tshuaj tiv thaiv tshwj xeeb
D: Tsis tu ncua
Ea: Lub zog ua kom muaj zog
R: Boltzmann roj tas li (8.617 x 10-5 eV/K)
T: Qhov kub thiab txias kiag li hauv Kelvin (273+ Temp hauv °C)
Rov kho dua algebraically, qhov equation tuaj yeem qhia tau ua ib daim ntawv linear: y = mx + b
Los ntawm cov kab zauv no, lub zog ua kom muaj zog (Ea) tuaj yeem tau los ntawm kev siv cov ntaub ntawv graphical, ua rau muaj kev kwv yees meej txog lub neej cable hauv ntau yam xwm txheej.
Kev Ntsuas Kev Laus Sai Dua
Yuav kom paub tseeb tias cov xov hlau XLPE-insulated siv tau ntev npaum li cas, cov qauv kuaj yuav tsum tau kuaj xyuas kom sai li sai tau ntawm qhov kub thiab txias sib txawv tsawg kawg yog peb (zoo dua plaub) qhov kub thiab txias sib txawv. Cov kub no yuav tsum muaj ntau yam txaus los tsim kom muaj kev sib raug zoo ntawm lub sijhawm mus rau qhov tsis ua haujlwm thiab kub. Qhov tseem ceeb, qhov kub thiab txias qis tshaj plaws yuav tsum ua rau lub sijhawm nruab nrab mus txog qhov kawg tsawg kawg yog 5,000 teev kom ntseeg tau tias cov ntaub ntawv kuaj raug.
Los ntawm kev siv txoj hauv kev no thiab xaiv cov tshuaj antioxidants ua tau zoo, kev ntseeg tau ntawm kev ua haujlwm thiab lub neej ntev ntawm XLPE-insulated cables tuaj yeem txhim kho tau zoo heev.
Lub sijhawm tshaj tawm: Lub Ib Hlis-23-2025