I-MCB (ikhefu elincinci lesekethe)
Iimpawu
Ikaliwe ngoku ingekho ngaphezulu kwe-125 A.
• Iimpawu zohambo azihlali zilungelelaniswa.
• Ukusebenza kwe-thermal okanye ye-thermal-magnetic.
I-MCCB (ityala lesekethe elibunjiweyo)
Iimpawu
Ikaliwe ngoku ukuya kuthi ga kwi-1600 A.
Uhambo lwangoku lunokuhlengahlengiswa.
• Ukusebenza kwe-thermal okanye ye-thermal-magnetic.
Isekethe yomoya
Iimpawu
Ikaliwe ngoku ukuya kuthi ga kwi-10,000 A.
• Iimpawu zohambo zihlala zihlengahlengiswa ngokupheleleyo kubandakanya imingcele yohambo kunye nokulibaziseka.
• Ngokwesiqhelo ilawulwa ngombane — ezinye iimodeli zilawulwa ngemicroprocessor.
Isoloko isetyenziselwa ukuhambisa amandla amakhulu kumzi mveliso omkhulu wemizi-mveliso, apho iikreleksi zicwangciswe khona ngaphakathi ukuze zikulondoloze.
Umshini wesekethe wesekethe
Iimpawu
Ngokulinganiselwa okwangoku ukuya kuthi ga kwi-3000 A,
Ezi qhekeza ziphazamisa i-arc kwibhotile ye-vacuum.
• Ezi zinokusetyenziswa ukuya kuthi ga kwi-35,000 V. Iziqhekezi zesekethe ezincamathelayo zihlala zinolindelo lobomi obude phakathi kokulungiswa okungaphezulu kunoko kwenzekayo kwiziqhushumbisi zomoya.
I-RCD (isixhobo esishiyekileyo sangoku / i-RCCB (ikhefu lesekethe elishiyekileyo)
Iimpawu
• Isigaba (umgca) kunye nokungathathi cala zombini zombini iingcingo ziqhagamshelwe nge-RCD.
• Ihamba isekethe xa kukho umhlaba okhoyo ngoku.
• Ixabiso lokuhamba ngoku kwinqanaba (umgca) kufuneka libuye ngokungathathi cala.
• Ifumanisa nge-RCD. nakuphi na ukungangqinelani phakathi kwemisinga emibini ehamba ngesigaba kunye nokungathathi hlangothi ngokubona nge -RCD kunye nokuhamba kwesekethe ngaphakathi kwe-30Miliseconed.
• Ukuba indlu inesixokelelwano somhlaba esiqhagamshelwe kwintonga yomhlaba hayi intambo ephambili engenayo, kufuneka ke ukuba zonke iisekethe zikhuselwe yi-RCD (kuba u-mite awunakho ukufumana isiphoso esaneleyo sokukhubazeka iMBB)
• Ii-RCDs zilolona hlobo lusebenzayo lokuzikhusela kukothuka
Ezona zisetyenziswa kakhulu zii-30 mA (milliamp) kunye nezixhobo ze-100 mA. Ukuhamba ngoku kwe-30 mA (okanye i-0.03 amps) kuncinci ngokwaneleyo kangangokuba kwenza ukuba kube nzima ukufumana umothuko oyingozi. Nokuba i-100 mA linani elincinci xa kuthelekiswa nexesha langoku elinokuhamba kwisiphoso somhlaba ngaphandle kokhuseleko (ikhulu leeamps)
I-300/500 mA RCCB inokusetyenziswa apho kufuneka kuphela ukukhusela umlilo. Umzekelo., kwiisekethi zokukhanyisa, apho umngcipheko wothuko lombane umncinci.
