I-icro Circuit Breaker (i-MCB ngamafuphi) ingenye yezinto ezisetshenziswa kakhulu ezivikela isiphetho kumadivayisi okusabalalisa amandla kagesi. Ivamise ukusetshenziselwa umjikelezo omfishane wesigaba esisodwa nesigaba sesithathu, ukuvikela ukulayisha ngokweqile nokweqile kwe-voltage ngaphansi kwe-125A, futhi ngokuvamile itholakala ngezinketho ze-single-pole, i-double-pole, izigxobo ezintathu kanye nezigxobo ezine. Umsebenzi oyinhloko we-miniature circuit breaker (MCB) ukushintsha isekethe, okungukuthi lapho i-current ngokusebenzisa i-miniature circuit breaker (MCB) idlula inani elibekwe yiyo, izophula ngokuzenzakalelayo isekethe ngemva kwesikhathi esithile sokulibaziseka. Uma kudingekile, ingaphinda ivule futhi ivale isekethe ngesandla njengeswishi evamile.
I-Miniature Circuit Breaker (MCB) Isakhiwo kanye Nomgomo Wokusebenza
Ama-Miniature Circuit Breakers (MCB) enziwe ngezinto zokuvikela i-thermoplastic ezibunjwe endlini enemishini emihle, eshisayo kanye ne-insulating. Isistimu yokushintsha iqukethe othintana nabo abangaguquki nabanyakazayo abaxhumene nabo kanye nezintambo eziphumayo ezixhunywe ndawonye kanye nokulayisha amatheminali. Oxhumana nabo kanye nezingxenye eziphethe zamanje zenziwe ngethusi le-electrolytic noma i-alloys yesiliva, okukhethwa kukho okuncike ekulinganiseni kwamanje kwe-voltage ye-breaker circuit.
Lapho oxhumana nabo behlukana ngaphansi kwezimo zokugcwala ngokweqile noma zesekethe emfushane, kwakheka i-arc. I-modern miniature circuit breaker (MCB) isetshenziselwa ukuphazamisa noma ukuqeda idizayini ye-arc, ukumuncwa kwamandla e-arc kanye nokupholisa ngegumbi lokucisha i-arc ku-arc spacer yensimbi ukuze kubonwe, lezi zikhala ze-arc ezinobakaki abavalekile ezimiswe endaweni efanele. Ukwengeza, ukusetshenziswa kwamandla kagesi wesekethe ye-conductor (ama-circuit breaker manje anesakhiwo esinqunyelwe samanje ukuze kuthuthukiswe umthamo wokuphuka womkhiqizo) noma ukuvunguza kazibuthe, ukuze i-arc ihambe ngokushesha futhi yelulwe, ngokusebenzisa isiteshi sokugeleza kwe-arc singene egumbini lesiphazamisi. .
I-Miniature circuit breaker (MCB) indlela yokusebenza iqukethe idivayisi yokukhishwa kazibuthe ye-solenoid kanye nedivayisi yokukhishwa kwe-bimetal thermal. Idivayisi yokukhumula kazibuthe empeleni iyisekhethi kazibuthe. Lapho i-current evamile idluliswa emgqeni, amandla kazibuthe kagesi akhiqizwe i-solenoid angaphansi kwe-spring tension ukuze enze amandla okusabela, i-armature ayikwazi ukumuncwa i-solenoid, futhi i-circuit breaker isebenza ngokujwayelekile. Uma kukhona iphutha le-short-circuit emugqeni, i-current idlula izikhathi ezimbalwa kunejwayelekile, amandla kazibuthe akhiqizwa yi-electromagnetic force makhulu kunamandla okusabela entwasahlobo, i-armature imuncwa uzibuthe kagesi ngokudlulisela indlela yokuphromotha indlela yokukhulula yamahhala yokukhulula abathintwayo abakhulu. Othintana naye oyinhloko uhlukaniswe ngaphansi kwesenzo se-breaking spring ukusika umjikelezo ukuze udlale indima yokuvikela isikhashana.
Ingxenye eyinhloko kudivayisi yokukhishwa kwe-thermal yi-bimetal, ngokuvamile ecindezelwa ezinsimbi ezimbili ezihlukene noma ama-alloys ensimbi. Ingxubevange yensimbi noma yensimbi inesici, okungukuthi, insimbi ehlukile noma i-alloy yensimbi lapho kushisa, ukunwetshwa koshintsho lwevolumu akuhambisani, ngakho-ke lapho kushisa, ukwakheka kwezinto ezimbili ezihlukene zensimbi noma i-alloy ye-bimetallic. ishidi, kuzoba ku-coefficient yokunwetshwa yohlangothi lohlangothi oluphansi lokugoba, ukusetshenziswa kokugoba ukukhuthaza ukukhululwa kokunyakaza kwenduku, ukuqaliswa kwesenzo sokukhubeka sokukhululwa, ukuze kubonwe ukuvikelwa kokulayisha ngokweqile. Njengoba ukuvikela ukugcwala ngokweqile kubonakala ngomphumela wokushisa, kwaziwa nangokuthi ukukhululwa kwe-thermal.
