Txoj Cai Hloov Kev Siv Hluav Taws Xob Hluav Taws Xob Tiv Thaiv
Surge Protective Device (SPD), tseem hu ua Surge Protector, yog ib qho khoom siv tiv thaiv uas tsis yog siv nyob rau hauv cov tshuab nyob kom txwv tsis pub dhau qhov hluav taws xob dhau mus thiab qhia tawm qhov hluav taws xob tam sim no. Nws yog siv los tiv thaiv hluav taws xob lossis hluav taws xob uas tsis tshua muaj hluav taws xob tiv taus theem los ntawm xob laim ntaus, electromagnetic pulses lossis kev ua haujlwm overvoltage puas tsuaj. Nyob rau hauv xyoo tas los no, hluav taws xob cov ntaub ntawv xov xwm (xws li TV, xov tooj, kev sib txuas lus, computer network, thiab lwm yam) tau tsim sai heev, thiab cov khoom siv hluav taws xob ntau tau tshwm sim thiab nrov. Cov hom tshuab thiab cov cuab yeej siv no feem ntau kim thiab tseem ceeb, nrog rau kev ua haujlwm tsis tshua muaj hluav taws xob thiab tiv taus qhov hluav taws xob, ua rau lawv muaj kev cuam tshuam rau xob laim hluav taws xob pulses. Yog li, SPD yuav tsum tau siv rau kev tiv thaiv overvoltage.
Vim yog cov qauv sib txawv ua raws li cov teb chaws sib txawv, cov khoom tshwj xeeb ntawm cov khoom tsis sib koom ua ke, thiab kev txheeb xyuas cov kev ntsuas kuj tseem muaj lawv tus kheej qhov tseem ceeb, uas yog qhov qis dua rau lwm cov khoom siv hluav taws xob tshwj xeeb, uas ua rau muaj kev tsis yooj yim rau kev tsim thiab xaiv. Hauv kev tsim qauv engineering, cov hom lag luam feem ntau tuaj yeem muab faib ua cov khoom lag luam hauv tsev, cov khoom lag luam European, thiab cov khoom lag luam Asmeskas raws li lawv qhov chaw nyob. Cov kev teeb tsa ntawm cov khoom siv hauv tsev yog chaotic, nrog ntau yam specifications thiab siab residual voltage. Qee cov qauv khoom tsim tau tsim los ua raws li cov khoom lag luam European, thaum lwm tus ua raws li cov qauv hauv tebchaws. Cov khoom lag luam feem ntau yog sau nrog In thiab Imax. Vim tias qhov kev xav tau ntawm cov khoom siv hauv tsev tsis tshua muaj rau cov chaw thov, qib tsev qis, thiab cov khoom siv siab tiv taus qhov ntsuas hluav taws xob, qee qhov kev txwv tsis pub tuaj yeem ua kom haum.
Cov khoom lag luam nyob sab Europe feem ntau sau nrog qhov siab tshaj plaws tawm tam sim no, thiab cov qauv khoom kuj tau teeb tsa raws li qhov ntsuas no. Piv txwv li, lub npe nrov European hom XXX65 thiab XXX40, qhov twg qhov tseem ceeb ntawm 65 thiab 40 yog Imax. Txawm li cas los xij, Suav cov qauv qhia meej meej hais tias qhov nominal tso tawm tam sim no nyob rau hauv yuav tsum tau siv rau kev xaiv, uas yog qhov teeb meem tsis txaus ntseeg tau ntsib hauv engineering tsim tam sim no. Tom qab kuaj xyuas cov ntaub ntawv ntawm cov khoom, tus nqi ntawm XX65 tsis tshaj 20kA, thiab hauv tus nqi ntawm XX40 tsis tshaj 15kA. Yog tias cov txiaj ntsig tau pom zoo ntawm GB50343 tau ua raws, ob yam khoom no tsuas yog siv tau rau kev tiv thaiv peb theem tom kawg ntawm cov khoom siv. Txawm li cas los xij, hauv kev tsim qauv tiag tiag, lawv tau teeb tsa rau qib thib ib thiab thib ob, uas yog qhov tsis txaus ntseeg nrog cov kev xaiv ntawm lub teb chaws tus qauv, thiab qhov seem voltage yog siab. Cov qauv qub feem ntau tshaj 1200V. Thaum qhov chaw xaim tsis zoo, nws yog ib qho yooj yim kom dhau cov khoom siv tiv thaiv tus nqi hluav taws xob. Feem ntau, cov khoom lag luam nyob sab Europe muaj tus nqi Uc me me thiab muaj lub sijhawm zoo rau kev sau cov kab hluav taws xob, ua kom yooj yim rau kev dag ntxias thaum xaiv cov qauv.
