Tam sim no, feem ntau sivcov khoom siv rwb thaiv tsevrau DC cables yog polyethylene. Txawm li cas los xij, cov kws tshawb fawb tseem tab tom nrhiav ntau cov ntaub ntawv rwb thaiv tsev, xws li polypropylene (PP). Txawm li cas los xij, siv PP ua cov khoom siv hluav taws xob cable nthuav tawm ntau yam teeb meem.
1. Mechanical Properties
Yuav kom ua tau raws li cov kev cai yooj yim 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 yam kev siv lub zog, nrog rau kev ua tau zoo, elongation ntawm kev tawg, thiab qhov kub thiab txias tsis kam. Txawm li cas los xij, PP, raws li cov khoom siv crystalline heev, nthuav tawm rigidity hauv nws qhov kub thiab txias ua haujlwm. Tsis tas li ntawd, nws qhia tau hais tias brittleness thiab susceptibility rau cracking nyob rau hauv qis-kub ib puag ncig, tsis ua raws li tej yam kev mob. Yog li ntawd, kev tshawb fawb yuav tsum tsom rau kev nruj thiab hloov kho PP los daws cov teeb meem no.
2. Kev laus tsis kam
Thaum siv mus ntev, DC cable rwb thaiv tsev maj mam muaj hnub nyoog vim muaj kev sib xyaw ua ke ntawm kev siv hluav taws xob siab thiab thermal cycling. Qhov kev laus no ua rau txo qis ntawm cov khoom siv hluav taws xob thiab rwb thaiv tsev, nrog rau kev txo qis ntawm kev tawg, thaum kawg cuam tshuam rau kev ntseeg siab thiab kev pabcuam lub neej ntawm cable. Cable rwb thaiv tsev laus muaj xws li txhua yam, hluav taws xob, thermal, thiab tshuaj lom neeg, nrog rau hluav taws xob thiab thermal aging yog feem ntau hais txog. Txawm hais tias ntxiv cov tshuaj antioxidants tuaj yeem txhim kho PP qhov kev tiv thaiv rau thermal oxidative kev laus rau qee qhov, tsis zoo sib xws ntawm antioxidants thiab PP, kev tsiv teb tsaws, thiab lawv cov impurity li additives cuam tshuam rau PP lub rwb thaiv tsev kev ua tau zoo. Yog li ntawd, tsuas yog tso siab rau cov tshuaj antioxidants los txhim kho PP qhov kev laus tiv thaiv tsis tuaj yeem ua tau raws li lub neej ntev thiab kev ntseeg tau ntawm DC cable rwb thaiv tsev, xav tau kev tshawb fawb ntxiv ntawm kev hloov kho PP.
3. Kev ua haujlwm rwb thaiv tsev
Qhov chaw them nqi, raws li ib qho ntawm cov yam ntxwv cuam tshuam rau qhov zoo thiab lub neej ntawmhigh-voltage DC cables, cuam tshuam rau hauv cheeb tsam hluav taws xob thaj chaw faib khoom, lub zog dielectric, thiab cov khoom siv rwb thaiv tsev laus. Rwb thaiv tsev cov ntaub ntawv rau DC cables yuav tsum tau txwv lub tsub zuj zuj ntawm qhov chaw them nqi, txo cov kev txhaj tshuaj ntawm zoo li-polarity qhov chaw tsub, thiab hinder lub tiam ntawm tsis zoo li-polarity qhov chaw tsub kom tiv thaiv hluav taws xob teb distortion nyob rau hauv lub rwb thaiv tsev thiab interfaces, kom ntseeg tau tias unaffected breakdown zog thiab cable lifespan.
Thaum DC cables tseem nyob hauv qhov chaw hluav taws xob unipolar rau lub sijhawm ntev, cov khoom siv hluav taws xob, ions, thiab impurity ionization tsim los ntawm cov khoom siv hluav taws xob hauv cov rwb thaiv tsev ua qhov chaw tsub. Cov tsub nqi no txav ceev ceev thiab sib sau ua ke rau hauv cov pob ntawv them nqi, hu ua tsub zuj zuj ntawm qhov chaw them nqi. Yog li ntawd, thaum siv PP hauv DC cables, kev hloov kho yog tsim nyog los txo cov nqi tsim thiab tsub zuj zuj.
4. Thermal conductivity
Vim tsis zoo thermal conductivity, tshav kub generated thaum lub sij hawm ua hauj lwm ntawm PP-raws li DC cables tsis tuaj yeem dissipate tam sim ntawd, ua rau qhov kub sib txawv ntawm sab hauv thiab sab nraud ntawm lub rwb thaiv tsev txheej, tsim kom muaj qhov kub tsis sib xws. Cov hluav taws xob conductivity ntawm cov ntaub ntawv polymer nce nrog nce kub. Yog li ntawd, sab nrauv ntawm lub rwb thaiv tsev txheej nrog qis conductivity dhau los ua tus nqi tsub zuj zuj, ua rau txo qis hluav taws xob siv. Tsis tas li ntawd, qhov kub thiab txias gradients ua rau kev txhaj tshuaj thiab tsiv teb tsaws ntawm ntau qhov chaw tsub, ntxiv distorting ntawm hluav taws xob teb. Qhov kub gradient ntau dua, qhov chaw them nqi ntau dua tshwm sim, ua kom lub zog hluav taws xob cuam tshuam. Raws li tau tham dhau los, qhov kub thiab txias, qhov chaw them nqi, thiab hluav taws xob cuam tshuam cuam tshuam rau kev ua haujlwm ib txwm muaj thiab kev pabcuam lub neej ntawm DC cables. Yog li ntawd, kev txhim kho cov thermal conductivity ntawm PP yog tsim nyog los xyuas kom meej lub lag luam muaj kev ruaj ntseg thiab ntev kev pab cuam lub neej ntawm DC cables.
Post lub sij hawm: Jan-04-2024