Indlela yokubala yangoku ye-circuit breaker

Okokuqala ubale amandla ewonke P azo zonke izixhobo zombane, ekubaleni inani langoku lilonke A inani I=P/U,ukuvuza switchkufuneka ibe mkhulu kunomjelo opheleleyo, kufuneka kubekho Umda othile, okanye kufakelo lwezinye izixhobo zombane aziyi kukwazi ukumelana.Ukuvuza okushiyekileyo kwikhaya langoku 30MA inako.Ukuvuza kokutshintshangokuqhelekileyo ayingomsebenzi wokukhusela umthwalo, ukuba ufuna ukukhusela umgca kwisaphuli sesekethe esincinci, isaphuli sesekethe esincinci asikwazi ukukhetha esikhulu kakhulu.Ngokubanzi, uhlobo C lusetyenziswa.

Abaphuli beesekethe ezincincisebenzisa indlela yokubala elula eneziphoso ezingekho nkulu kakhulu kwaye inokwamkelwa kubunjineli:

(1) kwibakala lombane we-10/0.4kV wei-breaker circuit encinci, inokuqwalasela icala lombane ophezulu womthamo wesiphaluka esifutshane alinasiphelo (icala le-10KV lomthamo wesiphaluka esifutshane ngokubanzi li-200 ~ 400MVA okanye nangaphezulu, ngoko ngokungenasiphelo ukuqwalasela, impazamo ingaphantsi kwe-10%).

(2) I-Gb50054-95 "IKhowudi ye-Low-voltage Distribution Design Code" i-2.1.2 izibonelelo: "Xa isixa somjelo olinganisiweyo wemoto edibeneyo kufuphi ne-short-circuit point idlula i-1% ye-short-circuit current, impembelelo yemoto ingxelo yangoku kufuneka zibandakanywe.Ukuba i-short-circuit current yi-30KA, thatha i-1% yayo, ekufuneka ibe yi-300A.Amandla ewonke emoto amalunga ne-150KW, kwaye xa iqaliswa kwangaxeshanye, ingxelo yangoku ibandakanyiweyo kufuneka ibe yi-6.5∑In.

(3) i-impedance voltage e-UK ye-mini-circuit breaker imele isiphaluka esifutshane secala (isekethe), xa icala lifikelela kumjelo walo olinganisiweyo, i-voltage yecala lokuqala lixabiso leengongoma ezilikhulu zombane wayo olinganisiweyo.Ke ngoko, xa i-voltage ephambili ingumbane olinganisiweyo, umsinga wesibini ngumbane olindelekileyo wesekethe emfutshane.

(4) Icala elincinane lesaphuli sesekethe esilinganiswe sangoku i-Ite=Ste/1.732U Ste ngumthamo wesaphuli sesekethe esingephi (KVA), i-Ue licala elincinane lombane elilinganiswe ngombane (akukho mthwalo wombane), Ue= 0.4kV xa 10 /0.4kV, ngoko ke, icala lesibini elilinganiswe ngoku langoku le-mini-circuit breaker kufuneka libalwe ngokulula njengomthamo we-mini-circuit breaker X1.44 ~ 1.50.

(5) Ngokwenkcazo ye-Uk kwi-(3), i-short-circuit current yecala elincedisayo (isigaba sesithathu-i-short-circuit) yinkcazo ye-I (3) ye-Uk, kunye ne-short-circuit current of the Icala elincedisayo (isigaba esithathu-isiphaluka esifutshane) ngu-I(3)=Ite/Uk, elixabiso elisebenzayo le-AC.

(6) Ngaphantsi okufanayoi-mini-circuit breakerumthamo, ukuba kukho isiphaluka esifutshane phakathi kwezigaba ezibini, ngoko I (2) = 1.732I (3) / 2 = 0.866I (3)

Ubalo olungentla luxabiso lwangoku lwesiphaluka esifutshane kwi-outlet ye-miniature circuit breaker, eyona ngozi yesiphaluka esibi kakhulu.Ukuba kukho umgama othile phakathi kwendawo yesiphaluka esifutshane kunye ne-mini-circuit breaker, qwalasela i-impedance yomgca.