Umgomo wokukhetha wesixhumi se-AC

I-contactor isetshenziswa njengedivaysi yokuvula nokuvala amandla okulayisha. Ukukhethwa koxhumana naye kufanele kuhlangabezane nezidingo zemishini elawulwayo. Ngaphandle kokuthi i-voltage yokusebenza elinganiselwe iyafana ne-voltage elinganiselwe yokusebenza yempahla elawulwayo, amandla okulayisha, isigaba sokusebenzisa, Imodi yokulawula, imvamisa yokusebenza, impilo yokusebenza, indlela yokufaka, usayizi wokufaka nomnotho kuyisisekelo sokukhetha. Izimiso zokukhetha zimi kanje:
(1) Izinga le-voltage yesixhumi se-AC kufanele lifane nalelo lomthwalo, futhi uhlobo lwe-contactor kufanele lufanele umthwalo.
(2) I-current ebaliwe yomthwalo kufanele ihambisane nezinga lomthamo we-contactor, okungukuthi, i-current counted ingaphansi noma ilingana nesilinganiso sokusebenza samanje se-contactor. I-switching current ye-contactor inkulu kuneyokuqala yamanje yomthwalo, futhi i-breaking current inkulu kune-breaking current lapho umthwalo usebenza. Isibalo samanje somthwalo kufanele sicabangele indawo yokusebenza yangempela kanye nezimo zokusebenza. Ngomthwalo onesikhathi eside sokuqala, amandla aphakeme wesigamu sehora awakwazi ukudlula amandla okukhiqiza ukushisa okuvunyelwene ngawo.
(3) Linganisa ngokuya ngokuzinza kwesikhashana okuguquguqukayo nokushisayo. I-current short-circuit yesigaba sesithathu yomugqa akufanele idlule i-dynamic and thermal current stable evunyelwe yi-contactor. Uma usebenzisa i-contactor ukuphula i-short-circuit current, umthamo wokuphuka we-contactor kufanele futhi uhlolwe.
(4) I-voltage elinganiselwe kanye ne-current yekhoyili ehehayo yesixhumi kanye nenombolo namandla amanje othintana nabo abasizayo kuzohlangabezana nezidingo zezintambo zesekethe yokulawula. Ukuze ucabangele ubude bomugqa oxhunywe kumjikelezo wokulawula othintana naye, inani le-voltage yokusebenza elituswa ngokuvamile, othintana naye kufanele akwazi ukusebenza ku-85 kuya ku-110% we-voltage elinganiselwe. Uma ulayini umude kakhulu, ikhoyili ye-contactor ingase ingaphenduli emyalweni wokuvala ngenxa yokwehla kwe-voltage enkulu; ngenxa yomthamo omkhulu wolayini, ungase ungasebenzi kumyalo wokukhubeka.
(5) Hlola imvamisa evumelekile yokusebenza kothintana naye ngokwenani lemisebenzi. Uma imvamisa yokusebenza idlula inani elishiwo, isilinganiso samanje kufanele siphindwe kabili.
(6) Imingcele yezingxenye zokuvikela isifunda esifushane kufanele ikhethwe ngokuhambisana nemingcele ye-contactor. Ukuze ukhethe, sicela ubheke imanuwali yekhathalogi, ngokuvamile ehlinzeka ngethebula elihambisanayo labathintana nabo kanye namafuse.
Ukubambisana phakathi kwe-contactor kanye ne-air circuit breaker kufanele kunqunywe ngokuvumelana ne-coefficient yokulayisha ngokweqile kanye ne-coefficient yamanje yokuvikela isifunda esifushane se-air circuit breaker. Ukushisa okuvunyelwene ngakho kwe-contactor kufanele kube ngaphansi kokulayisha ngokweqile kwe-air circuit breaker, futhi i-air on and off current ye-contactor kufanele ibe ngaphansi kokuvikelwa kwesekethe emfushane yamanje ye-circuit breaker, ukuze i-circuit breaker ikwazi ukuvikela. othintana naye. Empeleni, othintana naye uyavuma ukuthi isilinganiso sokushisisa samanje nesilinganiso sokusebenza samanje siphakathi kuka-1 no-1.38 ezingeni le-voltage, kuyilapho i-circuit breaker inemingcele eminingi ye-overload overload coefficient yesikhathi, ehlukile ezinhlotsheni ezahlukene zama-circuit breaker, ngakho-ke Kunzima ukubambisana phakathi kwalokhu okubili Kunendinganiso, engakwazi ukwakha ithebula lokufanisa, futhi idinga ukubalwa kwezimali kwangempela.
(7) Ibanga lokufakwa kwezixhumi nezinye izingxenye kufanele lihambisane namazinga afanele kazwelonke kanye nokucaciswa, futhi ukugcinwa nokugcinwa nobude bezintambo kufanele kubhekwe.
3. Ukukhethwa koxhumana nabo be-AC ngaphansi kwemithwalo ehlukene
Ukuze ugweme ukunamathela kokuxhumana kanye nokukhishwa kwe-contactor futhi andise impilo yesevisi ye-contactor, othintana naye kufanele agweme ubuningi bamanje bomthwalo oqalayo, futhi acabangele izici ezingathandeki njengobude besikhathi sokuqala, ngakho-ke kuyadingeka. ukulawula umthwalo we-contactor uvula futhi uvale. Ngokwezici zikagesi zomthwalo kanye nesimo sangempela sesistimu yamandla, i-current-stop stop yemithwalo ehlukene ibalwa futhi ilungiswe.