Umda weRCCB
• Imigangatho ye-RCCBs yombane eyilelwe ukuba isebenze kwiifom zokuhambisa umbane eziqhelekileyo kwaye ayinakuqinisekiswa ukuba isebenze apho kungekho miqobo imiselweyo iveliswayo yimithwalo. Eyona nto ixhaphakileyo sisiqingatha sokulungiswa kwamaza alungisiweyo ngamanye amaxesha abizwa ngokuba yi-pulsating dc eveliswa zizixhobo zokulawula isantya, ii-semi condors, iikhompyuter kunye nokufiphala.
• Ii-RCCB eziguqulweyo ngokukodwa ziyafumaneka eziza kusebenza kwi-ac eqhelekileyo kunye ne-pulsating dc.
• Ii-RCDs aziboneleli ngokhuseleko kumthwalo ongaphezulu ngoku: Ii-RCDs zibona ukungalingani kwimisinga ephilayo nengathathi cala. Ukulayisha ngaphezulu, nangona kunjalo kukhulu, akufumaneki. Ngunobangela oqhelekileyo weengxaki zee-novices zokutshintsha i-MCB kwibhokisi yefuse ene-RCD. Oku kunokwenziwa ngelinge lokunyusa ukhuselo lokothuka. Ukuba isiphoso esingathathi cala siphila (isekethe emfutshane, okanye umthwalo ongaphezulu), i-RCD ayizukuhamba, kwaye inokonakala. Ukuziqhelanisa, i-MCB ephambili yesakhiwo iya kuthi ikhubeke, okanye i-fuse yenkonzo, ke imeko ayinakulindeleka ukuba ikhokelele kwintlekele; kodwa isenokungathandeki.
• Ngoku kuyenzeka ukuba ufumane i-MCB kunye ne-RCD kwiyunithi enye, ebizwa ngokuba yi-RCBO (jonga ngezantsi). Ukutshintsha i-MCB nge-RCBO yenqanaba elifanayo kukhuselekile ngokubanzi.
• Ukukhubeka kwinkathazo ye-RCCB: Utshintsho ngequbuliso kumthwalo wombane kunokubangela ukuhamba okufutshane okufutshane okukhoyo emhlabeni, ngakumbi kwizixhobo ezindala. Ii-RCDs zibuthathaka kwaye zisebenza ngokukhawuleza okukhulu; Banokukhubeka xa imoto yesikhenkcezisi esidala icima. Ezinye izixhobo zidume ngokuba `` zivuza '', oko kukuthi, zivelisa ukuhamba okuncinci okuqhubekayo okukhoyo ngoku emhlabeni. Ezinye iintlobo zezixhobo zekhompyuter, kunye neethelevishini ezinkulu, zixelwa ngokubanzi ukuba zibangela iingxaki.
• I-RCD ayizukukhusela isokethi efakelwe iintambo kunye nezitishi zayo eziphilayo nezingathathi cala ngendlela engalunganga.
• I-RCD ayizukukhusela kubushushu obugqithisileyo obubangelwa xa abaqhubi bengafakwanga ngokufanelekileyo kwiitheminali zabo.
• I-RCD ayizukukhusela kukothuka okungathath'icala, kuba izinto ezikhoyo ngoku nezingathathi cala zilungelelanisiwe. Ke ukuba uchukumisa abaqhubi ababukhoma nabangathathi hlangothi ngaxeshanye (umzekelo, zombini iiterminal zokufakwa kokukhanya), usengothuka kakubi.
I-ELCB (uMphuli weSekethe ovuza ukuvuza)
Iimpawu
• Isigaba (umgca), ucingo olungathathi cala kunye noMhlaba uqhagamshelwe kwi-ELCB.
• I-ELCB isebenza ngokusekwe kukuvuza komhlaba ngoku.
Ixesha lokuSebenza le-ELCB:
Umda okhuselekileyo wangoku weBhunga loLuntu onokumelana nawo ngama-30ma sec.
• Cinga ukuba ukunganyangeki komzimba womntu ngu-500Ω kwaye i-Voltage emhlabeni yi-230 Volt.
