Ukubuyekezwa kwe-Circuit Breakers
I-Circuit Breaker iyisisetshenziswa esibalulekile kusistimu yamandla esetshenziselwa ukuvikela nokulawula amasekhethi. Ingavala, ithwale futhi iphule amandla ngaphansi kwezimo ezijwayelekile noma zephutha. Imisebenzi yayo eyinhloko ihlanganisa ukuvikela ukulayisha ngokweqile, ukuvikela isifunda esifushane, ukuvikelwa kwe-undervoltage, njll. Ilingana nenhlanganisela yamafuse kanye nama-thermal adluliselwe ngaphezulu/ngaphansi kwe-voltage, kodwa inokwethenjelwa okuphezulu nokusebenziseka kabusha.

Imingcele yesici esiyinhloko
I-voltage elinganiselwe (Ue) : I-voltage ephakeme kakhulu lapho i-breaker yesekethe isebenza ngokujwayelekile, njenge-220V, 380V, njll. 37

Isilinganiso samanje (Ngaphakathi) : Inani eliphezulu lamanje elingathwalwa ngokuphepha esikhathini eside, okufanele libe likhulu kunokusebenza kwamanje kwesekethe ngo-35%.

Umthamo wokuphula (Icu/Ics) : Umthamo wokugcina wokuphuka kwesekethe emfishane (Icu) isho ikhono lokunqamula umthamo omkhulu wamanje wesiyingi esifushane ngesikhathi esisodwa. Operating breaking capacity (Ics) isho umkhawulo wamanje osengasetshenziswa ngemva kokuphuka. Ngokuvamile, ama-breaker circuit breaker adinga i-Ics≥50%Icu, futhi ama-circuit breaker abunjiwe adinga i-Ics≥25% ICU.

Ukumelana nesikhathi esifushane (Icw) : Ikhono le-circuit breaker ukuze limelane nomjikelezo wesifunda esifushane phakathi nesikhathi esicacisiwe ngaphandle kokulimala.

Ii. Ukuhlukaniswa kwama-Circuit Breakers
1. Ngezinga le-voltage
Ama-circuit breaker ane-voltage ephezulu: Asetshenziswa kumasistimu angu-3kV nangaphezulu. Imidiya evamile yokucisha i-arc ihlanganisa i-sulphur hexafluoride (SF6), i-vacuum, uwoyela, njll. 4

Ama-circuit breaker ane-voltage ephansi ahlukaniswa abe izinhlobo ezintathu: uhlobo lozimele (ACB), uhlobo lwekesi elibunjiwe (MCCB), nohlobo oluncane (MCB). 57.

2. Ngesakhiwo nangokusebenzisa
Uhlobo lohlaka lwe-circuit breaker (ACB
Isilinganiso samanje: 200A kuya ku-6300A, ifakwe ukuvikelwa kwezigaba ezine (ukubambezeleka okude, ukubambezeleka okufushane, iphutha elisheshayo, kanye nephutha lomhlabathi), isetshenziselwa kakhulu ukuvikela ukushintsha okuyinhloko ezinhlelweni zokusabalalisa noma imishini emikhulu.

I-Molded case circuit breaker (MCCB
Isakhiwo esihlangene, esilinganiselwe ku-10A samanje ku-1600A, esifanele ukuvikelwa kwesifunda segatsha. I-MCCB ye-elekthronikhi isekela ukuvikelwa okukhethiwe, futhi amanye amamodeli anomsebenzi wokukhiya kwesifunda 57.

I-Miniature Circuit Breaker (MCB
Isetshenziswa kumasekethe esitheminali angaphansi kuka-125A (njengawasendlini nakwezentengiso), atholakala ku-1P kuya ku-4P imininingwane, futhi isekela ukulayisha ngokweqile, ukujikeleza okufushane nokuvikela ukuvuza.

3. Cindezela ubuchwepheshe bokucima i-arc
I-vacuum circuit breaker: Ukucima i-arc okusheshayo, impilo ende yesevisi, ilungele izimo zokusebenza ezivamile 4.

I-SF6 circuit breaker: Ine-insulation enhle kakhulu nokusebenza kokucisha i-arc futhi isetshenziswa kakhulu ezinhlelweni zamandla kagesi aphezulu. Ukuhlanzeka kwegesi kudinga ukuhlolwa njalo.

