IINDABA

Ityala lesekethe elibunjiweyo (MCCB) luhlobo lwesixhobo sokhuselo sombane esisetyenziselwa ukukhusela isekethe yombane kwizinto ezigqithileyo, ezinokubangela umthwalo ongaphezulu okanye wesekethe emfutshane. Ngomgangatho wangoku ukuya kuthi ga kwi-1600A, ii-MCCBs zinokusetyenziselwa uluhlu olubanzi lwee-voltages kunye neefrikwensi ezinoseto lohlengahlengiso lohambo. Ezi zahluli zisetyenziswa endaweni yezahluli ezincinci zesekethe (ii-MCBs) kwiinkqubo ezinkulu ze-PV zenkqubo yokwahlulahlula kunye neenjongo zokukhusela.

Isebenza njani iMCCB

I-MCCB isebenzisa isixhobo seqondo lobushushu (i-thermal element) enesixhobo esibuhlungu se-electromagnetic device (i-magnetic element) ukubonelela ngohambo lokuzikhusela kunye nokuzimela. Oku kwenza ukuba i-MCCB ibonelele:
• Ukukhutshelwa ngaphezulu,
• Ukukhuselwa kwesiphoso soMbane kwimisinga emifutshane yesekethe
• Ukutshintsha kombane ukuze uqhawulwe.

Ukukhuselwa okugqithisileyo

Ukukhuseleka ngaphezulu kunikezelwa yi-MCCB ngokusebenzisa icandelo lobushushu. Eli candelo ikakhulu liqhakamshelwano lwe-bimetallic: umfowunelwa oqukethe izinyithi ezibini ezandayo kumanqanaba ahlukeneyo xa evezwe kubushushu obuphezulu. Ngexesha lemihla yokusebenza eqhelekileyo, uqhakamshelwano lwebimetallic luya kuvumela umbane ukuba uhambe nge-MCCB. Xa okwangoku kugqitha kwixabiso lohambo, unxibelelwano lwe-bimetallic luza kuqala ukufudumeza kwaye luguqe ngenxa yeqondo le-thermal eyahlukeneyo yokwanda kobushushu kunxibelelwano. Ekugqibeleni, umnxibelelwano uya kuguqa ukuya kwinqanaba lokunyusa ibha yohambo kunye nokukhulula abafowunelwa, kubangele ukuba isiphaluka siphazanyiswe.

Ukukhuselwa kobushushu be-MCCB kuya kuba nexesha lokulibaziseka ukuvumela ixesha elifutshane lokugqithisa eliqhele ukubonwa kwezinye izinto zesixhobo, ezinje ngemijelo yokungena engxamisekileyo ebonwa xa kuqalwa iinjini. Eli xesha lokulibaziseka livumela isekethe ukuba iqhubeke nokusebenza kwezi meko ngaphandle kokukhubeka kwi-MCCB.

Ukukhuselwa kwetyala ngombane ngokuchasene nemisinga yesekethe emfutshane

Ii-MCCBs zibonelela ngempendulo kwangoko kwimpazamo yesekethe emfutshane, esekwe kumgaqo we-electromagnetism. I-MCCB iqulethe i-coil ye-solenoid eyenza i-electromagnetic field encinci xa idlula ngoku kwi-MCCB. Ngexesha lokusebenza okuqhelekileyo, intsimi ye-electromagnetic eveliswe yikhoyili ye-solenoid ayinanto. Nangona kunjalo, xa isiphoso sesiphaluka esifutshane sisekethe, umjelo omkhulu oqala ngokuhamba nge-solenoid kwaye, ngenxa yoko, kumiselwa indawo eqinileyo yombane etsala ibha yohambo kwaye ivule abafowunelwa.

Ukutshintsha kombane xa unqamkile

Ukongeza kwiindlela zokukhubeka, ii-MCCBs zinokusetyenziswa njengokucinywa kokucinywa ngesandla xa kukho imeko kaxakeka okanye yolondolozo. I-arc inokwenziwa xa unxibelelwano luvula. Ukulwa le nto, ii-MCCBs zinendlela yokuphelisa i-arc yangaphakathi yokucima i-arc.

