Hauv cov khoom siv hlau thiab cable, cov qauv thaiv thaiv tau muab faib ua ob lub ntsiab lus sib txawv: electromagnetic shielding thiab hluav taws xob tiv thaiv hluav taws xob. Electromagnetic shielding feem ntau yog siv los tiv thaiv cov kab hluav taws xob ntau zaus (xws li RF cables thiab hluav taws xob cables) los ntawm kev cuam tshuam rau sab nraud ib puag ncig lossis los thaiv cov hluav taws xob sab nraud los ntawm kev cuam tshuam nrog cov cables xa cov hluav taws xob tsis muaj zog (xws li cov teeb liab thiab ntsuas cov kab hluav taws xob), nrog rau txo kev cuam tshuam ntawm cov cables. Hluav taws xob tiv thaiv, ntawm qhov tod tes, yog tsim los sib npaug ntawm cov hluav taws xob muaj zog ntawm tus neeg xyuas pib nto lossis rwb thaiv tsev ntawm nruab nrab- thiab high-voltage fais fab cables.
1. Cov qauv thiab cov kev xav tau ntawm Cov Hluav Taws Xob Field Shielding Txheej
Lub shielding ntawm lub hwj chim cables yog muab faib ua conductor shielding, rwb thaiv tsev shielding, thiab hlau shielding. Raws li cov qauv tsim nyog, cov cables uas muaj qhov ntsuas hluav taws xob ntau dua 0.6 / 1 kV yuav tsum muaj cov txheej txheem hlau thaiv, uas tuaj yeem siv rau cov tub ntxhais insulated lossis tag nrho cov tub ntxhais cable. Rau cov cables uas muaj qhov ntsuas hluav taws xob tsawg kawg ntawm 3.6 / 6 kV siv XLPE (cross-linked polyethylene) rwb thaiv tsev, lossis cables nrog qhov ntsuas hluav taws xob tsawg kawg ntawm 3.6 / 6 kV siv nyias EPR (ethylene propylene roj hmab) rwb thaiv tsev (lossis tuab rwb thaiv tsev nrog cov ntsuas hluav taws xob tsawg kawg ntawm 6/10 kV sab hauv thiab sab nrauv).
(1) Tus neeg xyuas pib tiv thaiv thiab rwb thaiv tsev thaiv
Conductor Shielding (Inner Semi-Conductive Shielding): Qhov no yuav tsum tsis yog-hlau, muaj cov khoom siv extruded semi-conductive lossis ib qho kev sib txuas ntawm cov ntaub nplaum uas qhwv ib ncig ntawm tus neeg xyuas pib ua raws li cov khoom siv extruded semi-conductive.
Rwb thaiv tsev Shielding (Outer Semi-Conductive Shielding): Qhov no yog ncaj qha extruded mus rau sab nrauv ntawm txhua tus tub ntxhais insulated thiab yog nruj nreem khi rau los yog peelable los ntawm rwb thaiv tsev txheej.
Lub extruded sab hauv thiab sab nrauv semi-conductive khaubncaws sab nraud povtseg yuav tsum tau nruj nreem khi rau lub rwb thaiv tsev, nrog ib tug du interface tsis muaj cov neeg xyuas pib stranding marks, ntse npoo, hais, scorching, los yog khawb. Lub resistivity ua ntej thiab tom qab kev laus yuav tsum tsis pub tshaj 1000 Ω·m rau cov neeg xyuas pib shielding txheej thiab tsis pub ntau tshaj 500 Ω·m rau lub rwb thaiv tsev shielding txheej.
Cov ntaub thaiv npog sab hauv thiab sab nrauv yog tsim los ntawm kev sib xyaw cov khoom siv insulating (xws li cross-linked polyethylene (XLPE) thiab ethylene propylene roj hmab (EPR)) nrog cov khoom ntxiv xws li carbon dub, tshuaj tiv thaiv kev laus, thiab ethylene-vinyl acetate copolymer. Cov pa roj carbon dub yuav tsum tau muab faib ua tus sib npaug hauv cov polymer, tsis muaj agglomeration lossis tsis zoo dispersion.
Lub thickness ntawm sab hauv thiab sab nraud semi-conductive shielding txheej nce nrog qhov ntsuas qhov ntsuas hluav taws xob. Txij li thaum lub zog hluav taws xob ntawm lub rwb thaiv tsev txheej yog siab dua rau sab hauv thiab sab nraud, lub thickness ntawm semi-conductive shielding khaubncaws sab nraud povtseg yuav tsum thicker nyob rau hauv sab hauv thiab thinner nyob rau sab nraud. Rau cov kab hluav taws xob ntsuas ntawm 6 ~ 10 ~ 35 kV, txheej txheej sab hauv feem ntau yog li ntawm 0.5 ~ 0.6 ~ 0.8 hli.
(2) Hlau thaiv
Cables uas muaj qhov ntsuas hluav taws xob ntau dua 0.6 / 1 kV yuav tsum muaj txheej txheej hlau thaiv. Cov hlau thaiv txheej yuav tsum npog sab nraud ntawm txhua qhov insulated core lossis cov tub ntxhais cable. Hlau shielding tuaj yeem muaj ib lossis ntau dua hlau tapes, hlau braids, concentric khaubncaws sab nraud povtseg ntawm hlau nyob ntawm tej, los yog ib tug ua ke ntawm hlau xov hlau thiab tapes.
