Ulwahlulo oluphambili kunye neempawu zemveliso yee-low-voltage circuit breakers (izitshixo zomoya)

Ukuhlelwa okuphambili kunye neempawu zemveliso ye-low-voltage abaphuli beesekethe (izitshixo zomoya)

Indlela ephambili yokuhlela i-low-voltage circuit breakers, ngokusekelwe kwifom yabo yesakhiwo, ivulekile kunye nohlobo lwezixhobo, olululuhlu lwemveliso oluqhelekileyo. I-Open ikwabizwa ngokuba luhlobo lwesakhelo okanye uhlobo lwendalo yonke, ngelixa uhlobo lwesixhobo lubizwa ngokuba luhlobo lweqokobhe leplastiki.

Umgaqo-nkqubo wokukhetha ngokubanzi wabaphuli beesekethe.

I-voltage elinganisiweyo yokusebenza ye-breaker circuit kufuneka ibe nkulu okanye ilingane ne-voltage elinganisiweyo yomgca.Umbane olinganisiweyo we-breaker circuit kufuneka ube mkhulu okanye ulingane nomthwalo wangoku womgca womgca.Umthamo we-short-circuit breaking capacity of the circuit breaker kufuneka ube mkhulu okanye ulingane nobuninzi be-short-circuit current enokuthi yenzeke kumgca (ubalwe njengexabiso elisebenzayo) Amaxesha angama-1.25 isethi yangoku yokukhululwa ngokukhawuleza kwe-breaker circuit.I-voltage elinganisiweyo yokukhululwa kwe-undervoltage ye-breaker circuit kufuneka ilingane nomthamo olinganisiweyo womgca.I-voltage elinganisiweyo yokukhutshwa kwe-shunt ye-breaker circuit kufuneka ilingane nolawulo lombane wombane. Eminye imizekelo yabaphuli beesekethe ivumela kuphela umgca ukuba ungene ukusuka phezulu, ngelixa ezinye iimodeli zivumela ukuba umgca ungene ukusuka phezulu okanye phantsi.