Iii. Izimiso Zokukhetha I-Circuit Breaker
Qondanisa amapharamitha wesifunda
I-voltage elinganiselwe ≥ i-voltage yomugqa, ikalwe yamanje ≥ ubukhulu bomthwalo wamanje, umthamo wokuphuka ≥ okulindelekile okwamanje wesekethe emfushane 57.

Ukulayisha uhlobo lokujwayela
Ukuvikelwa kwezimoto kudinga ukucabangela isikhathi sokuqala (inani lokusetha uhambo olusheshayo liyizikhathi ezingu-1.35 ukuya kwezingu-1.7 kunomanje wokuqala). Isekhethi yokukhanyisa ithatha izikhathi eziyisithupha kunomthwalo wamanje ongu-78.

Ukuxhumana okukhethiwe
Ama-breaker circuit angaphezulu naphansi adinga ukuhlangabezana nomehluko wesikhathi (njengomehluko wesenzo sokulibaziseka okufushane ≥0.1s) kanye nomehluko wamanje (isenzo samanje sezinga eliphezulu ≥ izikhathi ezingu-1.2 kuleveli ephansi) ukuze kugwenywe ukukhubeka ngokweqile.

Ukuvumelana nezimo zemvelo
Ezindaweni eziphakeme kakhulu, eziswakeme noma ezinezinga lokushisa eliphezulu, amamodeli akhethekile kufanele akhethwe futhi alinganiselwe manje alungiswe (ukunciphisa umthamo kuyadingeka uma izinga lokushisa lingaphezu kuka-40℃). 13.

Iv. Ukuhlolwa Kwe-Circuit Breaker Nokugcinwa
Izinto ezibalulekile zokuhlola
Ukumelana nokuxhumana okuqinile/okuguquguqukayo: Thola ukulahleka kothintana naye 12.

Ukuhlaziywa kwesici semishini: Isikhathi sokuvula nesokuvala, isivinini kanye nesikhathi esisodwa 14.

Ukusebenza kwe-insulation: Ukumelana nokuhlolwa kwe-voltage, ukutholwa kwe-vacuum degree (kuma-vacuum circuit breakers) 14.

Ukuqinisekiswa komsebenzi wokuvikela: Ukulinganiswa komthwalo omningi kanye namanani esenzo sokukhubeka kwesiyingi esifushane 8.

Amaphuzu abalulekile okunakekela
Ukuhlola okuvamile: Ingcindezi yegesi (i-SF6 circuit breaker), i-ablation yokuxhumana, ukugcotshwa kwemishini 48.

Ukuhlolwa kokuvimbela: Kwenziwa ngokuhambisana namazinga afana ne-GB/T 1984 ne-GB 14048, kanye njalo eminyakeni engu-1 kuya kwemi-3.

Ukuphatha iphutha: Uma uwoyela eshoda, ukushisa ngokweqile noma ukuqhuma, ukuhlukaniswa okuphuthumayo kuyadingeka futhi izinkinga zokuthintana noma isistimu yokucisha i-arc kufanele iphenywe. 4.

V. Ukuhlaziywa Kwezinkinga Ezivamile
Umehluko phakathi kwe-circuit breaker nesixhumi
Isinqamuli (i-QS) sisetshenziswa kuphela ukuhlukanisa ukunikezwa kwamandla futhi asinawo amandla okucima i-arc. I-circuit breaker (QF) inganqamula iphutha lamanje lika-12.

Ukubaluleka kwe-Icu ne-Ics
I-Icu ibonisa amandla okugcina okuphuka, futhi i-Ics ibonisa ukwethembeka komsebenzi oqhubekayo. Imigqa eyinhloko igxile ku-Ics, kuyilapho imigqa yegatsha igxile ku-Icu8.

Ukukhethwa kwama-circuit breaker anomkhawulo wamanje
Qondanisa ukucindezelwa okushisayo kwekhebula ngejika lamanje elikhawulelayo, futhi ubeke kuqala amamodeli anesivinini sokuphuka (njengama-vacuum circuit breaker) 78.

Ukuvikela ukuvuza akuphumelelanga
Ikakhulukazi ngenxa yokwehla kokufakwa kolayini noma ukungagxili kahle komugqa, kuyadingeka ukuthola ukuvuza kwamanje futhi ulungise umkhawulo wesenzo (ngokuvamile u-30mA ukuya ku-300mA)