Sonke siyazi ukuthi akulula kakhulu ukukhetha idivayisi efanele yokuvikela ukuqhuma. Ipharamitha yedivayisi yokuzivikela yokudlula ayifani nepharamitha ye-smartphone ecacile futhi elula ukuyiqonda kubantu abaningi. Kuningi ukungaqondani uma ukhetha i-SPD.
Kokunye ukungaqondi kahle ukuthi inani elikhulu kakhulu lamanje (elilinganiswa ku-kA ngesigaba ngasinye), okungcono i-SPD. Kepha okokuqala, ake wethule ukuthi sisho ukuthini ngokuhlukumeza umthamo wamanje. I-Surge yamanje ngesigaba ngasinye yisilinganiso esiphezulu sokuhlinzwa samanje esingavinjelwa (ngesigaba ngasinye sedivaysi) ngaphandle kokwehluleka futhi kususelwa ku-IEEE standard 8 × 20 microsecond test waveform. Ukwenza isibonelo, lapho sikhuluma nge-100kA SPD noma i-200kA SPD. Sibhekisa kumandla alo asanda kufinyelela manje.
Umthamo wamanje ophakemeyo ungenye yemingcele ebaluleke kakhulu ye-SPD. Inikeza indinganiso yokuqapha idivaysi yokuvikelwa ehlukile yokuvikelwa. Futhi abakhiqizi be-SPD badinga ukuhlunga amandla okwenyuka kwamanje we-SPDs yabo. Futhi kumakhasimende, bayaqonda ukuthi i-SPD efakwe emnyango wokungena kufanele ibe nekhono eliphakeme lokukhuphuka kwamanje eliqhathanisa ne-SPD efakwe amapaneli egatsha.
Ngakho-ke nansi inkinga, abantu abaningi bakholelwa ukuthi i-200kA SPD ingcono kune-100kA SPD. Yini engalungile ngalo mbono?
Okokuqala, akubheki izindleko. Uma i-200kA SPD ibiza ngokufana ne-100kA SPD namanye amapharamitha ayafana, kufanele uthenge impela i-200kA SPD. Kodwa iqiniso ukuthi, i-200kA SPD ibiza ngaphezulu kunemodeli engu-100kA ngakho-ke kufanele sibala ukuthi ukuvikeleka okungeziwe okukuhlinzekayo kubiza imali eyengeziwe.
Okwesibili, i-200kA SPD ayidingekile ukuba ibe nesilinganiso sokuvikelwa kwe-voltage ephansi (VPR) kune-100kA SPD. I-VPR yimiqulu yokusala eyokwenza imishini kagesi ephansi.
Ngabe usho ukuthi umthamo we-SPD wamandla okwehla okwanele uwanele futhi i-SPD ene-kA enkulu kuphela imali yokuchitha imali.
Cha. Zingaki i-kA okufanele ukhethe ngokuyinhloko zixhomeke kuhlelo lokusebenza. Kungakhathaliseki ukuthi impahla evikelwe itholakala endaweni ephakeme, ephakathi noma ephansi yokuchayeka, ithinta usayizi we-SPD oyikhethayo.
I-IEEE i-C62.41.2 ichaza imikhakha ye-surges elindelekile ngaphakathi kwendawo.
- Isigaba C: Ukungena kwensizakalo, indawo enamandla kakhulu: 10kV, 10kA ukuphakama.
- Isigaba B: Ngaphansi, esingaphansi noma elingana no-30 ft kusuka esigabeni C, imvelo encane kakhulu: 6kV, 3kA ukuphakama.
- Isigaba A: Okuqhubekayo phansi, okukhulu noma okulingana no-60 ft kusuka esigabeni C, okungenani imvelo enamandla: 6kV, 0.5kA ukuphakama.
Ngakho uma unezimpahla endaweni ephakeme yokuchayeka, kungcono ngaso sonke isikhathi ukukhetha i-SPD enekhono elikhulu lokukhuphuka kwamanje ngoba ukuphakama kule ndawo kukhulu. Ngakho-ke ngingakhetha yini i-SPA engaphansi kakhudlwana endaweni ephakeme yokuchayeka. Ngokusemthethweni, ungakwazi. Kodwa inkinga ukuthi i-kA SPD encane izofika maduze ekupheleni kokuphila bese kufanele uthenge futhi ufake kabusha entsha. Izindleko zokugcina zingase zibe ngaphezulu kune-SPD ngokwayo.
Ngakho kuveza esinye isizathu sokusebenzisa i-kA SPD emikhulu. I-kA enkulu ye-SPA inempilo ende futhi ngaleyo ndlela isindise isikhathi kanye nezindleko zokondliwa. Isibonelo, ezinye iziteshi ze-telecom zisezindaweni ezikude noma ngisho nasezintabeni zezintaba. I-SPD evikela isikhungo esinjalo kufanele ibe nempilo ende kakhulu, kungcono ukuba isondlo sokuphila mahhala.
Isifinyezo
Kulesi sihloko, sixoxisana ngendaba yesikhundla samanje sokudlula lapho sikhetha i-SPD. Umthamo wamanje wokukhuphuka ophezulu we-SPD awunikeli isilinganiso sokuvikelwa komthamo ongcono (VPR) futhi ngezinye izikhathi akudingekile uma uthatha izindleko ezengeziwe.
Kodwa uma izimpahla zakho zitholakala endaweni ephezulu yokuchayeka noma umsebenzi wokulondoloza kunzima noma kuyabiza ukuqhuba, khona-ke i-SPA ephakeme kakhulu iyadingeka.