Amakhulu ama-ampere angaphezu kwe-1000 amperes yohlu lomthwalo, indlela yokukhetha i-breaker circuit

Ama-circuit breakers abunjiwezilinganiselwe kusuka ku-10A kuya ku-1600A, futhiama-breaker circuit breaker (ACB)zilinganiselwe kusuka ku-630A kuya ku-6300A.Bona i-circuit breaker yecala elibunjiwe kanyei-air circuit breakerilinganiselwe indawo egqagqene yamanje, kwesinye isikhathi angazi ukuthi ungayikhetha kanjani.

Kunezimiso ezimbalwa lapha.

Isistimu yokusabalalisa eyinhloko ohlelweni lokusabalalisa, olunakho kokubili iluphu yokuphakelayo kanye neluphu yemoto.

Into yokuvikela yesiphakeli sesekethe yesiphakeli ikhebula.Ngesikhathi esifanayo, ukudlaI-circuit breakerkumele ibone ubudlelwano bokuxhumanisa ukuvikela nabangenayoI-circuit breakeryesistimu yokusabalalisa yesibili, ngakho-ke okuphakelayoI-circuit breakerkufanele ibe nesivikelo se-S sesekethe esifushane.

I-Thermomagnetici-case circuit breaker elibunjiweinezigaba ezimbili kuphela zokuvikela, okungukuthi, ukulibaziseka okude isikhathi eside kwepharamitha engu-L kanye nepharamitha yesifunda esifushane esisheshayo, ayilungele iluphu yekhebula lokuphakelayo ende, kanye nokusebenzisai-electron-formed case circuit breakerngezigaba ezintathu zokuvikela.

Kumasekhethi ezimoto, sebenzisa isinqamuli sesekethe kazibuthe esisodwa, okungukuthi, isivikelo sesekethe esifushane kuphela, asikho isinqamuli sesekethe sokuvikela ukulayishwa ngokweqile.Okubonakalayo, lokhu kubuye kuhluke kokujwayelekilei-plastic case circuit breaker.

Ukwengeza, uma kukhona i-transformer yokuhlukanisa ekuphumeni kokusatshalaliswa okuyisisekelo, ngoba i-transformer inrush current icishe ilingane ne-short-circuit current, isilinganiso samanje se-breaker circuit singakhethwa ngokuvumelana nezikhathi ezingu-1.6 zamanje ezilinganiselwe i-transformer lapho kubalwa.Uma i-isolation transformer inomthamo omkhulu,ama-air circuit breakerskungenzeka zisetshenziswe.

Isibonelo, i-250kVA 0.4kV kuya ku-0.4kV isolation transformer, i-impedance voltage ingu-6%, yamanje yayo elinganiselwe yile:

I-short-circuit current ithi:

Sihlukanisa i-short-circuit current ngo-10 ukuze sithole i-600A, ngakho-ke sisebenzisa i-circuit breaker enesilinganiso samanje esingu-630A njengokujwayelekile.

Nokho, sicabangela ubude besikhathi somthelela we-excitation inrush current, sifuna ukusebenzisa ipharamitha yokubambezeleka kwesekethe engu-S ukuze ibambezeleke, bese kuthi i-630A elibunjiwe i-circuit breaker ayilungile, ukusebenzisa i-800A ye-circuit breaker, i-frame circuit breaker iDemo eside.

Ngaphezu kwalokho, uma ucabangela ikhebula langaphandle, kuyadingeka ukuhlola ukuzinza okushisayo kwekhebula, okuzokwandisa inani lamanje elilinganiselwe le-breaker circuit.

Okubonakalayo, kufanele sicabangele ukuthi hlobo luni lwe-circuit breaker okufanele siyikhethe.