A umephuli wojikelezosisixhobo sombane esisetyenziswa kakhulu kwiisekethe ze-AC. Imodeli yombane ngokubanzi yenziwe ngoqhagamshelwano olushukumayo, uqhagamshelwano olushukumayo kunye noqhagamshelwano olungashukumiyo. Kwisekethe, imodeli yombane inokunqumla unikezelo lombane, idibanise unikezelo lombane kwaye ikhusele izixhobo zombane. Ngokwesakhiwo sayo kunye nomgaqo wokusebenza, inokwahlulwahlulwa ibeiqhekeza lesekethe lesigaba esinye, i-circuit breaker enezigaba ezintathu kunyeiqhekeza lesekethe yomoya. I-circuit breaker, njengesixhobo sokuphazamisa phakathi kwesekethe yokulawula kunye nombane, idlala indima ebalulekileyo kwigridi yombane. Xa isekethe igcwele kakhulu, i-short circuit kunye nezinye iimpazamo, ukhuseleko lwesenzo sombane ngexesha elifanelekileyo luya kunqunyulwa, ukuze isekethe ivuleke ukukhusela ukhuseleko lomntu kunye nepropathi kunye nezinye izixhobo ekonakaleni. Ngoko keumephuli wojikelezoEsetyenziswa kakhulu kwinkqubo yamandla ikwabizwa ngokuba yi-"over-undervoltage protector" okanye "fuse". Omnye wemisebenzi ebalulekileyo kukucima ngokuzenzekelayo umbane xa kukho i-short circuit.
Umgaqo wokusebenza
Xa i-AC current ngokusebenzisa i-circuit breaker iqhagamshelana, i-electromagnetic drawback, iqhuba isenzo sendlela yokusebenza, ukuze i-circuit breaker ikhulule ukukhubeka, ngaloo ndlela inqumle i-circuit.
Enyanisweni, isixhobo sokulibazisa singongezwa ukuze isekethe ikwazi ukunqanyulwa kuphela emva kokuba umsebenzi wokutshintsha ugqityiwe ngexesha elimiselweyo.
Xa umsinga we-short-circuit udlula kwi-circuit breaker, isinyithi esikufutshane nendawo edibana nayo siyanyibilika kwaye sitsalwe kukukhululwa kobushushu ngenxa yamandla e-arc kinetic kunye nobushushu obukhulu obuveliswa kukunyibilika kwendawo edibana nayo, ngaloo ndlela kunqunyulwa umsinga.
Xa iswitshi yombane ivaliwe okanye isekethe eqhagamshelwe kuyo ingaphumeleli, i-circuit breaker ingaphula isekethe ngexesha elifutshane.
Ngokwesimo sesakhiwo, yahlulwe yaba zizinto ezisisigxina, ezihambayo nezixhonyiweyo ezintathu.
Ngokwendlela yokukhululwa, imo yokukhupha yahlulwe yaba ziifom ezimbini zesandla kunye nezombane.
Ngokwendlela yokusebenza, iintlobo ezimbini zingahlulwa zibe kukudluliselwa kwebhanti kunye nokudluliselwa okungekho bhanti;
Ulwahlulo
(1)Iziphuli zeseketheinokwahlulwa ibe yigumbi lokuphazamisa i-vacuum (VHV), isango lokuphazamisa i-arc (AVR), ukukhutshwa kwe-vacuum (VSD) kunye nesixhobo sokudibanisa i-vacuum ngokwendlela ye-arc interrupter.
(2) Ii-circuit breakers zinokwahlulwa zibe ziintlobo ezintathu: i-single-phase circuit breaker, i-three-phase circuit breaker kunye ne-air circuit breaker.
(3) Iziphuli-moya zinokwahlulwa zibe ziintlobo ezimbini, i-AC kunye ne-DC, ngokwendlela abasebenzisi kunye neendawo ezahlukeneyo zokusetyenziswa.
(4) I-circuit breaker inokudityaniswa ne-air capacitor bank, i-air inductor kunye nezinye izixhobo zombane ngokwendlela yokufakela, kwaye ingasetyenziswa njengesixhobo sombane esikhuselayo.
(5) Zahlulwe zibe ludidi lokhuseleko olugqithisileyo, uhlobo lokhuseleko olufutshane kunye nohlobo lokhuseleko olungaphantsi kombane ngokweempawu zazo zokhuseleko.
(6) Kukho i-100V series general-purpose air voltage kunye ne-current grades ngokwe-voltage yazo elinganisiweyo kunye ne-current values.
Ipharamitha yeenkcukacha
Uhlobo lwe-circuit breaker lufana nolwezinye izixhobo zombane, njengekhowudi eyenziwe ngoonobumba "P", "Y" kunye neenombolo zeswitshi zokusasaza, kunye nekhowudi eyenziwe ngoonobumba "C" kunye neenombolo zeswitshi zemela, njl.njl., kodwa imisebenzi kunye nolwakhiwo lwazo ngokucacileyo zahlukile kwaye ngokubanzi azinakusetyenziselwa iinjongo ngokubanzi. Umzekelo, cinga nge-ZF6 kunye ne-ZF14.
2) I-voltage elinganisiweyo: ibhekisa kwixabiso elilinganisiweyo elinokuthwala i-circuit breaker phantsi kwe-frequency elinganisiweyo (50Hz) kunye ne-frequency elinganisiweyo (25Hz).
3) Umlinganiselo wamandla: ubhekisa kumlinganiselo wamandla osebenzayo ophezulu onokumelana nawo i-circuit breaker phantsi kweemeko ezithile.
4. “Umthamo wokuqhawula” uthetha ukuba i-circuit breaker inokuqhawula ngokuthembekileyo i-AC 50Hz okanye i-DC 1000V okanye ngaphantsi phantsi kweemeko ezimiselweyo, kwaye ixesha lokuqhawula aliyi kudlula i-5ms.
5) Iimpawu zokusebenza
Umgaqo wokukhetha
1, Yahlulwe yaba:
(1) Ii-circuit breakers zesigaba esinye zibhekisa kwezo zisetyenziselwa ukukhusela ii-circuit, ii-motor kunye nezinye izixhobo zombane. I-circuit breaker ineengenelo zokusebenza okungasoloko kusebenza kunye nokulula, kodwa kufuneka inqumle umbane ngexesha xa umgca kunye ne-motor zigcwele kakhulu okanye zifutshane ukuze kuthintelwe ingozi ukuba yande. Ke ngoko, i-circuit breaker kufuneka ihlangabezane neemfuno zokunqumle umbane ngexesha elimiselweyo, kunye nexesha elifutshane lokuphumla, ukukhetha okuhle njalo njalo.
(2) Igama elithi “isiphuli sesekethe esiphantsi se-AC esinezigaba ezintathu” libhekisa kwisiphuli sesekethe esisetyenziswa kwiisekethe zokukhusela nokulawula iimoto, esinomsebenzi ofanayo nesiphuli sesekethe esinezigaba esinye, kodwa songeze iswitshi yokuqhawula umbane kwisakhiwo sangaphakathi sesixhobo sombane ukuze sihlangabezane neemfuno zokukhusela iimoto kunye neesekethe zokulawula kwiisekethe ze-AC. Ukongeza, ikwanayo ne-overload relay, i-undervoltage relay kunye ne-zero sequence current relay.
Ixesha leposi: Februwari-17-2023