Ukuqonda Iimpawu Zokuqhekeza Amandla kunye Nokuhamba kwe-250 Amp MCCB

1. Intshayelelo: Kutheni Ukwaphula Amandla kunye neempawu zokuHamba Kubalulekile

Kwiinkqubo zanamhlanje zokusasazwa kwamandla aphantsi, ukhuseleko lwesekethe lubalulekile kukhuseleko kunye nokuqhubeka kokusebenza. IiMolded Case Circuit Breakers (MCCBs) zisetyenziswa kakhulu ukukhusela iintambo, izixhobo, kunye nemithwalo kwimithwalo egqithisileyo kunye ne-short circuits.
Phakathi kovavanyo oluqhelekileyo,I-250 Amp MCCB Isetyenziswa rhoqo kwizakhiwo zorhwebo nakwiindawo ezifakelweyo zemizi-mveliso, apho ukuqonda amandla okuphuka kunye nokuziphatha kokukhubeka kubalulekile kuyilo olufanelekileyo lwenkqubo.

2. Kuthetha ukuthini ukuPhula amandla kunye nesizathu sokuba kubalulekile kukhuseleko lwesekethe

Umthamo wokuqhekeza ubhekisa kumthamo omkhulu wempazamo onokuphazanyiswa yi-circuit breaker ngaphandle komonakalo. Ngokwesiqhelo uchazwa ziiparameter ezimbini ezibalulekileyo: umthamo wokugqibela wokuqhekeza (Icu) kunye nomthamo wokuqhekeza inkonzo (Ics).
Ukukhetha i-breaker enomthamo owaneleyo wokuqhekeka kuqinisekisa ukuba, ngexesha lesiganeko se-short-circuit, isixhobo sinokuphazamisa i-fault current ngaphandle kokubangela ukusilela okukhulu okanye iingozi zesibini. Oku kubaluleke kakhulu kwiinkqubo ezine-short-circuit currents eziphezulu.

3. Ukusebenza kweSijikelezo esifutshane kunye nokuphazamiseka kwangoku kwempazamo

Xa kwenzeka i-short circuit, i-currents ephezulu kakhulu idlula kwinkqubo ngexesha elifutshane kakhulu. Ii-MCCB zenzelwe ukuvula oonxibelelwano ngokukhawuleza ngelixa zilawula amandla obushushu kunye ne-electromagnetic aveliswa ngexesha lokuphazamiseka kwempazamo.
Ukusebenza kakuhle kwale nkqubo kuchaphazela ngqo ukhuseleko lwenkqubo, kunciphisa umonakalo kwizixhobo ezisezantsi kunye nokunciphisa umngcipheko weempazamo ze-arc. Uvavanyo olufanelekileyo lokusebenza kwe-short-circuit lunceda iinjineli ukuqinisekisa ukususwa kweempazamo okuthembekileyo.

4. Iintlobo zeeYunithi zohambo kunye nezicwangciso zoKhuseleko oluLungisekayo

Ii-MCCB zihlala zixhotyiswe ngeeyunithi zokuhamba nge-thermal-magnetic okanye nge-electronic. Iiyunithi ze-thermal-magnetic zibonelela ngokugqithisa okuthembekileyo kunye nokukhuselwa kwe-short-circuit kwangoko, ngelixa iiyunithi zokuhamba nge-elektroniki zibonelela ngokuchaneka okukhulu kunye nokulungelelaniswa.
Useto oluhlengahlengiswayo luvumela iiparameter zokhuseleko ukuba zilungelelaniswe neemeko zomthwalo wokwenyani, ziphucula ulungelelwaniso kwaye zinciphise ukukhubeka kwengxaki. Kwizicelo kusetyenziswa i-I-250 Amp MCCB, olu kuguquguquka luxhasa ukuthembeka kokhuseleko kunye nokusebenza kakuhle.