Umzimba okwangoku uza kuba yi-500/230 = 460mA.
• Kungoko i-ELCB kufuneka iqhutywe nge-30maSec / 460mA = 0.65msec.
I-RCBO (Isaphuli seSekethe eshiyekileyo esine-OverLoad)
Umahluko phakathi kwe-ELCB kunye ne-RCCB
• I-ELCB ligama elidala kwaye ihlala ibhekisa kwizixhobo ezisebenza ngombane ezingasafumanekiyo kwaye kuyacetyiswa ukuba ubeke endaweni yazo ukuba uyifumene.
• I-RCCB okanye i-RCD ligama elitsha elichaza ukusebenza okukhoyo ngoku (yiyo loo nto igama elitsha ukwahlulahlula kumandla ombane asebenzayo).
• I-RCCB entsha yeyona ibalaseleyo kuba iya kukhangela nasiphi na isiphoso somhlaba. Uhlobo lwevolthi lubona kuphela iimpazamo zomhlaba ezihamba zibuyele ngocingo oluphambili lomhlaba kungoko ziyekile ukusetyenziswa.
• Indlela elula yokuxelela uhambo oludala lwamandla ombane kukujonga ucingo olusisiseko oludityaniswe ngalo.
• I-RCCB iya kuba nomnxeba kunye nonxibelelwano olungathathi cala.
• I-ELCB isebenza ngokusekwe kukuvuza komhlaba ngoku. Kodwa i-RCCB ayinalo uvakalelo okanye unxibelelwano loMhlaba, kuba ngokusisiseko isiGaba sangoku silingana nokungathathi cala okwangoku kwisigaba esinye. Kungenxa yoko le nto i-RCCB inokukhubeka xa yomibini imisinga yahlukile kwaye imelana ukuya kuthi ga kumaza omabini ngokufanayo. Zombini iindlela ezingathathi hlangothi kunye nezesigaba zahlukile oko kuthetha ukuba ngoku kuhamba kuMhlaba.
• Okokugqibela bobabini basebenzela into enye, kodwa into edityanisiweyo ngumahluko.
• I-RCD ayifuni unxibelelwano lomhlaba ngokwawo (ibeka esweni kuphela izinto eziphilayo nezingathathi cala) .Ngaphezu koko ibona ukuhamba komhlaba ngoku nakwizixhobo ngaphandle komhlaba ongowayo.
• Oku kuthetha ukuba i-RCD iyakuqhuba inika ukhuselo lokothuka kwizixhobo ezinomhlaba onesiphene. Zizo ezi propati ezenze i-RCD yathandwa ngakumbi kuneentshaba zayo. Umzekelo, ii-breaker circuit breakers (ELCBs) zazisetyenziswa ngokubanzi kwiminyaka elishumi eyadlulayo. Ezi zixhobo zilinganise umbane kumqhubi womhlaba; ukuba lo mbane ubungekho zero oku kubonise ukuvuza okukhoyo ngoku emhlabeni. Ingxaki kukuba ii-ELCB zidinga uqhagamshelo lomhlaba ovakalayo, kunye nezixhobo ezikhuselayo. Ngenxa yoko, ukusetyenziswa kwee-ELCB akusacetyiswa.
Ukukhetha iMCB
Uphawu lokuqala kukulayisha ngaphezulu okujolise ekuthinteleni ukulayishwa okungxamisekileyo kwentambo ngaphandle kwempazamo. Isantya seMCB sokukhubeka siya kwahluka ngenqanaba lokulayisha ngaphezulu. Oku kuhlala kufezekiswa ngokusetyenziswa kwesixhobo eshushu kwi-MCB.
