KUENZANISA KWEMASHANDIRO EMUDZIYO WESF6 COMBINATION APPLIANCE NE CIRCUIT BREAKER

Kuenzanisa Kushanda kweSF6 Combination Appliance neCircuit Breaker

Kuputsa mashandiro etransformer isina mutoro

Zvizhinji zvezvimiro zvemutoro we ring main unit mu power distribution system ndeyekupatsanura nekuvhara kwe distribution transformer. Kugona kwayo kwese i315-1250 kVA, uye current ye distribution transformer isingabhadhare inenge 2% ye rated current. Kana transformer isingabhadhare, kana circuit breaker iine arc extinguished arc extinguished, uye arc extinguished method iri external energy type, chiitiko chekumanikidzwa arc extinguishing current cut-off isati yasvika zero chichaitika, zvichikonzera cut-off overvoltage. Kana circuit breaker ikashandiswa, nekuda kwekugona kwayo arc extinguishing, yakagadzirirwa kupwanya short-circuit current hombe. Kana kupwanya current diki ye transformer isingabhadhare, kumanikidzwa arc extinguished kunogona kuitika, zvichikonzera cut-off overvoltage. Panyaya iyi, hazvidiwi kushandisa circuit breakers dzine arc extinguished arc extinguished. Uye SF6 load switch, nekuda kwehunhu hwemagetsi hwegasi reSF6, kana arc yatonhodzwa mugasi reSF6, inoramba ichifambisa magetsi kusvika tembiricha yaderera, uye current cutoff isati yasvika zero current crosses idiki, nokudaro kudzivirira overvoltage yakakwira. Saka, mashandiro ekushandisa SF6 load switch kupwanya no-load transformer ari nani pane eSF6 circuit breaker, uye SF6 circuit breaker iri nani pane vacuum circuit breaker.

Chengetedza mashandiro e transformers dzinogovera

Kuti pave nekuchengetedzwa kwematransformer anogovera, kushandiswa kweSF6 load switch + fuse combination kunoshanda kupfuura macircuit breaker, uye dzimwe nguva ma transformer aya haakwanise kuita basa rekudzivirira. Kuyedzwa kwe short-circuit kunoratidza kuti kana transformer inonyudzwa muoiri ikapfupikiswa, kuitira kudzivirira tangi remafuta kuti risaputika, dambudziko rinofanira kubviswa mukati memamirisendi makumi maviri. Kuderedza kukosha kwe short-circuit current kunogona kudzivirira transformer zvinobudirira. Nguva yekupwanyika kwe circuit breaker ine zvikamu zvitatu, nguva yekudzivirira relay + nguva yekushanda ye circuit breaker + nguva yekumhanya, iyo inowanzoda ma cycle matatu (60 milliseconds), saka haigone kudzivirira transformer zvinobudirira. Kunyangwe ma transformer akaoma ari nani pane kushandisa ma circuit breaker nekuda kwekudzivirira nekukurumidza kwema fuses.

Kurongeka kwekushanda kwekudzivirira relay

Kudzivirirwa kwecircuit breaker kumusoro kwe ring network distribution network (10kV feed-out circuit breaker ye substation) kunowanzo gadzirirwa kuva 0 seconds kuti quick break ishande, 0.5 seconds kuti overcurrent ishande, uye 0.5 seconds kuti zero sequence isashande. Kana circuit breaker ikashandiswa mu ring main unit, kunyangwe kana yakaiswa pa 0.5 seconds, zvakaoma kuona kuti first-end circuit breaker haishande pakutanga nekuda kwekupararira kwenguva ye action ye circuit breaker. Current-limiting fuse haikanganisike nekudonha kwevoltage kunokonzerwa ne short circuit, uye inogona kubvisa zvikanganiso munguva pfupi pasina kukonzera leapfrog trip.