Nyob rau hauv cov teb chaws Europe thiab cov teb chaws tsim, qhov kev tiv thaiv-grounded dual-circuit systems yog siv thiab luv-circuit tam sim no siab dua, tooj liab hlau shielding feem ntau ua hauj lwm. Nyob rau hauv Suav teb, arc suppression coil-grounded ib-circuit fais fab mov tshuab muaj ntau dua, yog li tooj liab daim kab xev shielding feem ntau yog siv. Cable manufacturers txheej txheem muas tawv tooj liab tapes los ntawm slitting thiab annealing kom soften lawv ua ntej siv. Cov ntaub nplaum mos yuav tsum ua raws li GB / T11091-2005 "Copper Tapes rau Cables" tus qauv.
Copper daim kab xev shielding yuav tsum muaj ib txheej ntawm overlapped mos tooj liab daim kab xev los yog ob txheej ntawm gap-wrapped mos tooj liab daim kab xev. Qhov nruab nrab sib tshooj yuav tsum yog 15% ntawm daim kab xev dav, nrog qhov sib tshooj tsawg kawg ntawm tsis pub tsawg tshaj 5%. Lub nominal thickness ntawm daim kab xev tooj liab yuav tsum tsis pub tsawg tshaj 0.12 hli rau ib leeg-core cables thiab tsis pub tsawg tshaj 0.10 hli rau multi-core cables. Qhov tsawg kawg nkaus thickness yuav tsum tsis pub tsawg tshaj 90% ntawm nominal tus nqi.
Copper xaim shielding muaj xoob xoob xoob xoob xoob xoob xoob xoob xoob, nrog rau qhov chaw ruaj ntseg los ntawm rov qab qhwv cov xov tooj tooj liab lossis cov kab xev. Nws qhov kev tiv thaiv yuav tsum ua raws li GB / T3956-2008 "Cov Neeg Siv Hluav Taws Xob ntawm Cables" tus qauv, thiab nws qhov nominal ntu ntu yuav tsum txiav txim siab raws li qhov muaj peev xwm tam sim no.
2. Kev ua haujlwm ntawm cov ntaub thaiv npog thiab lawv cov kev sib raug zoo nrog cov kev ntsuas hluav taws xob
(1) Muaj nuj nqi ntawm Sab hauv thiab sab nrauv Semi-Conductive Shielding
Cable conductors feem ntau yog ua los ntawm ntau txoj hlua khi thiab sib khi. Thaum lub sij hawm rwb thaiv tsev extrusion, qhov khoob hauv zos, burrs, los yog qhov tsis sib xws ntawm qhov chaw ntawm tus neeg xyuas pib thiab cov txheej txheem rwb thaiv tsev tuaj yeem ua rau cov hluav taws xob hauv hluav taws xob, ua rau cov paug tawm ib nrab thiab cov ntoo tawm, uas ua rau cov hluav taws xob ua haujlwm tsis zoo. Los ntawm extruding ib txheej ntawm cov khoom siv semi-conductive (conductor shielding) ntawm tus neeg xyuas pib saum npoo thiab txheej rwb thaiv tsev, nws tuaj yeem ua kom nruj nrog cov rwb thaiv tsev. Txij li cov txheej txheem semi-conductive nyob ntawm tib lub peev xwm raws li tus neeg xyuas pib, txhua qhov sib txawv ntawm lawv yuav tsis muaj kev cuam tshuam hluav taws xob, yog li tiv thaiv ib nrab tawm.
Ib yam li ntawd, qhov sib txawv ntawm cov rwb thaiv tsev sab nrauv thiab cov hlau sheath (los yog hlau thaiv) kuj tuaj yeem ua rau cov paug tawm ib nrab, tshwj xeeb tshaj yog nyob rau ntawm qhov ntsuas hluav taws xob ntau dua. Los ntawm extruding ib txheej ntawm cov khoom siv hluav taws xob (cov ntaub thaiv hluav taws xob tiv thaiv) rau ntawm qhov chaw rwb thaiv tsev sab nrauv, nws tsim ib qho chaw equipotential nrog cov hlau sheath, tshem tawm cov hluav taws xob hauv hluav taws xob hauv qhov khoob thiab tiv thaiv ib feem ntawm qhov paug tawm.
(2) Kev ua haujlwm ntawm cov hlau thaiv kev tiv thaiv
Lub luag haujlwm ntawm cov hlau thaiv kev tiv thaiv muaj xws li: ua cov capacitive tam sim no nyob rau hauv ib txwm muaj, ua txoj hauv kev rau luv-circuit (fault) tam sim no, confining hluav taws xob teb nyob rau hauv lub rwb thaiv tsev (txo electromagnetic cuam tshuam rau sab nraud ib puag ncig), thiab xyuas kom meej uniform hluav taws xob teb (radial hluav taws xob teb). Nyob rau hauv peb-theem plaub-xaim tshuab, nws kuj ua raws li cov kab nruab nrab, nqa cov dej tsis sib npaug, thiab muab cov dej tsis zoo radial.
3. Hais txog OW Cable
Raws li ib tug ua lag luam ntawm raw cov ntaub ntawv rau hlau thiab cable, OW Cable muab high-zoo cross-linked polyethylene (XLPE), tooj liab tapes, tooj liab xov hlau, thiab lwm yam ntaub ntawv shielding lug siv nyob rau hauv kev tsim hluav taws xob cables, kev sib txuas lus cables, thiab tshwj xeeb cables. Peb cov khoom ua tau raws li cov qauv thoob ntiaj teb, thiab peb tau cog lus tias yuav xa cov kev daws teeb meem kev ruaj ntseg cable rau peb cov neeg siv khoom.
Post lub sij hawm: Mar-24-2025