Uphawu lwesibini kukukhuselwa kwempazamo ngemagnethi, ekujongwe ukuba isebenze xa isiphoso sifikelele kwinqanaba elichazwe kwangaphambili kunye nokukhubekisa iMCB kwisithuba seshumi somzuzwana. Inqanaba lolu hambo lomazibuthe linika i-MCB uhlobo lwayo ngolu hlobo lulandelayo:
|
Chwetheza |
Ukurhola ngoku |
Ixesha lokuSebenza |
| Uhlobo B |
3 ukuya ku-5 ixesha elipheleleyo lomthwalo wangoku |
0.04 Ukuya kwi-13 Sec |
| Uhlobo C |
Amaxesha ama-5 ukuya kwali-10 umthwalo ogcweleyo ngoku |
0.04 Ukuya kwi-5 Sec |
| Uhlobo D |
Ukuya kumaxesha angama-20 umthwalo opheleleyo ngoku |
0.04 Ukuya kwi-3 Sec |
Uphawu lwesithathu lukhuseleko olufutshane lwesekethe, olujolise ekukhuseleni kwiziphene ezinzima mhlawumbi kumawaka ee-amps ezibangelwa ziziphene zesekethe ezimfutshane.
• Ukubanakho kwe-MCB ukusebenza phantsi kwezi meko kunika ukulinganiswa kwesekethe okufutshane kwii-Kilo amps (KA). Ngokubanzi kwiiyunithi zabathengi inqanaba lesiphoso le-6KA lanele ngelixa iibhodi zeshishini i-10KA enesiphene amandla okanye ngaphezulu kunokufuneka.
Fuse kunye neempawu zeMCB
• Iifusi kunye neeMCB zilinganiswe kwii-amps. Ukulinganiswa kwe-amp kunikwe i-fuse okanye umzimba we-MCB lixabiso langoku eliza kudlula ngokuqhubekekayo. Oku kudla ngokubizwa njengangoku kukalwe ngoku okanye ngokukhoyo ngegama.
• Abantu abaninzi bacinga ukuba xa ingaphezulu kugqithisile okwangoku, esi sixhobo siza kukhubeka, kwangoko. Ke ukuba ireyithingi ingama-30 amps, yangoku ii-30.00001 amps ziya kuyikhupha, akunjalo? Oku akuyonyaniso.
I-fuse kunye ne-MCB, nangona ii-currents nominal zazo zifana, zineempawu ezohluke kakhulu.
Umzekelo, i-32Amp MCB kunye ne-30 Amp Fuse, ukuqiniseka ukukhubeka kwimizuzwana eyi-0.1, i-MCB ifuna i-amps ezili-128, ngelixa i-fuse ifuna ii-amps ezingama-300.
• Isixhobo sefuse ngokucacileyo sifuna okungaphezulu kwangoku ukuze sikuphephethe ngelo xesha, kodwa qaphela ukuba zinkulu kangakanani zombini ezi ngingqi kunee-'30 amps 'eziphawuliweyo ngoku.
• Kukho amathuba amancinci okuba ekuhambeni, yithi, inyanga, i-amp amp 30 fuse iya kukhubeka xa uthwele ii-amps ezingama-30. Ukuba i-fuse ibinomthwalo omninzi ngaphambili (ekunokuthi kungakhange kuqatshelwe) oku kunokwenzeka kakhulu. Oku kuchaza ukuba kutheni iifyuzi ngamanye amaxesha 'zinokuvuthuza' ngaphandle kwesizathu.
• Ukuba i-fuse iphawulwe 'ngama-30 amps', kodwa iyakuma ama-40 amps ngaphezulu kweyure, singazithethelela njani ngokuyibiza ngokuba yi '30 amp 'fuse? Impendulo yeyokuba iimpawu ezigcwele kakhulu zeefyuzi ziyilelwe ukuthelekisa iipropathi zeentambo zala maxesha. Umzekelo, intambo yanamhlanje efakwe kwi-PVC iya kuma ngaphezulu kwe-50% ngaphezulu kweyure, ke oko kubonakala kufanelekile ukuba i-fuse nayo ifanele.
Ixesha Post: Dec-15-2020