UKUQHATHANISWA KOKUSEBENZA KWESISEBENZI SOKUHLANGANISA SE-SF6 NE-CIRCUIT BREAKER

Ukuqhathaniswa Kokusebenza Kwesisetshenziswa Esihlanganisiwe se-SF6 kanye ne-Circuit Breaker

Ukusebenza kwe-transformer engenamthwalo kuyaphula

Iningi lezakhiwo zomthwalo weyunithi eyinhloko yendandatho ohlelweni lokusabalalisa amandla ukuhlukaniswa nokuvalwa kwe-transformer yokusabalalisa. Umthamo ojwayelekile ungama-315-1250 kVA, kanti ugesi ongenamthwalo we-transformer yokusabalalisa cishe u-2% wamandla alinganiselwe. Uma kuphulwa i-transformer engenamthwalo, uma i-circuit breaker inekhono eliqinile lokucisha i-arc, futhi indlela yokucisha i-arc iwuhlobo lwamandla angaphandle, kuzokwenzeka into yokunqamuka kwamanje kokucisha i-arc ngaphambi kuka-zero, okuzoholela ekunqamukeni kwe-cut-off. Uma kusetshenziswa i-circuit breaker, ngenxa yamandla ayo okucisha i-arc, yenzelwe ukuphula ugesi omkhulu we-short-circuit. Uma kuphulwa ugesi omncane we-transformer engenamthwalo, kungenzeka ukuthi kuqedwe ugesi we-arc, okuzoholela ekunqamukeni kwe-cut-off. Kulokhu, akufiseleki ukusebenzisa ama-circuit breaker anamakhono aqinile okucisha i-arc. Futhi iswishi yomthwalo ye-SF6, ngenxa yezici zikagesi zegesi ye-SF6, lapho i-arc ipholisiwe kugesi ye-SF6, isaqhuba ugesi kuze kube yilapho izinga lokushisa liphansi impela, futhi i-current cutoff ngaphambi kwe-current zero crosses incane, ngaleyo ndlela igwema i-overvoltage ephezulu. Ngakho-ke, ukusebenza kokusebenzisa iswishi yomthwalo ye-SF6 ukuphula i-transformer engenamthwalo kungcono kunokwe-SF6 circuit breaker, kanti i-SF6 circuit breaker ingcono kune-vacuum circuit breaker.

Vikela ukusebenza kwama-transformer okusabalalisa

Ukuze kuvikelwe ama-transformer okusabalalisa, ukusetshenziswa kwe-SF6 load switch + inhlanganisela ye-fuse kusebenza kakhulu kune-circuit breakers, futhi ngezinye izikhathi lokhu kwamuva akukwazi ngisho nokudlala indima yokuvikela ephumelelayo. Ukuhlolwa kwe-short-circuit kufakazela ukuthi lapho i-transformer ecwiliswe ku-oyela i-short-circuit, ukuze kuvinjelwe ithangi likawoyela ukuthi lingaqhumi, iphutha kumele lisuswe zingakapheli ama-millisecond angu-20. Ukunciphisa inani lamanje le-short-circuit kungavikela ngempumelelo i-transformer. Isikhathi sokuphuka esigcwele se-circuit breaker siqukethe izingxenye ezintathu, isikhathi sesenzo sokuvikela ukudluliselwa + isikhathi sesenzo esingokwemvelo se-circuit breaker + isikhathi sokugoba, ngokuvamile esidinga imijikelezo emithathu (ama-millisecond angu-60), ngakho-ke ayikwazi ukuvikela ngempumelelo i-transformer. Ngisho nama-transformer ohlobo olomile angcono kunokusebenzisa ama-circuit breakers ngenxa yesenzo sokuvikela esisheshayo sama-fuse.

Ukusebenza kokuxhumanisa ukuvikelwa kokudluliselwa

Ukuvikelwa kwe-circuit breaker ekugcineni kwekhanda lenethiwekhi yokusatshalaliswa kwe-ring network (i-10kV feed-out circuit breaker yesiteshi esincane) ngokuvamile kubekwe ukuthi kube yimizuzwana engu-0 yokuphumula okusheshayo, imizuzwana engu-0.5 yokudlula kogesi, kanye nemizuzwana engu-0.5 yokulandelana okungu-zero. Uma i-circuit breaker isetshenziswa kuyunithi eyinhloko ye-ring, noma ngabe isethwe kumasekhondi angu-0.5, kunzima ukuqinisekisa ukuthi i-first-end circuit breaker ayisebenzi kuqala ngenxa yokusabalala kwesikhathi sesenzo esingokwemvelo se-circuit breaker. I-fuse ekhawulela ugesi ayithintwa ukwehla kwamandla kagesi okubangelwa yi-short circuit, futhi ingasusa iphutha ngesikhathi esifushane kakhulu ngaphandle kokubangela ukuqhuma kwe-leapfrog.