Ukucaciswa kweempawu ze-MCCB kunye neMilinganiselo

Abavelisi be-MCCB bayacelwa ukuba babonelele ngeempawu zokusebenza kwe-MCCB. Ezinye zeeparameter zichaziwe apha ngezantsi:
Ikaliwe ngoku Isakhelo (Inm):
Elona xesha liphezulu langoku elilinganiswe ukuba liphathwe yi-MCCB. Isakhelo esilinganisiweyo sangoku sichaza umda ophezulu wohambo oluhlengahlengisiweyo lwangoku. Eli xabiso limisela ubungakanani besakhelo sokwaphula.
Ikaliwe ngoku (ngaphakathi):
Ixabiso elilinganisiweyo langoku limisela xa uhambo lwe-MCCB luhamba ngenxa yokhuselo olungaphezulu. Eli xabiso linokuhlengahlengiswa, ukuya kuthi ga kwisakhelo esilinganisiweyo sangoku.
Ukulinganiswa kweVoltage yokulinganisa (Ui):
Eli xabiso libonisa amandla ombane aphezulu anokuxhathisa i-MCCB kwiimeko zebhu. Umbane olinganisiweyo we-MCCB uhlala usezantsi kuneli xabiso ukubonelela ngomda wokhuseleko.
Ikaliwe iVoltage yokuSebenza (Ue):
Eli xabiso ngumbane olinganisiweyo wokusebenza ngokuqhubekayo kwe-MCCB. Kuqhelekile ngokufanayo okanye kufutshane nenkqubo yombane.
Ikaliwe Impembelelo yokuMelana neVoltage (Uimp):
Eli xabiso kukuhamba kwamandla ombane okwethutyana okwaphuka isekethe kunokumelana nokutshintsha kwemilingo okanye ukubetha kombane. Eli xabiso limisela ukubanakho kwe-MCCB yokumelana nokudlula kwimithambo. Ubungakanani obuqhelekileyo bovavanyo lokuqhutywa ngamandla yi-1.2 / 50µs.
Ukusebenza kwesekethe emfutshane yokuPhula amandla (ii-Ics):
Esi sesona siphoso siphezulu sinokuthi senziwe yi-MCCB ngaphandle kokonakala ngokusisigxina. Ii-MCCB zihlala zinokusetyenziswa kwakhona emva kokuphazanyiswa kokuphazanyiswa komsebenzi ukuba azidluli kweli xabiso. Ukuphakama kwee-Ics, kokukhona inokuthenjwa ikhefu lesekethe.
Umjikelo wokuSebenza weSekethe eNcinci yokuQhekeka (i-Icu):
Eli lelona xabiso liphezulu langoku elinokubanjwa yi-MCCB, ukuba isiphoso sangoku sidlula eli xabiso, i-MCCB ayizukukhubeka. Kule meko, enye indlela yokhuselo enesakhono sokuqhekeza ephezulu kufuneka isebenze. Oku kubonisa ukuthembeka kokusebenza kwe-MCCB Kubalulekile ukuba uqaphele ukuba ukuba isiphoso sangoku sidlula kwii-Ics kodwa singagqithi kwi-Icu, i-MCCB isengayisusa impazamo, kodwa inokonakala kwaye ifuna ukubuyiselwa.
Ubomi boomatshini: Eli lelona nani liphezulu lamaxesha apho i-MCCB inokusebenza khona ngesandla phambi kokuba isilele.
Ubomi boMbane: Eli lelona nani liphezulu lamaxesha iMCCB inokukhubeka ngaphambi kokuba isilele.

Ukulinganisa iMCCB

Ii-MCCBs kwisekethe yombane kufuneka zilinganiswe ngokokulindeleka kwesekethe yokusebenza yangoku kunye nokushukuma okunokwenzeka. Iindlela ezintathu eziphambili ngelixa ukhetha ii-MCCB zezi:
• Amandla ombane alinganisiweyo (Ue) e-MCCB kufuneka afane nevolthi yenkqubo.
• Ixabiso lohambo lwe-MCCB kufuneka luhlengahlengiswe ngokuhambelana nomthwalo okhoyo ngoku.
• Amandla okuphula i-MCCB kufuneka abe ngaphezulu kuneempazamo zethiyori ezinokubakho.

