TusFeem ntau ua rau cov cable tsis ua haujlwm thoob plaws ob qho hluav taws xob thiab cov ntaub ntawv \/ xov tooj \/ telecom cables yog dej noo noo.
Ntawm no yog vim li cas nws thiaj li nthuav dav thiab ua rau:
Ub tu hniav:Cables tau teeb tsa txhua qhov chaw - hauv qab dej, hauv qab, hauv qab dej, hauv cov tsev av qab zib, thiab dej xau tuaj yeem tshwm sim. Nws yog qhov nyuaj heev rau tag nrho cov noo noo ntau xyoo ntawm kev pabcuam lub neej.
Ntau lub tshuab ua haujlwm:Dej tsis ua rau tsis ua hauj lwm ib txoj kev; Nws ua ntau cov txheej txheem rhuav tshem:
Kev Nyab Xeeb:Dej corrodes me me me me (tooj liab, txhuas) thiab cov duab thaiv \/ armor, nce ntau me ntsis, thiab thaum kawg nws tsoo tus neeg xyuas pib. Electrolytic corrosion ntawm kev sib cais ntawm cov metimimilar me me tau nrawm.
Rwb thaiv tsev puas:Feem ntau rwb thaiv tsev cabuliving (zoo li XLPE, PVC, ntawv) degrades thaum raug dej. Dej "ntoo" (dendritic micro-channel) tuaj yeem ua rau hauv cov hluav taws xob taug qab thiab tshwm sim luv luv voj voog. Daim ntawv rwb thaiv tsev poobes dielectric zog.
O & delamination:Qee cov ntaub ntawv rwb thaiv tsev nqus dej, swell, thiab poob lawv cov neeg kho tshuab thiab insulating cov khoom. Cov dej tseem tuaj yeem ua rau cov khaubncaws sab nraud povtseg hauv cable (rwb thaiv tsev, seevon hlau) mus rau Delaminate.
Khov \/ thaw Cycles:Cov dej daig hauv cov nrib pleb lossis conduit tuaj yeem khov, nthuav dav, thiab ua rau kev puas tsuaj rau cab tshuab.
Kev Pab Cov Paths:Dej muab txoj hau kev ua raws cov chaw nyob nrog rau kev ua si cable lossis ntawm tus cwj pwm, coj mus rau to taub hau, taug qab, thiab luv.
Feem ntau txuas rau lwm yam laj thawj:Dej ingress nquag tshwm simvimntawm lwm qhov teeb meem thawj zaug:
Mechanical mob:Tus Nick, txiav, zuaj, lossis kev ua kom pom kev thaum lub sijhawm teeb tsa lossis kev ua haujlwm ua txhaum lub hnab riam sab nraud, cia dej nyob hauv.(Cov tshuab puas tsuaj nws tus kheej yog qhov ze tshaj plaws thib ob vim li cas.
Kev teeb tsa tsis zoo:Kev rub tawm tsis yog, ntau dhau los yog khoov, tsis muaj kev txiav tawm ntawm cov kev txiav tawm lossis pob qij txha, lossis rov qab ua kom cov ntsiab lus nkag.
Kev tsis txaus ntseeg ntawm lub tsho hnav tsho \/ sheath:Sij hawm dhau los, UV kis tau, tshuaj lom neeg, lossis thermal cycling tuaj yeem ua rau cov cable txheej txheem tiv thaiv sab nraud (sheath), ua rau nkab thiab permeable rau noo noo.
Lwm cov ua rau muaj feem ntau (feem ntau cuam tshuam nrog dej):
Mechanical mob:Raws li tau hais los saum toj no. Nrog rau kev khawb kev puas tsuaj ("khawb-ins"), zuaj, puas tsuaj, cov tsiaj rog ntau dhau (nas), thiab kev puas tsuaj thaum nruab nrab.
Thermal degradation \/ overloading:Kev ua haujlwm ntawm cov cable saum toj nws cov ntsuas kub (vim tias muaj cua sov ntau ntxiv, ua rau muaj kev kub ntxhov siab, ua rau muaj kev tawg ua kom nrawm dua (uas tau ua rau dej hauv).
Kev ntxhov siab hluav taws xob:Overvolhatages (xob laim tawm tsam, hloov surges) muaj peev xwm pungeture rwb thaiv tsev ncaj qha.
Tshuaj lom neeg raug:Roj, cov kuab tshuaj, acids, alkalis, ozone, lossis corrosive xau tuaj yeem tawm tsam rwb thaiv tsev lossis cov ntaub ntawv sheathing.
Kev ua haujlwm tsis zoo (kev txiav tawm & pob qij txha):Feem ntau ntawm cov cable tsis tshwm sim ntawm cov kev sib txuas lossis kev txiav vim yog kev sib xyaw ua ke, ua rau cov khoom siv noo noo (ua kom cov ntsiab lus noo noo), lossis cov ntsiab lus rwb thaiv tsev.
Vim li cas dej kav ua ntej:
Thaum kev puas tsuaj hluav taws xob yuav yog thawj zauglub sijhawm, Water ingress yog qhov feem ntaukev uaQhov kawg uas ua rau hluav taws xob tsis ua hauj lwm ntawm lub sijhawm. Nws yog qeeb, pervasive, thiab complex kev tsis muaj kev cuam tshuam rau yuav luag txhua qhov chaw thiab cuam tshuam nrog ze li lwm yam tsis ua tiav.
Kev Tiv Thaiv Kev Tiv Thaiv:Cable tsim (robust ya raws li cov nyom, zam kev ua kom muaj dej nyab, thiab kev tiv thaiv kev ua kom zoo nkauj)
