Izixhobo zokukhusela izixhobo zokukhetha
Njengoko wonke umntu esazi, izixhobo zokukhusela okanye izixhobo zokukhusela (SPD) zikhusela izixhobo zombane ngokuchasene nemibane ebangelwe ngumbane. Oko kwathethi, akusoloko kulula ukwazi ukuba yeyiphi oyikhethayo.
Ukukhetha ukubanjwa ngokufanelekileyo kwesekethe kunye neesekethe ezikhuselayo kubandakanya ukuthathela ingqalelo uluhlu olubanzi lweeparameter ezinxulumene neendidi zezixhobo zokukhusela, amalungiselelo esekethe kunye nokuvavanywa komngcipheko.
Masizame ukubona izinto ngokucacileyo…
Ngenisa ifom, ufumane okungakumbi ngesixhobo sokhuselo (i-Circuit Breaker okanye iFuse) enxulunyaniswa nesiXhobo soKhuseleko esiSebenzayo.
Okokuqala, imigangatho yangoku ichaza iindidi ezintathu zezixhobo zokukhusela ukufakelwa kombane ophantsi:
Zeziphi izixhobo zokukhusela ezinokukhethwa kwaye kufuneka zifakelwe phi?
Ukukhuselwa kombane kufuneka kusondele kumbono ngokubanzi. Kuxhomekeke kwisicelo (izityalo ezikhulu zemizi-mveliso, amaziko edatha, izibhedlele, njl. Imigaqo kazwelonke, nangaphezulu, inokuyenza inyanzeliswe ukusebenzisa umgangatho we-EN 62305-2 (uvavanyo loMngcipheko).
Ngamanye amaxesha (izindlu, iiofisi, izakhiwo ezingathathelwa ngqalelo kwimingcipheko yezamashishini), kulula ukwamkela lo mthetho-siseko ukhuselekileyo:
Kuzo zonke iimeko, uhlobo lwesibini lokuzikhusela luza kufakelwa kwibhodi yokufaka yombane engenayo. Emva koko, umgama phakathi kweso sixhobo sokukhusela kunye nezixhobo eziza kukhuselwa kufuneka zihlolwe. Xa lo mgama ungaphezulu kweemitha ezingama-2, isixhobo esongeziweyo sokhuselo (Uhlobo 30 okanye Uhlobo 2) kufuneka sifakelwe kufutshane nezixhobo.
Ubungakanani besixhobo sokukhusela izixhobo?
Emva koko, ubungakanani bohlobo 2 lwezixhobo zokukhusela zixhomekeka ikakhulu kwindawo yokuvezwa (ngokuphakathi, ngokuphakathi, phezulu): kukho iindlela ezahlukeneyo zokukhutshwa kudidi ngalunye (Imax = 20, 40, 60 kA (8 / 20μs)).
Kuhlobo loku-1 lwezixhobo zokukhusela, eyona mfuno iphantsi kukukhutshwa kwe-Iimp = 12.5 kA (10 / 350μs). Amaxabiso aphezulu anokufuneka kuvavanyo lomngcipheko xa kucelwa oku kulandelayo.
Ungazikhetha njani izixhobo ezikhuselayo ezinxulumene nezixhobo zokukhusela?
Okokugqibela, isixhobo sokhuselo esinxulunyaniswa nesixhobo sokukhusela (isekethe okanye umlo weesekethe) siya kukhethwa ngokuhambelana nesekethe yangoku kwindawo yofakelo. Ngamanye amagama, indawo yokuhlala yeswitshi yombane, isixhobo sokhuselo esine-ISC <6 kA iya kukhethwa.
Kwizicelo zeofisi, iSC ngokubanzi <20 kA.
Abavelisi kufuneka babonelele ngetafile yolungelelwaniso phakathi kwesixhobo sokukhusela isixhobo kunye nesixhobo esihambelana nokhuseleko. Ngakumbi nangakumbi izixhobo zokukhusela esele zibandakanya esi sixhobo sokukhusela kwindawo efanayo.
Umgaqo wokukhetha owenziwe lula (ngaphandle kovavanyo olupheleleyo lomngcipheko)