Imigaqo yokukhetha i-low-voltage circuit breakers

1.Ukumisela uhlobo kunye nefom yokukhusela i-circuit breaker ngokweemfuno zokukhusela zomgca: khetha uhlobo lwesakhelo, uhlobo lwesixhobo okanye uhlobo lwangoku lokukhawulela, njl.
Isixhobo sohlobo lwe-circuit breaker: Ine-shell yeplastiki ekhuselayo, inkqubo yoqhagamshelwano eyakhelwe-ngaphakathi, igumbi lokucima i-arc kunye nokukhululwa, njl., kwaye inokuvalwa ngesandla okanye ngombane (kwi-breaker circuit-capacity). Inomthamo owomeleleyo wokuqhekeka, uzinzo oluphezulu oluguqukayo, kunye nemisebenzi yokhuselo ekhethiweyo egqibeleleyo. Isetyenziswa ngokubanzi kwimigca yokuhambisa. Okwangoku, iimveliso ezisetyenziswa ngokuqhelekileyo ziquka i-DZ15, i-DZ20, i-DZX19, i-C45N (ngoku iphuculwe ukuya kwi-C65N) kunye nolunye uchungechunge. Phakathi kwabo, i-C45N (C65N) i-circuit breakers ineenzuzo zobukhulu obuncinci, amandla okuphula amandla, ukusebenza kakuhle kokunciphisa okwangoku, ukusebenza okulula, kunye neemodeli ezipheleleyo kunye neenkcukacha. Zinokudityaniswa ngokulula zibe ziipali ezimbini, iipali ezintathu kunye neepali ezine zesekethe ezisekelwe kwisakhiwo se-pole-pole, kwaye zisetyenziswa ngokubanzi kumasebe okukhanya oluntu kunye nemigca yesebe ye-60A nangaphantsi (isetyenziswa kakhulu ukutshintshwa komgca ongenayo kubasebenzisi beendawo zokuhlala kunye nokukhanyisa ukutshintshwa kwesebe kwiindawo zokuthenga).
I-2.I-Frame-type low-voltage circuit breakers: umthamo omkhulu, amandla okuqhawula i-short-circuit, ukuzinza okuphezulu okuguquguqukayo, okufanelekileyo kwi-AC 50Hz, i-voltage elinganisiweyo ye-380V yokusabalalisa inethiwekhi, njengokhuseleko oluphambili lwemigca ye-trunk yokusabalalisa. I-Frame-type-circuit breakers iqulunqwe ikakhulu yinkqubo yoqhagamshelwano, indlela yokusebenza, ukukhululwa kwe-overcurrent, ukukhululwa kwe-shunt, ukukhutshwa kwe-undervoltage, izixhobo kunye nesakhelo, njl. Okwangoku, i-frame-type ye-low-voltage circuit breakers esetyenziswa ngokuqhelekileyo kwilizwe lam yi-DW15, ME, AE, AH kunye nolunye uchungechunge. I-DW15 series breakers circuit iphuhliswa kwaye iveliswa kwilizwe lam. Uluhlu olupheleleyo lubandakanya iimodeli ezininzi ezifana ne-1000, i-1500, i-2500, kunye ne-4000A. I-ME, i-AE, kunye ne-AH yochungechunge lwee-breakers zesekethe ziveliswa kusetyenziswa iteknoloji evela kumazwe angaphandle, kunye neenkcukacha ezipheleleyo kunye neemodeli (nditshintsha amanqanaba akhoyo ngoku ukusuka kwi-630A ukuya kwi-5000A, i-13 iyonke amanqanaba), kwaye umthamo wokuqhawula ulinganisiwe unamandla kunoko DW15. Zihlala zisetyenziselwa ukhuseleko oluphambili lwee-voltage low distribution trunks.
3.Abaphuli beesekethe abakrelekrele: Okwangoku, kukho iindidi ezimbini zezaphuli-mthetho ezikrelekrele eziveliswe kwilizwe lam: uhlobo lwesakhelo kunye nohlobo lweqokobhe leplastiki. Uhlobo lwesakhelo abaphuli beesekethe ezikrelekrele zisetyenziswa ikakhulu njengezaphuli zesekethe eziphambili kwiinkqubo zokusasaza ezizenzekelayo ezikrelekrele, ngelixa iqokobhe leplastiki uhlobo lwezaphuli zesekethe ezikrelekrele zisetyenziselwa ukuhanjiswa kwamandla kuthungelwano lokuhambisa kunye nolawulo kunye nokukhuselwa kwemigca kunye nezixhobo zokubonelela ngombane. Isetyenziswa njengolawulo lwenqanaba lesithathu leenjini ze-asynchronous motors. Iimpawu zezaphuli zesekethe ezikrelekrele kukuba zisebenzisa abalawuli abakrelekrele (izixhobo zohambo olukrelekrele) ezinemicroprocessors okanye i-single-chip microcomputers njengendawo engundoqo, kwaye banemisebenzi yokubeka iliso kwi-intanethi, uhlengahlengiso oluzenzekelayo, umlinganiselo, uvavanyo, ukuzixilonga, unxibelelwano, njl. iiparameters xa isiphaluka sokhuseleko sisebenza, kwaye sigcine ezi parameters kwimemori engaguqukiyo yombuzo. Iimodeli eziqhelekileyo zasekhaya ezikrelekrele zokuqhawula isiphaluka ziquka i-DW45, i-DW40, i-DW914 (AH), i-DW18 (i-AE-S), i-DW48, i-DW19 (3WE), i-DW17 (ME), njl.

