Hauv txhua lub ces kaum ntawm lub neej niaj hnub no, cov khoom siv hluav taws xob ua haujlwm zoo li cov hlab ntsha tsis pom, thauj hluav taws xob mus rau ntau yam khoom siv hluav taws xob thiab txhawb kev ua haujlwm ntawm tib neeg kev vam meej. Cov pob khoom zoo li yooj yim ntawm cov xov hlau no muaj qhov tseem ceeb tshaj plaws hauv kev tshawb fawb- lawv tsis yog lub cev nruab nrab rau kev xa hluav taws xob xwb, tab sis kuj yog qhov tseem ceeb ntawm kev sib koom ua ke ntawm ntau yam ntawm electromagnetism, cov ntaub ntawv tshawb fawb, thiab hluav taws xob engineering. Los ntawm microscopic electron hloov mus rau macroscopic power grid systems, lub neej thiab kev ua kom zoo ntawm cov hluav taws xob cables cuam tshuam rau kev ua tau zoo thiab cov yam ntxwv uas tib neeg siv lub zog.
Lub cev muaj zog ntawm kev sib kis
Lub luag haujlwm tseem ceeb ntawm cov hluav taws xob cable yog txhawm rau ua kom muaj kev sib kis tau zoo ntawm hluav taws xob hluav taws xob. Raws li Ohm txoj cai (I =} V / R) thiab Joule txoj cai (Q=I²Rt), thaum tam sim no dhau los ntawm tus neeg xyuas pib, nws tsim hluav taws xob poob thiab kub poob. Qhov no yuav tsum tau hais tias lub hwj chim cable tsim tawm tsam qhov sib npaug ntawm conductivity, resistivity, thiab mechanical zog. Tooj thiab txhuas, raws li cov ntaub ntawv tseem ceeb ntawm tus neeg xyuas pib, yog qhov kev xaiv zoo tshaj plaws rau lawv cov khoom siv hluav taws xob siab thiab tus nqi pheej yig. Tooj liab muaj qhov kev tiv thaiv tsuas yog 1.68 × 10⁻⁸ Ω·m, thaum txhuas yog 2.82 × 10⁻⁸ Ω·m, ob qho tib si qis dua cov hlau xws li hlau. Qhov tshwm sim ntawm cov khoom siv superconducting tau nthuav dav ntxiv qhov kev txwv: hauv qab qhov kub thiab txias, qhov tsis kam ntawm qee cov ntaub ntawv (xws li yttrium barium tooj liab oxide) ploj tag, theoretically enabling lossless kis tau tus mob. Thaum tam sim no txwv los ntawm qhov tsis tshua muaj kub thiab cov nqi siab, lub tshuab no tau taw qhia txoj hauv kev rau yav tom ntej fais fab cable technology.
Electromagnetic compatibility (EMC) yog lwm qhov kev xav txog kev tshawb fawb tseem ceeb hauv kev tsim hluav taws xob cable. Fluctuating tam sim no tsim alternating magnetic teb, tsim electromagnetic cuam tshuam (EMI), uas tuaj yeem cuam tshuam rau kev ua haujlwm ib puag ncig ntawm cov khoom siv hluav taws xob. Cov kab hluav taws xob niaj hnub no muaj txiaj ntsig zoo tiv thaiv ob qho tib si - hom suab nrov thiab qhov sib txawv - hom kev cuam tshuam los ntawm kev sib tw - khub kev tsim kho, thaiv txheej (xws li aluminium ntawv ci lossis braided tooj liab mesh), thiab tsim nyog hauv av. Piv txwv li, txheej thaiv ntawm USB 3.0 cov ntaub ntawv cables tuaj yeem txo cov hluav taws xob kom qis dua 30 dB, ua kom ruaj khov siab -ceev teeb liab kis tau tus mob. Cov kab hluav taws xob tshwj xeeb tsim los rau cov khoom siv kho mob yuav tsum ua raws li IEC 60601-1-2 tus qauv, ua kom cov hluav taws xob sib nqus tsis pub dhau qhov txwv nruj kom ntseeg tau tias muaj kev nyab xeeb ntawm cov neeg mob.
Lub tsheb rau innovation nyob rau hauv cov ntaub ntawv science thiab engineering
Lub evolution ntawm fais fab cables yog qhov tseem ceeb ntawm keeb kwm ntawm kev nce qib hauv cov ntaub ntawv tshawb fawb. Cov khaubncaws sab nraud povtseg thiab lo lo ntxhuav thaum ntxov tau ua rau muaj kev laus thiab tawg, thaum niaj hnub hla - txuas polyethylene (XLPE) rwb thaiv tsev tuaj yeem tuav lub zog txhua yam thiab dielectric zog rau lub sijhawm ntev ntawm 90 degree. Nws lub zog tawg tuaj yeem ncav cuag 20-30 kV / mm, deb tshaj ntawm huab cua (3 kV / mm). Kev taw qhia ntawm nanocomposites tau hloov pauv cov txheej txheem rwb thaiv tsev ib txwm: ntxiv me me ntawm cov pa roj carbon nanotubes lossis montmorillonite rau polyethylene matrix tuaj yeem ua rau kom qhov chaw them nqi ntxiab ntom ntom ntawm cov txheej rwb thaiv tsev los ntawm qhov kev txiav txim ntawm qhov loj, zoo tiv thaiv kev puas tsuaj los ntawm ib feem ntawm qhov tso tawm.