Iindidi zeMCCB

Umzobo 1: Uhambo lwegophe lohlobo B, C, kunye nee-MCCBs

Ulondolozo lwe-MCCB

Ii-MCCB ziphantsi kwemisinga ephezulu; ke ngoko ukugcinwa kwee-MCCB kubalulekile ekusebenzeni okuthembekileyo. Ezinye zeenkqubo zolondolozo zixutyushwe apha ngezantsi:

1. Uvavanyo oluBonwayo
Ngexesha lokuhlolwa okubonakalayo kwe-MCCB, kubalulekile ukuba ujonge abafowunelwa abanesiphene okanye iintanda kwi-casing okanye kwi-insulation. Nawaphi na amanqaku okutsha xa unxibelelana okanye ufaka isitshixo kufuneka uphathwe ngononophelo.

2. ukuthambisa ajikeleze
Ezinye ii-MCCB zidinga ukuthambisa ngokwaneleyo ukuze kuqinisekiswe ukusebenza kakuhle kokucinywa konxibelelwano kunye nezinto ezihamba ngaphakathi.

3. Ukucoca
Ubumdaka obufakwa kwii-MCCBs bunokuwohloka ngokubonakalayo kwi-MCCB. Ukuba ukungcola kubandakanya nayiphi na into yokuqhuba inokwenza umendo wangoku kwaye ibangele isiphoso sangaphakathi.

4. Ukuvavanya
Kukho iimvavanyo ezintathu eziphambili ezenziwa njengenxalenye yenkqubo yolondolozo lwe-MCCB.
Uvavanyo lokumelana nokuvala:
Uvavanyo lwe-MCCB kufuneka lwenziwe ngokunqamla i-MCCB kunye nokuvavanywa kobushushu phakathi kwezigaba nakulo lonke unikezelo kunye neetheminali zokulayisha. Ukuba umlinganiso wokhuselo lokulinganisa uphantsi kunexabiso elinconyelweyo lokuchasana nomenzi ke i-MCCB ayizokwazi ukubonelela ngokhuseleko olwaneleyo.

Ukumelana noQhakamshelwano
Olu vavanyo lwenziwa ngokuvavanya ukunganyaniseki koqhagamshelo lombane. Ixabiso elilinganisiweyo lithelekiswa nexabiso elichazwe ngumenzi. Phantsi kweemeko zokusebenza eziqhelekileyo, ukumelana noqhakamshelwano kusezantsi kakhulu kuba ii-MCCBs kufuneka zivumele ukusebenza kwangoku ngelahleko ezincinci.

Uvavanyo lokurhola
Olu vavanyo lwenziwa ngokuvavanya impendulo ye-MCCB phantsi kweemeko ezixeliweyo kunye neempazamo. Ukukhuselwa ngokushushu kobushushu be-MCCB kuvavanywa ngokusebenza kombane omkhulu ngoku nge-MCCB (iipesenti ezingama-300 zexabiso elilinganisiweyo). Ukuba umaphuli-mthetho uyasilela ukukhubeka, luphawu lokusilela kokhuseleko lwe-thermal. Uvavanyo lokukhuselwa ngemagnethi luqhutywa ngokuqhutywa kweempembelelo ezimfutshane zangoku eziphakamileyo kakhulu. Phantsi kweemeko eziqhelekileyo, ukukhuselwa ngemagnethi kwangoko. Olu vavanyo kufuneka luqhutyelwe esiphelweni njengoko imisinga ephezulu inyusa iqondo lobushushu labafowunelwa kunye nokugquma, kwaye oku kunokutshintsha iziphumo zezinye iimvavanyo ezimbini.

Isiphelo
Ukhetho oluchanekileyo lwee-MCCBs zesicelo esifunekayo sisitshixo ekunikezeleni ukhuseleko olwaneleyo kwiindawo ezinezixhobo zombane eziphezulu. Kukwabalulekile ukwenziwa kwezenzo zolondolozo rhoqo kwaye ixesha ngalinye emva kokuba kwenziwe iindlela zokuqinisekisa ukuba ukhuseleko lwesiza luyagcinwa.