Tam sim no, cov khoom siv feem ntau sivcov khoom siv rwb thaiv tsevRau cov xov hlau DC yog polyethylene. Txawm li cas los xij, cov kws tshawb fawb pheej nrhiav cov ntaub ntawv rwb thaiv tsev ntau dua, xws li polypropylene (PP). Txawm li cas los xij, kev siv PP ua cov ntaub ntawv rwb thaiv tsev cable muaj ntau yam teeb meem.
1. Cov Khoom Siv Kho Tshuab
Yuav kom ua tau raws li qhov yuav tsum tau ua rau kev thauj mus los, kev teeb tsa, thiab kev ua haujlwm ntawm DC cables, cov khoom siv rwb thaiv tsev yuav tsum muaj qee lub zog kho tshuab, suav nrog kev ywj pheej zoo, kev ntev thaum tawg, thiab kev tiv thaiv kev cuam tshuam qis-kub. Txawm li cas los xij, PP, ua ib qho polymer crystalline heev, ua rau muaj kev ruaj khov hauv nws qhov kub ua haujlwm. Tsis tas li ntawd, nws qhia txog kev tawg thiab kev cuam tshuam rau kev tawg hauv qhov chaw kub qis, ua tsis tau raws li cov xwm txheej no. Yog li ntawd, kev tshawb fawb yuav tsum tsom mus rau kev ua kom tawv thiab hloov kho PP los daws cov teeb meem no.
2. Kev Tiv Thaiv Kev Laus
Thaum siv ntev, DC cable rwb thaiv tsev maj mam laus zuj zus vim yog cov teebmeem ntawm lub zog hluav taws xob siab thiab kev hloov pauv thermal. Qhov kev laus no ua rau txo qis cov khoom siv kho tshuab thiab rwb thaiv tsev, nrog rau kev txo qis lub zog tawg, thaum kawg cuam tshuam rau kev ntseeg tau thiab lub neej ua haujlwm ntawm cable. Kev laus ntawm cable rwb thaiv tsev suav nrog cov yam ntxwv kho tshuab, hluav taws xob, thermal, thiab tshuaj lom neeg, nrog rau kev laus hluav taws xob thiab thermal yog qhov txhawj xeeb tshaj plaws. Txawm hais tias kev ntxiv cov antioxidants tuaj yeem txhim kho PP txoj kev tiv thaiv rau kev laus thermal oxidative mus rau qee qhov, kev sib raug zoo tsis zoo ntawm cov antioxidants thiab PP, kev tsiv teb tsaws chaw, thiab lawv cov khoom tsis huv ua cov khoom ntxiv cuam tshuam rau PP txoj kev ua haujlwm rwb thaiv tsev. Yog li ntawd, kev cia siab rau cov antioxidants los txhim kho PP txoj kev tiv thaiv kev laus tsis tuaj yeem ua tau raws li lub neej thiab kev ntseeg tau ntawm DC cable rwb thaiv tsev, ua rau xav tau kev tshawb fawb ntxiv txog kev hloov kho PP.
3. Kev Ua Haujlwm Rwb Thaiv Tsev
Qhov chaw them nqi, ua ib qho ntawm cov yam tseem ceeb uas cuam tshuam rau qhov zoo thiab lub neej ntawmcov kab hluav taws xob DC siab, cuam tshuam loj heev rau qhov kev faib tawm ntawm lub zog hluav taws xob hauv zos, lub zog dielectric, thiab cov khoom siv rwb thaiv tsev laus. Cov khoom siv rwb thaiv tsev rau DC cables yuav tsum tiv thaiv kev sib sau ua ke ntawm qhov chaw them, txo qhov kev txhaj tshuaj ntawm cov nqi sib xws polarity, thiab cuam tshuam kev tsim cov nqi sib txawv polarity kom tiv thaiv kev cuam tshuam ntawm lub zog hluav taws xob hauv cov rwb thaiv tsev thiab cov interfaces, kom ntseeg tau tias lub zog tawg thiab lub neej ntawm cable tsis cuam tshuam.
Thaum cov xov hluav taws xob DC nyob hauv lub teb hluav taws xob unipolar rau lub sijhawm ntev, cov electrons, ions, thiab impurity ionization tsim tawm ntawm cov khoom siv electrode hauv cov rwb thaiv tsev ua qhov chaw them nqi. Cov nqi no sai sai tsiv mus rau hauv cov pob khoom them nqi, hu ua kev sib sau ua ke ntawm qhov chaw them nqi. Yog li ntawd, thaum siv PP hauv DC cables, kev hloov kho yog qhov tsim nyog los tiv thaiv kev tsim nqi thiab kev sib sau ua ke.
4. Kev Ua Kub
Vim tias cov thermal conductivity tsis zoo, cov cua sov uas tsim thaum lub sijhawm ua haujlwm ntawm PP-based DC cables tsis tuaj yeem ploj mus sai, ua rau muaj qhov sib txawv ntawm qhov kub thiab txias ntawm sab hauv thiab sab nraud ntawm cov txheej rwb thaiv tsev, tsim kom muaj qhov kub thiab txias tsis sib xws. Cov hluav taws xob conductivity ntawm cov khoom polymer nce ntxiv nrog rau qhov kub thiab txias nce. Yog li ntawd, sab nraud ntawm cov txheej rwb thaiv tsev nrog cov conductivity qis dua yuav yooj yim rau kev sib sau ua ke ntawm cov nqi, ua rau txo qis zog ntawm lub zog hluav taws xob. Ntxiv mus, qhov kub thiab txias ua rau muaj kev txhaj tshuaj thiab kev tsiv teb tsaws chaw ntawm ntau qhov chaw them, ua rau lub teb hluav taws xob cuam tshuam ntxiv. Qhov kub thiab txias ntau dua, qhov chaw them ntau dua tshwm sim, ua rau muaj kev cuam tshuam ntawm lub teb hluav taws xob. Raws li tau tham ua ntej, qhov kub thiab txias siab, kev sib sau ua ke ntawm qhov chaw them, thiab kev cuam tshuam ntawm lub teb hluav taws xob cuam tshuam rau kev ua haujlwm ib txwm thiab lub neej ua haujlwm ntawm DC cables. Yog li ntawd, kev txhim kho cov thermal conductivity ntawm PP yog qhov tsim nyog los xyuas kom meej tias kev ua haujlwm muaj kev nyab xeeb thiab lub neej ua haujlwm ntev ntawm DC cables.
Lub sijhawm tshaj tawm: Lub Ib Hlis-04-2024