5. Ukulungelelanisa iimpawu zohambo neemfuno zomthwalo wenkqubo

Iimpawu zokuhamba kufuneka zihambelane neprofayili yomthwalo wombane ukuqinisekisa ukhuseleko olusebenzayo. Ukulungelelaniswa okufanelekileyo kuthintela ukuphazamiseka okungeyomfuneko ngelixa kugcinwa ukukhetha phakathi kwezixhobo ezisezantsi neziphezulu.
Iinkqubo zokukhusela ezilungelelaniswe kakuhle ziphucula uzinzo lwenkqubo kwaye zinceda ukugcina inkonzo iqhubeka, ingakumbi kwiindawo apho ixesha lokusebenza liyimfuneko ebalulekileyo.

6. Iingqwalasela zeMigangatho, Uvavanyo, kunye nokuThotyelwa koKhuseleko

Imigangatho yamazwe ngamazwe efana ne-IEC 60947-2 kunye ne-UL 489 ichaza iimfuno zokusebenza, uvavanyo, kunye nokhuseleko lwee-MCCB. Ukuthobela le migangatho kuqinisekisa ukuba izixhobo zisebenza njengoko kulindelekile phantsi kweemeko zempazamo.
Ukusebenzisa iimveliso eziqinisekisiweyo kunye nokulandela iindlela ezifanelekileyo zokufakela kunye nokufaka izixhobo kuphucula ukuthembeka kwexesha elide.I-250 Amp MCCBayihlangabezani neemfuno zomthetho kuphela kodwa ikwaxhasa nokusasazwa kwamandla okukhuselekileyo nokuthembekileyo.

7. Isiphelo: Ukwenza Ukhetho Oluchanekileyo Lokukhusela Isekethe Ethembekileyo

Ukwaphuka komthamo kunye neempawu zokujika zezona zinto zibalulekileyo ekukhetheni i-MCCB. Ukuqonda ezi parameters kuvumela iinjineli kunye nabaphathi bezakhiwo ukuba bayile iinkqubo zombane ezikhuselekileyo nezithembekileyo.
Ngokudibanisa ngononophelo iimpawu zokhuseleko neemfuno zenkqubo, imibutho inokunciphisa umngcipheko, inciphise ixesha lokungasebenzi, kwaye iqinisekise uzinzo lokusebenza ixesha elide.

FAQ

Umbuzo 1: Yintoni umahluko phakathi kwe-Icu kunye ne-Ics?
I-Icu yeyona current iphezulu yempazamo enokuthi i-breaker iyiphazamise, ngelixa i-Ics imele i-current yempazamo enokuthi iyiphazamise kwaye isakwazi ukuyilungisa emva koko.

Umbuzo 2: Ngaba iiyunithi zokuhamba nge-elektroniki zingcono kunezo ze-thermal-magnetic?
Iiyunithi zokuhamba nge-elektroniki zibonelela ngokuchanekileyo okuphezulu kunye noseto oluhlengahlengiswayo, kodwa iiyunithi ze-thermal-magnetic zihlala zithembekile kwaye zingabizi kakhulu kwiintlobo ezininzi zezicelo.

UMBUZO 3: Iimpawu zohambo zichaphazela njani ukulungelelaniswa kwenkqubo?
Ii-trip curves ezikhethwe ngokufanelekileyo ziqinisekisa ukuba i-dispersion iyakhubeka, nto leyo evumela kuphela i-circuit enengxaki ukuba yahlulwe ngaphandle kokuchaphazela yonke inkqubo.

Umbuzo 4: Kutheni ukuqhekeza umthamo kubaluleke kangaka ekukhetheni i-MCCB?
Ukungasebenzi kakuhle komthamo wokuqhekeza kunokubangela ukuba i-breaker ingasebenzi kakuhle ngexesha le-short circuit, nto leyo ebangela umngcipheko omkhulu wokhuseleko kunye nezixhobo.

Iireferensi

• I-IEC 60947-2: Iswitshi ye-voltage ephantsi kunye negiya yokulawula - Abaphuli besekethe

• I-UL 489: Ii-Molded-Case Circuit Breakers, ii-Molded-Case Switches, kunye nee-Circuit-Breaker Enclosures

• IEEE Std 242 (Buff Book): Ukhuselo kunye noLungelelaniso lweeNkqubo zamandla eMizi-mveliso kunye nezoRhwebo