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 yokunweba yohlangothi lohlangothi oluphansi lokugoba, ukusetshenziswa kwe-curvature ukukhuthaza ukukhululwa kokunyakaza kwenduku, ukuqaliswa kokukhululwa. isenzo sokukhubeka, ukuze ubone ukuvikeleka kokugcwala 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-breaker circuit 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