Optimization ntawm tus neeg xyuas pib qauv kuj yog ib qho kev tshwm sim ntawm kev tshawb fawb. Twisting ntau cov xov tooj ntawm cov xov tooj zoo es tsis txhob siv ib tus neeg xyuas tuab tuab tsis tsuas yog txo qhov poob ntawm cov ntoo khaub lig zoo -sectional cheeb tsam tshwm sim los ntawm cov nyhuv ntawm daim tawv nqaij (qhov concentration ntawm tam sim no nyob rau saum npoo ntawm tus neeg xyuas pib ntawm lub siab zaus) tab sis kuj txhim khu kev yooj yim kom haum raws li cov kev xav tau ntawm kev sib txuas. Tesla pioneered siv ntau-strand twisted hlau nyob rau hauv nws cov AC fais fab system, hais txog lub efficiency bottleneck ntawm ntev -siv fais fab kis. Cov qauv coaxial ntawm niaj hnub siab - ceev cov ntaub ntawv cables (puab neeg xyuas pib - rwb thaiv tsev txheej - sab nrauv neeg xyuas pib - sheath) ua tiav ib txhij xa cov teeb liab thiab lub zog los ntawm electromagnetic shielding.
Social Impact on Energy Civilization
Los ntawm kev xav dav dav, cov kab hluav taws xob yog "capillaries" ntawm lub zog hauv internet. Daim phiaj hluav taws xob thoob ntiaj teb tso siab rau kaum tawm lab ntawm cov kab sib kis thiab cov kab xa tawm los tsim nws lub zog ntws network. Ultra-high voltage direct tam sim no (UHVDC) kis tau tus mob technology (xws li ± 1100 kV Jiquan Project) siv converter chaw nres tsheb thiab tshwj xeeb cables xa hluav taws xob huv si los ntawm cua thiab photovoltaic fais fab nroj tsuag nyob rau sab hnub poob kuv lub teb chaws nyob rau hauv 5,000 kilometers mus thauj cov chaw nyob rau sab hnub tuaj, ua kom poob qis dua 5%. Hauv ib lub tsev, tus qauv hom -C fais fab cable tuaj yeem nqa tau 100 W ntawm lub zog thiab 480 Mbps ntawm cov ntaub ntawv, txhawb kev sib txuas ntawm "lub zog + cov ntaub ntawv" thiab muab lub ntsaws- thiab- ua si lub zog cuam tshuam rau IoT cov khoom siv.
Kev tsim kev nyab xeeb ntawm cov fais fab cables tseem muaj feem cuam tshuam ncaj qha rau pej xeem kev nyab xeeb. Hluav taws xob hluav taws xob tshwm sim los ntawm kev puas tsuaj los ntawm rwb thaiv tsev thiab overheating account rau ntau tshaj 20% ntawm tag nrho cov hluav taws kub thoob ntiaj teb. Yog li ntawd, cov qauv xws li UL thiab IEC nruj me ntsis txhais cov tam sim no nqa peev xwm ntawm conductors (piv txwv li, 1.5 mm² tooj liab xaim muaj kev ruaj ntseg nqa 16 A), kub tsis kam (70℃rau standard cables, mus txog 150℃rau siab -kub cables), thiab nplaim retardancy (V-0 nyob rau hauv ntsug nplaim taws kuaj). Kev tshwm sim ntawm cov ntse fais fab cables (nrog kev sib xyaw tam sim no sensors thiab Circuit Court breakers) tuaj yeem ntes cov xwm txheej txawv txav hauv lub sijhawm tiag tiag thiab txiav tawm lub voj voog, ua ntej kev tiv thaiv kev pheej hmoo thiab kev tswj hwm.
Xaus: Los ntawm ib lub cuab yeej mus rau pem hauv ntej ntawm kev tshawb fawb
Fais fab cables yog ntau tshaj li "xaim"; lawv yog cov tsheb thev naus laus zis uas suav nrog kev txawj ntse ntawm ntau qhov chaw, suav nrog electromagnetic txoj kev xav, cov ntaub ntawv tshawb fawb, thiab cov tshuab engineering. Los ntawm Faraday qhov kev tshawb pom ntawm electromagnetic induction mus rau Maxwell qhov ua tiav ntawm qhov sib npaug ntawm electromagnetic teb, thiab los ntawm Edison txoj kev xa ncaj qha tam sim no mus rau Tesla lub ntiaj teb AC fais fab tuag, txhua qhov kev dhia mus rau hauv lub zog xa hluav taws xob thev naus laus zis tau nrog kev tsim kho tshiab hauv kev tsim hluav taws xob. Yav tom ntej, raws li thev naus laus zis xws li wireless charging thiab chav-kub superconductivity paub tab, cov hlua hluav taws xob yuav txuas ntxiv ua tiav lawv lub luag haujlwm hauv cov ntawv tshiab. Txawm li cas los xij, tsis muaj teeb meem li cas lawv hloov zuj zus, lawv qhov tseem ceeb ntawm kev tshawb fawb raws li lub hauv paus tseem ceeb txuas rau kev tsim hluav taws xob thiab kev siv hluav taws xob tseem yog lub hauv paus tseem ceeb ntawm tib neeg txoj kev taug mus rau qib siab ntawm kev vam meej.
