Ingxoxo malunga nomthamo wokuqhekeka kombane we-short-circuit we-low-voltage circuit breakers ze-distribution transformers

Ekubeni idatha yomthamo wenkqubo yesekethe emfutshane kunye ne-impedance yesekethe emfutshane kufuneka inikwe lisebe lokubonelela ngombane, uyilo lombane lweeprojekthi ezininzi zokwakha alwenzi ubalo oluchanekileyo lwamandla esekethe emfutshane okwangoku.

Indlela echanekileyo: Bala i-short-circuit current yecala le-low-voltage kwii-transformers zamandla ahlukeneyo kwiprojekthi nganye, kuquka ubuncinane ixabiso eliphezulu le-short-circuit current: i p

I-RMS yangoku ye-Steady State Short-Circuit Current: I k

Xa ukhetha i-circuit breaker, ubuncinane amandla okuqhekeza i-short-circuit aqikelelweyo e-circuit breaker kufuneka aqinisekiswe: 1 i-cu

Akukho ngaphantsi kwe: I k

Kwiprojekthi nganye, kufuneka kukhethwe intambo enendawo encinci enqamlezileyo kunye nendlela emfutshane ukuze kuqinisekiswe uzinzo lobushushu bamandla ombane olufutshane, kwaye kufuneka kukhethwe isiphelo somthwalo esinendlela ende yokusasazwa ukuze kuhlalutywe ukuhla kwevolthi. Ukuba indawo enqamlezileyo yentambo ayihlangabezani neemfuno, kufuneka kulungiswe indawo enqamlezileyo yentambo.

Phantsi kwemeko yokuba umthamo wenkqubo awunamda, iiparameter zangoku zesekethe kwindawo yokuphuma kwicala le-low-voltage ye-transformer ehambelana nomthamo owahlukileyo kunye neeparameter ze-impedance voltage ze-short-circuit kufuneka zibe nkulu kunomthamo we-short-circuit weprojekthi yokwenyani apho umthamo we-short-circuit wenkqubo ungenamda. Ingasetyenziselwa ukujonga usasazo lwe-low-voltage. Umthamo wokuqhekeka kwe-electrical circuit breaker.

Umzekelo omnye, unokubonwa kwitheyibhile yokukhetha i-short-circuit current yeentambo ze-XLPE ze-copper core eziphantsi kwe-voltage, apho kwii-transformers ze-1000kVA nangaphantsi, indawo enqamlezileyo yentambo yokusasaza kwibhasi ye-voltage ephantsi ayifanele ibe ngaphantsi kwe-10mm2; kwii-transformers ezingaphezulu kwe-1000kVA, indawo enqamlezileyo yentambo yokusasaza ayifanele ibe ngaphantsi kwe-16mm2.

Kwiiprojekthi ezinkulu okanye ezibalulekileyo zokwakha zikawonke-wonke, ukubalwa komsinga wesekethe emfutshane kuyacetyiswa xa umsinga wesekethe emfutshane unempembelelo enkulu ekukhetheni izixhobo.