UMSEBENZI WOKUTHELEKISWA KWESIXEKO SOKUHLANGANISWA KWE-SF6 KUNYE NE-CIRCUIT BREAKER

Uthelekiso lokuSebenza lweSF6 oluDityanisiweyo lweSibonelelo kunye neSaphuli seSekethe

Ukwaphula ukusebenza kwe-transformer engenamthwalo

Uninzi lweempawu zomthwalo weyunithi ephambili yeringi kwinkqubo yokuhambisa amandla kukuqhekeka kunye nokuvalwa kwe-transformer yokuhambisa. Umthamo jikelele ngu-315-1250 kVA, kwaye i-no-load current ye-transformer yokusabalalisa imalunga ne-2% ye-current rated current. Xa uqhekeza i-transformer engekho-load, ukuba i-breaker yesiphaluka inamandla okucima i-arc, kwaye indlela yokucima i-arc luhlobo lwamandla angaphandle, isiganeko sokunyanzeliswa kwe-arc yokucima i-current cut-off ngaphambi kokuba i-zero yenzeke, ibangele ukunqunyulwa kwe-overvoltage. Ukuba i-breaker circuit isetyenzisiweyo, ngenxa yekhono layo lokucima i-arc, yenzelwe ukuphula i-current short-circuit current. Xa uphula i-current encinci ye-transformer engenamthwalo, ukucinywa kwe-arc okunyanzeliswayo kunokwenzeka ukuba kwenzeke, okubangelwa ukuchithwa kwe-cut-off overvoltage. Kule nkalo, akunqweneleki ukusebenzisa ii-circuit breakers ezinamandla okucima i-arc. Kunye SF6 umthwalo switch, ngenxa iimpawu zombane SF6 irhasi, xa i-arc ipholile kwigesi SF6, isaqhuba umbane de iqondo lobushushu liphantsi kakhulu, kwaye i-cutoff yangoku phambi kokuba iminqamlezo ye-zero yangoku incinci, ngaloo ndlela iphephe ukugqithisa okukhulu. Ngoko ke, ukusebenza kokusetyenziswa komthwalo we-SF6 ukuphula i-transformer engekho-mthwalo ingcono kune-SF6 i-circuit breaker, kunye ne-SF6 i-circuit breaker ingcono kune-vacuum circuit breaker.

Khusela ukusebenza kwee-transformers zokuhambisa

Ukukhusela i-transformers yokusabalalisa, ukusetyenziswa kwe-SF6 yokutshintshwa komthwalo + ukudibanisa i-fuse kusebenza ngakumbi kuneziphambano zesiphaluka, kwaye ngamanye amaxesha le yokugqibela ayinakudlala indima yokukhusela. Uvavanyo olufutshane lwesiphaluka lubonisa ukuba xa i-oyile-i-immersed transformer is short-circuited, ukwenzela ukukhusela itanki yeoli ekuqhumeni, iphoso kufuneka isuswe ngaphakathi kwe-20 millisecond. Ukukhawulela ixabiso langoku lesekhethi emfutshane kunokukhusela ngokufanelekileyo i-transformer. Ixesha elipheleleyo lekhefu le-breaker circuit linamacandelo amathathu, ixesha lokukhuselwa kwe-relay + ixesha lesenzo se-inherent ye-circuit breaker + ixesha le-arcing, elifuna ngokubanzi imijikelezo emithathu (i-60 millisecond), ngoko ayikwazi ukukhusela ngokufanelekileyo i-transformer. Nokuba ii-transformers zohlobo olomileyo zingcono kunokusebenzisa ii-breakers zesekethe ngenxa yesenzo sokukhusela ngokukhawuleza se-fuses.

Ukusebenza kokulungelelaniswa kokukhuselwa kwe-Relay

Ukukhuselwa kwe-circuit breaker ekupheleni kwentloko ye-ring network distribution network (i-10kV feed-out circuit breaker of the substation) ngokuqhelekileyo imiselwe ukuba ibe yi-0 imizuzwana yokuphumla ngokukhawuleza, i-0.5 imizuzwana ye-overcurrent, kunye ne-0.5 imizuzwana yokulandelelana kwe-zero. Ukuba i-breaker circuit isetyenziswe kwiyunithi engundoqo ye-ring, nokuba ibekwe kwi-0.5 imizuzwana, kunzima ukuqinisekisa ukuba i-circuit breaker ye-first-end ayenzi kuqala ngenxa yokusabalalisa kwexesha lesenzo se-inherent ye-breaker circuit. I-fuse yokunciphisa yangoku ayichatshazelwa kukuhla kwe-voltage okubangelwa yi-short circuit, kwaye inokususa iphoso ngexesha elifutshane kakhulu ngaphandle kokubangela uhambo lwe-leapfrog.