Nov yog 3-kauj ruam qhia ua koj xaiv.
1. Xaiv hom raug (qhov chaw)
SPDs raug cais los ntawm qhov chaw lawv tau nruab rau hauv koj lub cev. Rau cov chaw lag luam, txoj hauv kev cascaded yog qhov tseem ceeb.
· Hom 1 (Main Entrance): Muab tso rau ntawm lub rooj faib khoom loj lossis kev pabcuam nkag. Tsim los daws cov surges loj heev los ntawm cov hluav taws xob ncaj qha (10/350 µs waveform). Yuav tsum tau yog lub tsev muaj kev tiv thaiv hluav taws xob sab nraud (LPS) lossis raug pub los ntawm cov kab nyiaj siv ua haujlwm.
· Hom 2 (Sub-Kev faib tawm): Muab tso rau hauv cov chaw faib khoom. Kov qhov seem surges thiab sab hauv generated switching surges (8/20 µs waveform). Qhov no yog cov pob txha ntawm kev tiv thaiv kev lag luam rau cov chaw tswj lub cev muaj zog thiab cov ceg ntoo.
· Hom 3 (Point- ntawm-Siv): Nruab ze li sai tau rau cov khoom siv rhiab heev (xws li, PLCs, VFDs, computers). Muab "kev tiv thaiv zoo" rau cov khoom siv hluav taws xob me me tom qab qhov kev nce siab loj dua twb tau clamped los ntawm cov khoom siv hluav taws xob.
Kev Pom Zoo Tseem Ceeb: Feem ntau cov kev lag luam surges (tshaj 80%) yog tsim los ntawm kev hloov cov motors loj lossis VFDs. Hom 2 thiab 3 SPDs yog qhov tseem ceeb rau cov xwm txheej niaj hnub no.
2. Qhov tseem ceeb Parameters los ntsuas
Thaum sib piv SPDs, tsom rau cov kev ntsuas no kom ntseeg tau tias koj lub cev muaj qhov loj me thiab nyab xeeb.
· Voltage Protection Rating (VPR / Up): Qhov no yog qhov "cia- dhau" voltage- qhov siab tshaj qhov hluav taws xob tiv thaiv yuav pom. Qhov qis dua yog qhov zoo dua rau cov iav rhiab heev.
· Nominal Discharge Tam Sim No (Nyob rau hauv): Lub surge tam sim no SPD tuaj yeem ua haujlwm ntau zaus yam tsis ua tsis tiav. Qhov siab dua "Nyob rau hauv" feem ntau txhais tau hais tias lub cuab yeej muaj zog dua.
· Qhov Tshaj Tawm Tshaj Tawm Tshaj Tawm Tshaj Tawm (Imax): Ib qho kev nce siab tshaj plaws ntawm SPD tuaj yeem tiv taus ib zaug yam tsis muaj kev puas tsuaj.
· Qhov siab tshaj qhov ua haujlwm tsis tu ncua (MCOV / Uc): Qhov siab tshaj plaws nyob ruaj khov- lub xeev qhov hluav taws xob SPD tuaj yeem ua tau. Nws yuav tsum siab tshaj koj qhov system nominal voltage (xws li, 480V) kom tsis txhob muaj kev cuam tshuam tsis zoo.
· Short Circuit Current Rating (SCCR): Qhov no yuav tsum siab tshaj qhov luv luv -circuit tam sim no ntawm lub installation taw tes kom ntseeg tau tias SPD disconnects yam xyuam xim thaum kawg- ntawm- lub neej.
3. Siv lub hauv paus ntsiab lus "Cascading".
Rau kev tiv thaiv ruaj khov, siv "3-2-1 Txoj Cai Ntawm Tus ntiv tes xoo" rau kev ntsuas tam sim no ntawm ntau qib:
· Kev Nkag Mus Nkag (Lub Ntsiab): Npaj rau ~ 300kA ib theem.
· Faib Vaj Huam Sib Luag: Npaj rau ~ 200kA ib theem.
· Ceg Vaj Huam Sib Luag: Npaj rau ~ 100kA ib theem.
Qhov no ua kom lub zog loj yog dissipated nyob rau theem, txo kev ntxhov siab ntawm cov khoom siv qis.
Cov Lus Qhia Tseem Ceeb Pro
· Tsis txhob hnov qab cov kab teeb liab: Lub zog hluav taws xob tuaj yeem taug kev los ntawm cov ntaub ntawv kab, tswj cov teeb liab, thiab Ethernet cables. Tiv thaiv cov chaw nres nkoj sib txuas lus nrog cov teeb liab tshwj xeeb SPDs los tiv thaiv "tsis paub tsis meej".
· Nco ntsoov qhov nrug: Muab qhov SPD kom ze li qhov ua tau rau cov cuab yeej nws tiv thaiv (tsawg cable ntev). Ntev cable khiav tsim inductive voltage nco uas txo cov kev tiv thaiv zoo.
· Cov Teeb Meem Saib Xyuas: SPDs feem ntau yog kev txi. Nrhiav cov khoom siv nrog qhov kawg - ntawm - lub neej ntsuas kom paub thaum twg los hloov lawv.
Summary Checklist
1. Txheeb xyuas qhov pheej hmoo: Puas muaj hluav taws xob sab nraud? Puas yog lub vev xaib nyob hauv thaj chaw muaj kev pheej hmoo siab?
2. Layer the Defense: Xaiv Hom 1 (yog xav tau), Hom 2 (yuav tsum tau), thiab Hom 3 (sensitive loads).
3. Tshawb xyuas Compatibility: Xyuas kom SPD qhov voltage, SCCR, thiab disconnecting ntaus ntawv koom tes nrog koj lub vaj huam sib luag.
4. Tiv thaiv cov ntaub ntawv: Ib txwm ntxiv SPDs rau cov teeb liab thiab kev sib txuas lus.
Ua raws li IEC 61643-12 tus qauv yog qhov kev coj ua uas pom zoo los ua kom muaj kev ua raws cai thiab kev ntseeg tau ntawm lub cev.
Kuv vam tias phau ntawv qhia no yuav pab koj taug txoj kev xaiv. Yog tias koj tuaj yeem faib cov ntawv thov tshwj xeeb (xws li, PLC vaj huam sib luag, VFD, lossis lub ntsiab hloov pauv), Kuv tuaj yeem muab cov lus qhia tshwj xeeb rau cov kev ntsuas tshwj xeeb.