Circuit breaker tam sim no xam txoj kev

Ua ntej xam tag nrho lub zog P ntawm tag nrho cov khoom siv hluav taws xob, hauv kev suav ntawm tag nrho tam sim no A tus lej I = P / U,leakage hloovyuav tsum muaj ntau tshaj qhov tam sim no tag nrho, yuav tsum muaj A tej npoo, los yog nyob rau hauv installation ntawm lwm yam khoom siv hluav taws xob yuav tsis muaj peev xwm tiv taus.Residual to tam sim no tsev neeg 30MA tuaj yeem.Hloov pauvyog feem ntau tsis overload tiv thaiv muaj nuj nqi, yog tias koj xav tiv thaiv kab rau me me Circuit Court breaker, me me Circuit Court breaker tsis tuaj yeem xaiv loj dhau.Feem ntau, hom C yog siv.

Miniature Circuit Court breakerssiv txoj kev suav yooj yim uas muaj qee qhov yuam kev uas tsis loj heev thiab tuaj yeem lees txais hauv engineering:

(1) rau 10/0.4kV voltage qib ntawmme me Circuit Court breaker, tuaj yeem txiav txim siab qhov hluav taws xob siab ntawm qhov luv luv Circuit Court muaj peev xwm tsis kawg (10KV sab ntawm lub peev xwm luv luv yog feem ntau 200 ~ 400MVA lossis ntau dua, yog li raws li kev txiav txim siab tsis kawg, qhov yuam kev tsawg dua 10%).

(2) Gb50054-95 "Low-voltage power Distribution Design Code" 2.1.2 cov kev cai: "Thaum cov lej ntawm cov ntsuas tam sim no ntawm lub cev muaj zog txuas ze ntawm qhov luv luv luv tshaj 1% ntawm qhov luv luv tam sim no, lub zog ntawm lub cev muaj zog tawm tswv yim tam sim no yuav tsum suav nrog.Yog tias qhov luv luv tam sim no yog 30KA, noj 1% ntawm nws, uas yuav tsum yog 300A.Tag nrho lub zog ntawm lub cev muaj zog yog li 150KW, thiab thaum nws pib tib lub sijhawm, cov lus tawm tswv yim tam sim no suav nrog yuav tsum yog 6.5∑In.

(3) lub impedance voltage UK ntawm lub mini-circuit breaker sawv cev rau sab luv luv Circuit Court (circuit), thaum sab mus txog nws rated tam sim no, tus thawj sab voltage yog lub puas point tus nqi ntawm nws rated voltage.Yog li, thaum thawj qhov hluav taws xob yog qhov ntsuas hluav taws xob, qhov thib ob tam sim no yog nws qhov kev xav tau luv luv tam sim no.

(4) Me me sab ntawm lub Circuit Court breaker ntsuas tam sim no Ite = Ste / 1.732U Ste yog lub peev xwm ntawm cov hluav taws xob me me (KVA), Ue yog qhov me me sab ntsuas hluav taws xob (tsis muaj hluav taws xob), Ue = 0.4kV thaum 10 / 0.4kV, yog li ntawd, qhov thib ob sab ntsuas tam sim no ntawm mini-circuit breaker yuav tsum tau xam yooj yim raws li lub peev xwm ntawm mini-circuit breaker X1.44 ~ 1.50.

(5) Raws li lub ntsiab lus ntawm Uk hauv (3), luv luv tam sim no ntawm lub koom haum sab (peb-theem luv-circuit) yog lub ntsiab lus ntawm I(3) rau Uk, thiab luv luv tam sim no ntawm lub auxiliary sab (peb-theem luv-circuit) yog I(3) = Ite/Uk, uas yog tus nqi zoo ntawm AC.

(6) Raws li qhov qubmini-circuit breakermuaj peev xwm, yog tias muaj luv luv ntawm ob theem, ces kuv (2) = 1.732I (3) / 2 = 0.866I (3)

Cov kev suav sau saum toj no yog tus nqi tam sim no ntawm luv luv Circuit Court ntawm qhov hluav taws xob ntawm qhov hluav taws xob me me Circuit Court breaker, uas yog qhov teeb meem loj tshaj plaws luv luv Circuit Court.Yog hais tias muaj ib qho kev ncua deb ntawm qhov luv luv Circuit Court thiab lub mini-circuit breaker, xav txog cov kab impedance.