Cov cuab yeej tiv thaiv kev kub ntxhov (SPD) ua haujlwm li cas

Cov khoom tiv thaiv hluav taws xob, tseem hu uacov khoom siv tiv thaiv hluav taws xob (SPD), yog cov khoom tseem ceeb hauv txhua lub tshuab hluav taws xob. Lawv ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv cov khoom siv hluav taws xob rhiab heev los ntawm cov teebmeem puas tsuaj ntawm cov hluav taws xob nce siab thiab cov hluav taws xob luv luv. Hauv tsab xov xwm no, peb yuav tshawb nrhiav seb cov khoom tiv thaiv hluav taws xob nce siab ua haujlwm li cas thiab cov ntsiab cai tom qab lawv ua haujlwm li cas.

Hauv lub ntsiab lus yooj yim tshaj plaws, tus tiv thaiv surge txwv qhov transient voltage thiab hloov cov tam sim no rov qab mus rau nws qhov chaw lossis hauv av thaum muaj voltage transient tshwm sim ntawm lub voj voog tiv thaiv. Qhov no ua tiav los ntawm kev siv tsawg kawg ib qho khoom nonlinear uas hloov pauv ntawm cov xeev impedance siab thiab qis nyob rau hauv ntau yam xwm txheej. Thaum lub sijhawm ua haujlwm voltage ib txwm muaj, tus tiv thaiv surge tseem nyob hauv lub xeev impedance siab thiab tsis cuam tshuam rau lub kaw lus. Txawm li cas los xij, thaum muaj voltage transient tshwm sim, tus tiv thaiv surge nkag mus rau hauv lub xeev conductive (lossis impedance qis) thiab hloov cov tam sim no surge rov qab mus rau nws qhov chaw lossis hauv av, ua rau txwv lossis clamping lub voltage mus rau qib nyab xeeb dua. Thaum lub transient dhau lawm, tus tiv thaiv surge yuav rov pib dua mus rau nws lub xeev impedance siab.

Ib lub cuab yeej tiv thaiv hluav taws xob muaj tsawg kawg ib qho khoom tsis yog kab xws li lub varistor lossis lub qhov hluav taws xob uas nws qhov kev tiv thaiv hloov pauv raws li lub zog hluav taws xob siv hla nws. Cov khoom no yog tsim los hloov cov hluav taws xob tawm lossis cov hluav taws xob pulse thiab txwv cov hluav taws xob overvoltages hauv cov khoom siv downstream. Thaum lub sijhawm ua haujlwm ib txwm, lub cuab yeej tiv thaiv hluav taws xob tsis muaj kev cuam tshuam rau lub kaw lus thiab ua haujlwm zoo li lub voj voog qhib, tswj kev sib cais ntawm tus neeg ua haujlwm thiab lub ntiaj teb. Txawm li cas los xij, thaum muaj hluav taws xob surge tshwm sim, lub cuab yeej tiv thaiv hluav taws xob surge txo nws cov impedance thiab hloov cov hluav taws xob surge hauv ob peb nanoseconds. Nws ua haujlwm zoo li lub voj voog kaw, luv luv overvoltages thiab txwv lawv mus rau qib uas cov khoom siv hluav taws xob txuas nrog downstream txais tau.

Lub hauv paus ntsiab lus ua haujlwm ntawm cov khoom tiv thaiv hluav taws xob yog qhov tseem ceeb hauv kev tiv thaiv cov kab ke hluav taws xob thiab hluav taws xob los ntawm cov teebmeem puas tsuaj ntawm kev nce hluav taws xob. Thaum koom ua ke rau hauv lub kaw lus hluav taws xob, cov khoom tiv thaiv hluav taws xob muab kev tiv thaiv txhim khu kev qha tiv thaiv cov xwm txheej ib ntus uas yuav ua rau cov khoom siv tsis ua haujlwm, lub sijhawm tsis ua haujlwm, thiab kev kho kim heev. Los ntawm kev hloov pauv thiab txwv cov hluav taws xob ntau dhau, cov khoom tiv thaiv hluav taws xob pab ua kom ntseeg tau tias cov khoom siv rhiab heev ua haujlwm txuas ntxiv, ua rau muaj kev ntseeg siab ntxiv thiab txo cov nqi kho.

Xaus lus, cov khoom tiv thaiv hluav taws xob, lossis SPDs, yog cov khoom tseem ceeb uas muab kev tiv thaiv tseem ceeb rau cov tshuab hluav taws xob thiab hluav taws xob. Los ntawm kev nkag siab txog lub hauv paus ntsiab lus ua haujlwm ntawm cov khoom tiv thaiv hluav taws xob, nws pom tseeb tias lawv ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv cov khoom siv los ntawm cov teebmeem puas tsuaj ntawm lub zog hluav taws xob thiab cov xwm txheej ib ntus. Nrog lawv lub peev xwm los txwv cov hluav taws xob ntau dhau thiab hloov cov hluav taws xob tam sim no, cov khoom tiv thaiv hluav taws xob yog qhov tseem ceeb hauv kev ua kom ntseeg tau tias kev ua haujlwm txuas ntxiv thiab kev ntseeg tau ntawm cov khoom siv rhiab heev. Yog li ntawd, kev koom ua ke cov khoom tiv thaiv hluav taws xob rau hauv cov tshuab hluav taws xob yog ib txoj hauv kev siv tau zoo thiab pheej yig los txo cov kev pheej hmoo cuam tshuam nrog lub zog hluav taws xob thiab cov xwm txheej ib ntus.