UTHELEKISO LWENKQUBO YESIXHOBO SOKUXUBANA SE-SF6 NE-SERCUIT BREAKER

Uthelekiso Lokusebenza Kwesixhobo Sokudibanisa se-SF6 kunye ne-Circuit Breaker

Ukwaphula ukusebenza kwe-transformer engenamthwalo

Uninzi lweempawu zomthwalo weyunithi ephambili yeringi kwinkqubo yokusasazwa kwamandla kukuqhekeka nokuvalwa kwe-transformer yokusasazwa. Umthamo oqhelekileyo yi-315-1250 kVA, kwaye umsinga ongenamthwalo we-transformer yokusasazwa umalunga ne-2% yomsinga olinganisiweyo. Xa kuphulwa i-transformer engenamthwalo, ukuba i-circuit breaker inamandla okucima i-arc, kwaye indlela yokucima i-arc luhlobo lwamandla angaphandle, kuya kwenzeka into yokunqunyulwa komsinga we-arc onyanzelisiweyo ngaphambi kokuba kubekho u-zero, okubangela ukunqunyulwa komsinga we-arc. Ukuba kusetyenziswa i-circuit breaker, ngenxa yamandla ayo okucima i-arc, yenzelwe ukuqhekeza umsinga omkhulu we-short-circuit. Xa kuphulwa umsinga omncinci we-transformer engenamthwalo, ukunqunyulwa komsinga we-arc kunokwenzeka, okubangela ukunqunyulwa komsinga we-arc. Kule nkalo, akunqweneleki ukusebenzisa ii-circuit breakers ezinezakhono zokucima umsinga ze-arc ezinamandla. Kwaye iswitshi yomthwalo ye-SF6, ngenxa yeempawu zombane zegesi ye-SF6, xa i-arc ipholisiwe kwigesi ye-SF6, isaqhuba umbane de ubushushu bube phantsi kakhulu, kwaye i-current cutoff ngaphambi kokuba i-current zero crosses incinci, ngaloo ndlela ithintela i-overvoltage ephezulu. Ke ngoko, ukusebenza kokusebenzisa iswitshi yomthwalo ye-SF6 ukuphula i-transformer engenamthwalo kungcono kunokwe-SF6 circuit breaker, kwaye i-SF6 circuit breaker ingcono kune-vacuum circuit breaker.

Khusela ukusebenza kwee-transformers zokusasaza

Ukukhusela ii-transformers zokusasaza, ukusetyenziswa kwe-SF6 load switch + i-fuse combination kusebenza ngakumbi kunee-circuit breakers, kwaye ngamanye amaxesha le yokugqibela ayinakudlala indima yokukhusela esebenzayo. Uvavanyo lwe-short-circuit lubonisa ukuba xa i-transformer efakwe kwi-oyile i-short-circuit, ukuze kuthintelwe ukuba itanki yeoyile ingaqhumi, impazamo kufuneka isuswe ngaphakathi kwee-millisecond ezingama-20. Ukunciphisa ixabiso langoku le-short-circuit kunokukhusela ngempumelelo i-transformer. Ixesha elipheleleyo lokuqhekeka kwe-circuit breaker linamacandelo amathathu, ixesha lesenzo sokukhusela i-relay + ixesha lesenzo eliyimvelaphi ye-circuit breaker + ixesha lokujika, elidla ngokufuna imijikelo emithathu (ii-millisecond ezingama-60), ngoko ke ayinakukhusela ngempumelelo i-transformer. Kwanee-transformers zohlobo olomileyo zingcono kunokusebenzisa ii-circuit breakers ngenxa yesenzo sokukhusela ngokukhawuleza kwee-fuses.

Ukusebenza kokulungelelanisa ukhuseleko lwereyi

Ukhuseleko lwe-circuit breaker kwisiphelo sentloko yenethiwekhi yokusasazwa kweringi (i-10kV feed-out circuit breaker yesitishi esingaphantsi) luqhele ukuba yi-0 imizuzwana yokuqhawula ngokukhawuleza, imizuzwana eyi-0.5 yokugqithisela umbane, kunye nemizuzwana eyi-0.5 yolandelelwano olungenanto. Ukuba i-circuit breaker isetyenziswa kwiyunithi ephambili yeringi, nokuba imiselwe kwimizuzwana eyi-0.5, kunzima ukuqinisekisa ukuba i-first-end circuit breaker ayisebenzi kuqala ngenxa yokusasazeka kwexesha lesenzo eliyindalo le-circuit breaker. I-current-limiting fuse ayichaphazeleki kukwehla kwe-voltage okubangelwa yi-short circuit, kwaye inokususa impazamo ngexesha elifutshane kakhulu ngaphandle kokubangela i-leapfrog trip.