Amakhulu ama-ampere ukuya kwi-1000 amperes yoluhlu lomthwalo, indlela yokukhetha i-breaker circuit

I-molded case circuit breakerszilinganiswe ukusuka ku-10A ukuya ku-1600A, kwayeizaphuli zesakhelo sesekethe (ACB)zilinganiswe ukusuka kwi-630A ukuya kwi-6300A.Jonga i-molded case circuit breaker kunyei-air circuit breakerireyithiwe indawo yangoku edityanisiweyo, ngamanye amaxesha andazi ukuba makakhethe njani.

Kukho imigaqo embalwa apha.

Inkqubo yokuhambisa ephambili kwinkqubo yokuhambisa, ene-loop yokutya kunye ne-motor loop.

Into yokukhusela ye-breaker circuit feed yintambo.Ngexesha elifanayo, ukutyaumephuli wojikelezokufuneka aqonde unxibelelwano lokhuseleko kunye neyona nto ingenayoumephuli wojikelezoyenkqubo yonikezelo yesibini, ngoko feedumephuli wojikelezokufuneka ube nokhuseleko lwesekethe olufutshane S.

Thermomagneticityala elibunjiweyo umaphuli weseketheinamacandelo amabini kuphela okhuseleko, oko kukuthi, ukulibaziseka kwexesha elide L iparamitha kunye nesekethe emfutshane ngoko nangoko I parameter, ayifanelekanga iluphu yentambo yomxhesho omde, kunye nokusebenzisaI-electronic molded case circuit breakerngamacandelo amathathu okhuseleko.

Kwiisekethe zeemoto, sebenzisa i-breaker magnetic circuit breaker, oko kukuthi, kuphela ukhuseleko lwesiphaluka esifutshane, akukho sithintelo sokukhusela isiphaluka.Okubonakalayo, oku kwahlukile kwisiqheloiplastiki ityala lesekethe umaphuli.

Ukongeza, ukuba kukho i-transformer yodwa kwindawo yokuphuma yokusabalalisa okuphambili, ngenxa yokuba i-transformer inrush yangoku iphantse ilingane ne-short-circuit current, i-current rated current ye-breaker circuit inokukhethwa ngokwe-1.6 yamaxesha angoku. i-transformer xa ubala.Ukuba i-transformer yodwa inomthamo omkhulu,abaphuli beesekethe zomoyakunokwenzeka ukuba zisetyenziswe.

Umzekelo, 250kVA 0.4kV ukuya 0.4kV isolation transformer, impedance voltage yi 6%, umlinganiselo wayo ngoku:

Umsinga omfutshane ngu:

Sahlula i-short-circuit current nge-10 ukufumana i-600A, ngoko sisebenzisa i-breaker circuit kunye ne-630A yangoku njengesiqhelo.

Nangona kunjalo, siqwalasela ubude bexesha lempembelelo ye-excitation inrush yangoku, sifuna ukusebenzisa ukulibaziseka kwesekethe emfutshane ye-S parameter ukulibazisa, emva koko i-630A i-molded case ye-breaker circuit ayilungile, ukusebenzisa i-800A isakhelo sesiphaluka se-breaker, isakhelo se-breaker circuit breaker i-short circuit breaker. ixesha elide.

Ukongezelela, xa uqwalasela ikhebula langaphandle, kuyimfuneko ukujonga ukuzinza kwe-thermal yentambo, eya kwandisa ixabiso langoku elilinganisiweyo le-breaker circuit.

Okubonakalayo, kufuneka siqwalasele ukuba luhlobo luni lwe-circuit breaker ukukhetha.