Xa ukhetha i-breaker circuit, le migaqo ilandelayo kufuneka ithathelwe ingqalelo:

1. I-voltage elinganisiweyo (i-UN) ye-breaker yesekethe kufuneka ilingane okanye ibe mkhulu kunombane olinganisiweyo womgca okhuselweyo.
2. Umbane olinganisiweyo wokukhutshwa kwe-undervoltage ye-breaker circuit kufuneka ihambelane nombane olinganisiweyo womgca okhuselweyo.
3. Umlinganiselo olinganisiweyo we-circuit breaker kunye nokukhululwa kwayo ngokugqithisileyo kufuneka ibe mkhulu okanye ilingane nombane obalwayo wesekethe ekhuselweyo.
4. Umthamo wokugqibela wokuqhawula we-circuit breaker kufuneka udlule ixabiso elisebenzayo lobuninzi be-short-circuit current kumgca.
5. Iimpawu zokukhusela ezinqamlekileyo eziphezulu kunye nezisezantsi kumgca wokusabalalisa kufuneka zilungelelaniswe, kunye neempawu zokukhusela ezisezantsi ezibekwe ngezantsi kwaye zingaphambanisi kunye neempawu zokukhusela eziphezulu.
6. Ukulibaziseka kwexesha elide lokukhubeka okwangoku kwe-breaker circuit kufuneka kube ngaphantsi kwe-current evumelekileyo eqhubekayo yocingo.

Kwizaphuli zesekethe zokuhambisa amandla, le migaqo yokukhetha ilandelayo iyasebenza:

1. Ixabiso lokumisela ixesha elide lokusebenza kwe-circuit breaker akufanele lidlule umthamo ovumelekileyo wokuthwala ucingo. Ukusetyenziswa kweengcingo kunye nentambo, kuyacetyiswa ukuba usebenzise i-80% yocingo kunye nekhebula elivumelekileyo lokuthwala umthamo wangoku.
2. Ixesha elibuyiswayo lokulibaziseka kwexesha elide lokulibaziseka kokusebenza kwexabiso langoku kufuneka libe likhulu okanye lilingane nexesha lokuqala lemoto kunye neyona nto iphambili yokuqala kumgca.
3. Ixabiso lokumisela langoku elikhawulezayo kufuneka libe ubuncinane amaxesha angama-1.1 isixa somthamo wokubala umgca wangoku (Ijx) kunye nemveliso ye-motor eqalayo i-coefficient yempembelelo yangoku (k1, ngokuqhelekileyo i-1.7-2), i-motor eqala ngoku i-multiple (k), kunye ne-current rated current ye-motor enkulu (Icdm).

Kwizaphuli zesekethe zokhuseleko lweemoto, le migaqo yokukhetha ilandelayo iyasebenza:

1. Ixesha elide lokulibaziseka ixabiso langoku lokumisela kufuneka lilingane ne-motor yangoku.
2. Ukusetwa okukhawulezileyo kwangoku kwi-breakers ekhusela ii-motor cage kufuneka kube ngamaxesha angama-8-15 i-motor rated current, ngelixa i-motor rotor motors, kufuneka ibe ngamaxesha angama-3-6 i-motor rated current.
3. Ixesha elibuyiswayo kumaxesha amathandathu okulibaziseka okude kwangoku ixabiso lokumisela ixabiso kufuneka libe likhulu okanye lilingane nelona xesha lokuqalisa lemoto, ngokhetho lwe-1S, 3S, 5S, 8S, 12S, okanye 15S ngokusekelwe kubunzima bomthwalo ekuqaleni.

Xa unxibelelanisa abaphuli beesekethe kunye neefusi, le migaqo ilandelayo kufuneka iqwalaselwe:

1. Ukuba umsinga olindelekileyo wesekethe emfutshane kwindawo yofakelo ungaphantsi komthamo olinganiselweyo we-breaker circuit, i-fuse ingasetyenziswa njengokhuseleko lokugcinwa kwe-backup ngenxa yomlinganiselo oqinileyo wokukwazi ukwaphuka kwesekethe emfutshane. Njengoko kubonisiwe kwi-Figure 1, i-figuse ye-backup i-fuse (1) idibanisa kunye nempawu ye-circuit breaker (2). Xa kwenzeka umgca we-short-circuit, ixesha lokuqhawula i-fuse lifutshane kune-circuit breaker's, eqinisekisa ukhuseleko lwe-circuit breaker. Indawo yokudlulisa kwiimpawu inokukhethwa kwi-80% ye-circuit breaker i-short-circuit breaking capacity.
2. I-fuse kufuneka ifakwe kwicala lamandla le-breaker circuit ukuqinisekisa ukusetyenziswa okukhuselekileyo.