Lub hauv paus ntsiab lus ua haujlwm ntawm SPD
Lub surge protector yog tsim rau kev tiv thaiv ntawm 220/380V low-voltage fais fab mov thiab yog ib tug nonlinear tivthaiv. Raws li IEC cov qauv, lub surge protector yog ib qho cuab yeej siv los tswj cov overvoltage thiab overcurrent ntawm cov kab sib kis. Lub hauv paus yuav tsum tau rau ib tug surge protector los ua ib tug tiv thaiv lub luag hauj lwm yog kom tiv thaiv tau cov kev cia siab ntawm xob laim tam sim no thiab zoo tua hluav taws xob zaus tam sim no generated tom qab lub xob laim ntws los ntawm lub siab tshaj plaws clamping voltage ntawm lub surge. Nws txwv lub tam sim no overvoltage uas nkag mus rau hauv lub hwj chim kab los yog cov teeb liab kis tau tus mob kab mus rau lub voltage ntau yam uas cov cuab yeej los yog lub cev muaj peev xwm tiv taus, los yog tso tawm hluav taws xob muaj zog tam sim no rau hauv av los tiv thaiv cov khoom tiv thaiv los yog system ntawm kev puas tsuaj los ntawm kev cuam tshuam.
Hom thiab cov qauv ntawm surge protectors sib txawv raws li lawv cov kev siv sib txawv, tab sis lawv muaj tsawg kawg yog ib qho kev txwv tsis pub muaj hluav taws xob. Feem ntau siv surge protectors muaj xws li MOVs (MetalOxideVaristors) thiab gas paug hlab. Cov hluav taws xob muaj zog muaj zog thiab tsis tuaj yeem nres. Vim li no, lub tswv yim los tiv thaiv cov khoom siv hluav taws xob tsis zoo los ntawm kev puas tsuaj los ntawm kev puas tsuaj yog hloov cov surge ntawm cov khoom siv thiab ntws mus rau hauv av.
Lub surge protector MOV muaj peb ntu: cov khoom siv hlau oxide nyob rau hauv nruab nrab, txuas los ntawm ob lub semiconductors rau lub hwj chim mov thiab av xaim. Thaum qhov tshwm sim tshwm sim, MOV tam sim ua nrog lub sijhawm teb ntawm 1-3 nanoseconds. Lub "V" hauv MOV yog rheostat. Thaum lub sijhawm teb, qhov kev tiv thaiv ntawm MOV poob los ntawm nws cov nqi siab tshaj plaws mus rau yuav luag xoom ohms, thiab overcurrent ntws mus rau hauv av los ntawm MOV. Cov khoom siv hluav taws xob tiv thaiv txuas ntxiv ua haujlwm ntawm qhov kev ua haujlwm ib txwm muaj. Nws cov khoom siv hluav taws xob semiconductor muaj cov cuab yeej hloov pauv nrog cov kev hloov hluav taws xob. Thaum qhov hluav taws xob poob qis dua tus nqi tshwj xeeb, kev txav ntawm cov hluav taws xob hauv cov khoom siv hluav taws xob ua kom muaj zog. Ntawm qhov tsis sib xws, thaum qhov hluav taws xob ntau tshaj qhov tshwj xeeb no, cov lus tsa suab ntawm cov hluav taws xob yuav hloov, thiab cov khoom siv hluav taws xob yuav txo qis rau zero ohms. Qhov hluav taws xob yog qhov qub, thiab lub zog tiv thaiv MOV tsis ua haujlwm ntawm sab, tsis cuam tshuam rau cov kab hluav taws xob.
