Shielding cable muaj thaiv ob lo lus, raws li lub npe qhia yog kis tau tus mob cable nrog sab nraud electromagnetic cuam tshuam tsis kam tsim los ntawm shielding txheej. Qhov hu ua "shielding" ntawm cov qauv cable kuj yog ib qho kev ntsuas los txhim kho kev faib hluav taws xob. Tus neeg xyuas pib ntawm lub cable yog tsim los ntawm ntau cov hlua ntawm cov hlau, uas yog ib qho yooj yim los tsim cov huab cua sib txawv ntawm nws thiab cov rwb thaiv tsev txheej, thiab tus neeg xyuas pib nto tsis du, uas yuav ua rau cov concentration ntawm hluav taws xob teb.
1. Cable shielding txheej
(1). Ntxiv ib txheej shielding ntawm semi-conductive khoom nyob rau saum npoo ntawm tus neeg xyuas pib, uas yog equipotential nrog shielded neeg xyuas pib thiab nyob rau hauv kev sib cuag zoo nrog lub rwb thaiv tsev txheej, thiaj li tsis txhob ib feem ntawm tus neeg xyuas pib thiab cov rwb thaiv tsev txheej. Cov txheej txheem tiv thaiv no tseem hu ua txheej thaiv sab hauv. Tej zaum kuj yuav muaj qhov sib txawv ntawm qhov sib txuas ntawm cov rwb thaiv tsev thiab cov ntaub qhwv, thiab thaum lub cable yog khoov, cov roj-daim ntawv cable rwb thaiv tsev nto yog ib qho yooj yim ua rau tawg, uas yog ib feem ua rau cov paug tawm.
(2). Ntxiv ib txheej shielding ntawm semi-conductive khoom nyob rau saum npoo ntawm rwb thaiv tsev txheej, uas muaj kev sib cuag zoo nrog cov ntaub thaiv npog txheej thiab muaj peev xwm sib npaug nrog cov hlau sheath, kom tsis txhob muaj ib feem ntawm cov rwb thaiv tsev txheej thiab cov sheath.
Txhawm rau kom sib npaug ntawm cov tub ntxhais thiab rwb thaiv tsev hluav taws xob, 6kV thiab siab dua nruab nrab thiab siab hluav taws xob fais fab cables feem ntau muaj cov ntaub thaiv npog thiab cov txheej thaiv insulating, thiab qee qhov hluav taws xob qis tsis muaj ntaub thaiv npog. Muaj ob hom shielding txheej: semi-conductive shielding thiab hlau shielding.
2. shielded cable
Lub shielding txheej ntawm no cable yog feem ntau braided rau hauv ib tug network ntawm hlau xov hlau los yog ib tug hlau zaj duab xis, thiab muaj ntau yam kev sib txawv ntawm ib tug shielding thiab ntau shielding. Ib daim ntaub thaiv npog yog hais txog ib daim ntaub thaiv npog los yog ntaub thaiv npog zaj duab xis, uas tuaj yeem qhwv ib los yog ntau cov xov hlau. Kev tiv thaiv ntau hom yog ntau qhov kev tiv thaiv kev sib txuas, thiab cov yeeb yaj kiab tiv thaiv yog nyob rau hauv ib lub cable. Qee qhov yog siv los cais cov electromagnetic cuam tshuam ntawm cov xov hlau, thiab qee qhov yog ob txheej thaiv thaiv siv los ntxiv dag zog tiv thaiv cov nyhuv. Lub mechanism ntawm shielding yog rau hauv av txheej shielding kom cais cov induced cuam tshuam voltage ntawm sab nraud hlau.
(1) Semi-conductive shielding
Cov ntaub thaiv npog semi-conductive feem ntau yog txheej txheej txheej txheej txheej ntawm cov hlau xaim hluav taws xob thiab sab nrauv ntawm cov txheej txheem insulating, uas yog hu ua sab hauv semi-conductive shield txheej thiab txheej txheej semi-conductive shield raws li. Cov txheej txheem semi-conductive shielding yog tsim los ntawm cov khoom siv semi-conductive uas tsis tshua muaj siab thiab nyias tuab. Sab hauv semi-conductive shielding txheej yog tsim los ua kom cov hluav taws xob zoo nyob rau sab nrauv ntawm tus neeg xyuas pib thiab tsis txhob cuam tshuam ib feem ntawm tus neeg xyuas pib thiab rwb thaiv tsev vim qhov tsis sib xws ntawm tus neeg xyuas pib thiab cov huab cua sib txawv los ntawm cov tub ntxhais stranded. Cov txheej txheej semi-conductive shielding yog nyob rau hauv kev sib cuag zoo nrog cov txheej txheej txheej rwb thaiv tsev, thiab yog equipotential nrog cov hlau sheath kom tsis txhob muaj ib feem paug nrog cov hlau sheath vim yog tsis xws luag xws li cov kab nrib pleb ntawm lub rwb thaiv tsev cable.
(2) Hlau thaiv
Rau nruab nrab thiab qis voltage fais fab cables tsis muaj hlau tsho, ib txheej hlau thaiv yuav tsum tau ntxiv ntxiv rau ib tug semi-conductive shield txheej. Cov hlau thaiv txheej feem ntau yog qhwv los ntawmdaim kab xevlos yog tooj liab hlau, uas feem ntau plays lub luag hauj lwm ntawm shielding hluav taws xob teb.
Vim hais tias tam sim no los ntawm lub hwj chim cable kuj loj, lub magnetic teb yuav raug generated nyob ib ncig ntawm lub tam sim no, thiaj li tsis mus cuam tshuam rau lwm yam, yog li lub shielding txheej yuav tiv thaiv no electromagnetic teb nyob rau hauv cable. Tsis tas li ntawd, cov kab thaiv kab thaiv txheej tuaj yeem ua lub luag haujlwm hauv kev tiv thaiv hauv av. Yog tias cov tub ntxhais cable puas lawm, cov xau tam sim no tuaj yeem ntws raws li cov ntaub thaiv npog laminar ntws, xws li cov hauv paus hauv av, ua lub luag haujlwm hauv kev tiv thaiv kev nyab xeeb. Nws tuaj yeem pom tias lub luag haujlwm ntawm cov ntaub thaiv npog cable tseem yog qhov loj heev.
Post lub sij hawm: Sep-19-2024