umbono weSekethe Breakers
I-Circuit Breaker sisixhobo esiphambili kwinkqubo yamandla esetyenziselwa ukukhusela nokulawula iisekethe. Iyakwazi ukuvala, ukuthwala kunye nokuphula okwangoku phantsi kweemeko eziqhelekileyo okanye iimpazamo. Imisebenzi yayo ephambili ibandakanya ukukhuselwa kokugqithiswa, ukukhuselwa kwe-short-circuit, ukukhuselwa kwe-undervoltage, njl njl. Ilingana nendibaniselwano ye-fuses kunye ne-over / under-voltage relays thermal, kodwa inokuthembeka okuphezulu kunye nokusebenziseka kwakhona.

Iimpawu eziphambili zeeparamitha
Umbane olinganisiweyo (Ue) : Owona mbane uphezulu apho i-breaker circuit isebenza ngokuqhelekileyo, njenge-220V, 380V, njl.

Ilinganiswe ngoku (In) : Ixabiso eliphezulu langoku elinokuthi liqhutywe ngokukhuselekileyo kwixesha elide, elimele libe likhulu kunokusebenza kwangoku kwesekethe nge-35%.

Umthamo wokuqhawula (Icu / Ics) : Ukuphela kwe-short-circuit breaking capacity (Icu) ibhekisela ekukwazini ukuphula ubuninzi be-short-circuit current ngexesha elinye. I-Operating breaking capacity (Ics) ibhekisa kumda wangoku osenokusetyenziswa emva kokwaphuka. Ngokubanzi, ii-breaker circuit breakers zifuna i-Ics≥50%Icu, kunye ne-molded case circuit breakers zifuna i-Ics≥25% ICU.

Ixesha elifutshane lokumelana nombane (Icw) : Ikhono le-breaker circuit ukumelana nombane we-short-circuit current ngaphakathi kwexesha elithile ngaphandle komonakalo.

Ii. Ulwahlulo lwabaphuli beeSekethe
1. Ngomgangatho wombane
I-High-voltage circuit breakers: Isetyenziswa kwiisistim ze-3kV nangaphezulu. Imidiya eqhelekileyo yokucima i-arc ibandakanya i-sulfur hexafluoride (SF6), i-vacuum, ioli, njl.

I-low-voltage circuit breakers ihlelwa kwiindidi ezintathu: uhlobo lwesakhelo (ACB), uhlobo lwecala elibunjiweyo (MCCB), kunye nohlobo oluncinci (MCB). 57.

2. Ngokwesakhiwo kunye nokusetyenziswa
Isakhelo sohlobo lwesakhelo sesekethe (ACB
Ilinganiswe ngoku: i-200A ukuya kwi-6300A, ixhotyiswe ngokukhuselwa kwamanqanaba amane (ukulibaziseka kwexesha elide, ukulibaziseka okufutshane, ngokukhawuleza, kunye nesiphambeko somhlaba), isetyenziselwa ukukhuselwa kokutshintsha okuphambili kwiinkqubo zokusabalalisa okanye izixhobo ezinkulu.

I-molded case circuit breaker (MCCB
Isakhiwo esibambeneyo, esilinganiswe ngoku kwi-10A ukuya kwi-1600A, ilungele ukukhuselwa kwesiphaluka sesebe. I-MCCB ye-elektroniki ixhasa ukhuseleko olukhethiweyo, kwaye ezinye iimodeli zinomsebenzi we-interlock wengingqi 57.

Iqhekeza leSekethe eliNcinci (MCB
Isetyenziswe kwiisekethe ze-terminal ezingaphantsi kwe-125A (ezifana nezindlu kunye nezorhwebo), ezifumaneka kwi-1P ukuya kwi-4P yenkcazo, kwaye ixhasa ukugqithiswa, isiphaluka esifutshane kunye nokukhuselwa kokuvuza.

3. Cinezela iteknoloji yokucima i-arc
I-vacuum circuit breaker: Ukucima i-arc ngokukhawuleza, ubomi benkonzo ende, ilungele iimeko zokusebenza rhoqo 4.

I-SF6 i-circuit breaker: Ine-insulation egqwesileyo kunye nokusebenza kokucima i-arc kwaye isetyenziswa kakhulu kwiinkqubo eziphezulu ze-voltage. Ukucoceka kwegesi kufuneka kuhlolwe rhoqo.

