Indlela yokubala ye-circuit breaker yamanje

Okokuqala bala isamba samandla P azo zonke izinto zikagesi, ekubalweni kwesamba senani lamanje A inombolo I=P/U,ukuvuza switchkufanele ibe nkulu kunomthamo ophelele, kufanele kube ne-margin ethile, noma ekufakweni kwezinye izinto zikagesi ngeke zikwazi ukumelana.Ukuvuza okuyinsalela yamanje yasendlini 30MA can.Ukushintsha kokuvuzangokuvamile akuwona umsebenzi wokuvikela ukulayisha ngokweqile, uma ufuna ukuvikela umugqa ku-breaker encane, i-breaker circuit encane ayikwazi ukukhetha enkulu kakhulu.Ngokuvamile, kusetshenziswa uhlobo C.

Ama-circuit breaker amancanesebenzisa indlela yokubala elula enamaphutha angemkhulu kakhulu futhi angamukelwa kubunjiniyela:

(1) ngebanga lika-10/0.4kV kagesi wei-breaker circuit encane, ingacabangela uhlangothi lwe-voltage ephezulu yomthamo wesifunda esifushane alipheli (uhlangothi lwe-10KV lomthamo wesifunda esifushane ngokuvamile luyi-200 ~ 400MVA noma ngisho nangaphezulu, ngakho ngokusho okungapheli okufanele kucatshangelwe, iphutha lingaphansi kuka-10%).

(2) Gb50054-95 “Ikhodi Yokuklama Yokusabalalisa Amandla Aphansi Amandla Aphansi” 2.1.2 izinhlinzeko: “Lapho isamba semali elinganiselwe yenjini exhunywe eduze kwendawo yesiyingi esifushane idlula u-1% wamanje wesekethe emfishane, umthelela ye-motor impendulo yamanje kufanele ifakwe.Uma i-short-circuit current ingu-30KA, thatha u-1% wayo, okumele ube ngu-300A.Amandla esewonke enjini angaba ngu-150KW, futhi uma iqaliswa ngesikhathi esifanayo, impendulo yamanje efakiwe kufanele ibe ngu-6.5∑In.

(3) i-impedance voltage UK ye-mini-circuit breaker imelela isifunda esifushane esiseceleni (umjikelezo), lapho uhlangothi lufinyelela umkhawulo walo wamanje, i-voltage yaseceleni yasekuqaleni iyinani lamaphuzu ayikhulu we-voltage yayo elinganiselwe.Ngakho-ke, lapho i-voltage eyinhloko iyi-voltage elinganisiwe, i-current yesibili ingumsinga wayo olindelekile wesiyingi esifushane.

(4) Uhlangothi oluncane lwe-circuit breaker lulinganiswe njengamanje i-Ite=Ste/1.732U Ste umthamo wesiphakeli sesekethe esincane (KVA), i-Ue iwumthamo omncane olinganiselwe ohlangothini (i-voltage engalayishiwe), Ue= 0.4kV uma ingu-10 /0.4kV, ngakho-ke, uhlangothi lwesibili olukalwe okwamanje lwebreaker-circuit mini kufanele lubalwe kalula njengomthamo webreaker mini-circuit X1.44 ~ 1.50.

(5) Ngokwencazelo ye-Uk ku-(3), umthamo wesekethe omfishane wohlangothi olusizayo (isigaba esifushane sesigaba sesithathu) incazelo ye-I(3) ye-Uk, kanye nomsinga wesekethe omfushane uhlangothi olusizayo (isigaba esifushane sezigaba ezintathu) ngu-I(3)=Ite/Uk, okuyivelu esebenzayo ye-AC.

(6) Ngaphansi okufanayoi-mini-circuit breakerumthamo, uma kukhona isifunda esifushane phakathi kwezigaba ezimbili, khona-ke I(2)=1.732I(3)/2=0.866I(3)

Isibalo esingenhla yinani lamanje lesekhethi emfushane lapho kuphuma khona isihlukanisi sesekethe esincane, okuyingozi embi kakhulu yesekethe emfushane.Uma kukhona ibanga elithile phakathi kwephuzu lesifunda esifushane kanye ne-mini-circuit breaker, cabanga nge-impedance yomugqa.