KUYEREKEZA NTCHITO YA CHIPANGIZO CHOPHATIKIZA CHA SF6 NDI CHIGAWO CHA DERA

Kuyerekeza Magwiridwe Antchito a SF6 Combination Appliance ndi Circuit Breaker

Kuswa magwiridwe antchito a transformer yopanda katundu

Zinthu zambiri zomwe zimafunika pa gawo lalikulu la mphete mu dongosolo logawa mphamvu ndi kugawanika ndi kutsekedwa kwa chosinthira chogawa. Mphamvu yonse ndi 315-1250 kVA, ndipo mphamvu yamagetsi yopanda katundu ya chosinthira chogawa ndi pafupifupi 2% ya mphamvu yovotera. Pophwanya chosinthira chopanda katundu, ngati chosinthira chogawa chili ndi mphamvu yozimitsa yamphamvu ya arc, ndipo njira yozimitsa ya arc ndi yamtundu wa mphamvu zakunja, chodabwitsa cha kudulidwa kwa mphamvu yamagetsi yozimitsa ya arc isanafike zero chidzachitika, zomwe zimapangitsa kuti pakhale mphamvu yozimitsa ya cut-off. Ngati chosinthira chogawa chikugwiritsidwa ntchito, chifukwa cha mphamvu yake yozimitsa ya arc, chimapangidwa kuti chiswe mphamvu yayikulu yamagetsi yochepa. Pophwanya mphamvu yamagetsi yaying'ono ya chosinthira chopanda katundu, kuzimitsa kwamphamvu kwa arc kungachitike, zomwe zimapangitsa kuti pakhale mphamvu yozimitsa ya cut-off. Pachifukwa ichi, sikoyenera kugwiritsa ntchito zosinthira zogawa zomwe zili ndi mphamvu yamagetsi yozimitsa ya arc. Ndipo switch ya SF6 load, chifukwa cha mawonekedwe amagetsi a gasi wa SF6, arc ikazizira mu gasi wa SF6, imagwirabe ntchito magetsi mpaka kutentha kutakhala kotsika, ndipo kutha kwa magetsi amagetsi asanafike pa zero current kumakhala kochepa, motero kupewa kupitirira mphamvu kwamagetsi. Chifukwa chake, magwiridwe antchito a SF6 load switch kuswa transformer yopanda katundu ndi abwino kuposa a SF6 circuit breaker, ndipo SF6 circuit breaker ndi abwino kuposa vacuum circuit breaker.

Tetezani magwiridwe antchito a ma transformer ogawa

Pofuna kuteteza ma transformer ogawa, kugwiritsa ntchito SF6 load switch + fuse combination ndi kothandiza kwambiri kuposa ma circuit breaker, ndipo nthawi zina izi sizingathandize ngakhale kuteteza bwino. Mayeso a short-circuit amatsimikizira kuti transformer yomizidwa ndi mafuta ikafupikitsidwa, kuti thanki yamafuta isaphulike, cholakwikacho chiyenera kuchotsedwa mkati mwa ma millisecond 20. Kuchepetsa mtengo wa short-circuit current kungateteze bwino transformer. Nthawi yonse yosweka ya circuit breaker imakhala ndi magawo atatu, nthawi yoteteza relay + nthawi yogwira ntchito ya circuit breaker + nthawi yozungulira, yomwe nthawi zambiri imafuna ma cycle atatu (ma millisecond 60), kotero singathe kuteteza bwino transformer. Ngakhale ma transformer ouma ndi abwino kuposa kugwiritsa ntchito ma circuit breaker chifukwa cha chitetezo chachangu cha ma fuses.

Kugwirizana kwa chitetezo cha relay

Chitetezo cha chopachikira cha dera kumapeto kwa netiweki yogawa maukonde a mphete (chopachikira cha 10kV cha substation) nthawi zambiri chimakhala masekondi 0 kuti chipumule mwachangu, masekondi 0.5 kuti chipumule champhamvu kwambiri chikhale chokwera, ndi masekondi 0.5 kuti chipumule chikhale chotsika kwambiri. Ngati chopachikira cha dera chikugwiritsidwa ntchito mu gawo lalikulu la mphete, ngakhale chitakhala masekondi 0.5, zimakhala zovuta kuonetsetsa kuti chopachikira cha dera loyamba sichichitapo kanthu poyamba chifukwa cha kufalikira kwa nthawi yogwira ntchito ya chopachikira cha dera. Fuse yoletsa magetsi sikhudzidwa ndi kutsika kwa magetsi komwe kumachitika chifukwa cha short circuit, ndipo imatha kuchotsa cholakwikacho munthawi yochepa kwambiri popanda kuyambitsa leapfrog trip.