Iii. Imigaqo yokuKhetha i-Circuit Breaker
Tshatisa iiparamitha zesekethe
I-voltage elinganisiweyo ≥ i-voltage ye-line, i-related current ≥ ubuninzi bomthwalo wangoku, umthamo wokuqhawula ≥ olindelekileyo i-short-circuit current 57.

Ukulungelelanisa uhlobo lomthwalo
Ukukhuselwa kwemoto kufuneka kuthathelwe ingqalelo ukuqala kwangoku (ixabiso lokumisela uhambo olukhawulezayo liyi-1.35 ukuya kuma-1.7 amaxesha okuqala ngoku). Isekethe yokukhanyisa ithatha amaxesha amathandathu umthwalo wangoku we-78.

Ulungelelwaniso olukhethiweyo
Abaqhankqalazi beesekethe eziphezulu kunye nezantsi kufuneka bahlangabezane nokuhluka kwexesha (njengokuhlukana kwesenzo sokulibaziseka okufutshane ≥0.1s) kunye nokwahlukana kwangoku (isenzo sangoku sezinga eliphezulu ≥ amaxesha angama-1.2 kwinqanaba eliphantsi) ukuphepha ukuhamba kwinqanaba eliphezulu.

Ukuziqhelanisa nokusingqongileyo
Kwiindawo eziphakamileyo eziphakamileyo, ezinomswakama okanye ezinobushushu obuphezulu, iimodeli ezikhethekileyo kufuneka zikhethwe kwaye zihlengahlengiswe ngoku (ukunciphisa umthamo kuyadingeka xa izinga lokushisa lidlula i-40 ℃). 13.

Iv. Uvavanyo kunye noLondolozo lwe-Circuit Breaker
Izinto eziphambili zovavanyo
Ukunganyangeki okutshintshileyo/okuguquguqukayo koqhagamshelwano: Fumana ilahleko yoqhagamshelwano 12.

Uhlalutyo lweempawu zoomatshini: Ixesha lokuvula kunye nokuvala, isantya kunye nexesha elinye 14.

Ukusebenza kwe-insulation: Ukumelana novavanyo lombane, ukufunyanwa kweqondo le-vacuum (kwi-vacuum circuit breakers) 14.

Ukuqinisekiswa komsebenzi wokhuseleko: Ulungelelwaniso lomthwalo ogqithisileyo kunye namaxabiso entshukumo yohambo olufutshane lwesekethe 8.

Amanqaku aphambili olondolozo
Ukuhlolwa rhoqo: Uxinzelelo lwegesi (i-SF6 i-circuit breaker), i-contact ablation, i-lubrication ye-48.

Iimvavanyo zokuthintela: Zenziwa ngokuhambelana nemigangatho efana ne-GB/T 1984 kunye ne-GB 14048, kanye rhoqo kwi-1 ukuya kwiminyaka eyi-3.

Ukuphathwa kwempazamo: Kwimeko yokunqongophala kwe-oyile, ukufudumala okanye ukuqhuma, ukuhlukaniswa okungxamisekileyo kuyadingeka kwaye iingxaki zoqhagamshelwano okanye inkqubo yokucima i-arc kufuneka iphandwe. 4.

V. Uhlalutyo lweengxaki eziqhelekileyo
Umahluko phakathi kwe-breaker circuit kunye ne-disconnector
I-disconnector (QS) isetyenziselwa kuphela ukwahlula unikezelo lwamandla kwaye akukho mandla okucima i-arc. I-circuit breaker (QF) inokunqumla i-fault current ye-12.

Ukubaluleka kwe-Icu kunye ne-Ics
I-Icu ibonisa amandla okugqibela okuphuka, kwaye i-Ics ibonisa ukuthembeka kokusebenza okuqhubekayo. Imigca ephambili igxile kwi-Ics, ngelixa imigca yesebe igxile kwi-Icu8.

Ukukhethwa kwee-breaker circuit-limiting current
Tshatisa uxinzelelo lwe-thermal lwentambo ngegophe elinomda wangoku, kwaye unike kuqala iimodeli ezinesantya esikhawulezayo sokuqhawuka (ezifana ne-vacuum circuit breakers) 78.

Ukhuseleko lokuvuza alusebenzi kakuhle
Ubukhulu becala ngenxa yokuhla kwe-insulation ye-line okanye i-grounding engafanelekanga, kuyimfuneko ukufumanisa ukuvuza kwangoku kunye nokulungelelanisa umda wesenzo (ngokuqhelekileyo i-30mA ukuya kwi-300mA)