Ukukhethwa kwezigxobo ezi-1, 2, 3 nezi-4 ze-breaker circuit encane
Ama-Single-pole miniature circuit breaker asetshenziselwa ukuhlinzeka ngokushintsha nokuvikela isigaba esisodwa sesekhethi. Lawa ma-circuit breaker aklanyelwe ikakhulukazi amasekhethi ama-voltage aphansi. Lawa ma-circuit breaker asiza ekulawuleni izintambo ezithile, izinhlelo zokukhanyisa noma izitolo ezisendlini. Lezi zingabuye zisetshenziselwe ukuhlanza, izindawo zokukhanyisa ezijwayelekile, izibani zangaphandle, amafeni nama-blower njll.
Ama-circuit breaker amancane aphindwe kabili ngokuvamile asetshenziswa kumaphaneli eyunithi yokulawula abathengi njengamaswishi amakhulu. Kusukela kumitha yamandla, amandla ahlakazeka kuwo wonke ama-circuit breaker kuya ezingxenyeni ezihlukene zendlu. Izigebengu eziphindwe kabili zezigxobo ezincane zisetshenziselwa ukuhlinzeka ngokuvikeleka nokushintsha izintambo zesigaba nezimaphakathi.
Ama-circuit breaker amancane anezigxobo ezintathu asetshenziselwa ukuhlinzeka ngokushintsha nokuvikela kuphela izigaba ezintathu zesekethe, hhayi ukungathathi hlangothi.
I-four-pole miniature breaker, ngaphezu kokuhlinzeka ngokushintsha nokuvikela izigaba ezintathu zesekhethi, inomgadli ovikelayo ngokuyinhloko wesigxobo esimaphakathi (isb, isigxobo esingu-N). Ngakho-ke, i-four-pole miniature breaker kufanele isetshenziswe noma nini lapho ama-currents aphezulu angathathi hlangothi angaba khona kuwo wonke umjikelezo.
I-Miniature circuit breaker A (Z), B, C, D, K yokukhetha uhlobo lwejika
(1) A (Z) uhlobo lwe-circuit breaker: izikhathi ezi-2-3 zikalwe ngokwamanje, azivamile ukusetshenziswa, ngokuvamile zisetshenziselwa ukuvikelwa kwe-semiconductor (amafusi avame ukusetshenziswa)
(2) I-circuit breaker yohlobo lwe-B: izikhathi ezi-3-5 kuneyamanje elinganiselwe, evame ukusetshenziselwa imithwalo eqinile ephikisayo namasekhethi okukhanyisa anamandla kagesi aphansi, evame ukusetshenziswa ebhokisini lokusabalalisa lemizi ukuze kuvikelwe izinto zikagesi zasendlini nokuphepha komuntu siqu, esetshenziswa kancane okwamanje. .
(3) I-C-type breaker breaker: izikhathi ezingu-5-10 zamanje ezilinganiselwe, zidinga ukukhululwa phakathi kwemizuzwana engu-0.1, izici ze-breaker circuit zivame ukusetshenziswa, ezivame ukusetshenziswa ekuvikelweni kwemigqa yokusabalalisa kanye namasekethe okukhanyisa ngokujika okuphezulu. -kumanje.
(4) I-circuit breaker yohlobo lwe-D: izikhathi eziyi-10-20 kunamanje okalwe, ikakhulukazi endaweni yamandla kagesi aphezulu ngokushesha, ngokuvamile asetshenziswa kancane emndenini, emithwalweni ephezulu engenisa amandla kanye nesistimu enkulu yamanje ye-inrush, esetshenziswa kakhulu ukuvikelwa kwemishini ene-inrush current ephezulu.
(5) Isiphazamiso sohlobo lwe-K: izikhathi ezingu-8-12 zamanje ezilinganiselwe, zidinga ukuba ngamasekhondi angu-0.1. Umsebenzi oyinhloko we-k-type miniature circuit breaker ukuvikela nokulawula isiguquli, amasekhethi asizayo namamotho kanye namanye amasekhethi ukusuka kumjikelezo omfushane nokulayisha ngokweqile. Ifanele ukulayishwa kwe-inductive kanye ne-motor enama-inrush currents aphezulu.
Isikhathi sokuthumela: Apr-09-2024