Pakupanga magetsi ndi kusintha kwaukadaulo, ogwira ntchito zamagetsi nthawi zambiri samadziwa momwe angasankhire mwasayansi gawo la zingwe.Amagetsi odziwa bwino adzawerengera panopa potengera katundu wamagetsi ndikusankha malo ozungulira chingwe chophweka kwambiri;Mgwirizanowu umasankha chingwe chodutsa pachigawo chotsatira njira yamagetsi;Ndinganene kuti zimene akumana nazo n’zothandiza koma osati zasayansi.Pali zolemba zambiri pa intaneti, koma nthawi zambiri zimakhala zosakwanira komanso zovuta kuzimvetsetsa.Lero ndikugawana nanu njira yasayansi komanso yosavuta yosankha chingwe chodutsa magawo.Pali njira zinayi za zochitika zosiyanasiyana.
Sankhani molingana ndi kuchuluka kololedwa kwa nthawi yayitali:
Kuti zitsimikizire chitetezo ndi moyo wautumiki wa chingwe, kutentha kwa chingwe pambuyo poyatsa sikuyenera kupitilira kutentha kovomerezeka kwanthawi yayitali, komwe ndi madigiri 70 a zingwe zotsekereza za PVC ndi madigiri 90 a polyethylene yolumikizidwa. zingwe zotsekera.Malinga ndi mfundo iyi , ndizosavuta kusankha chingwe poyang'ana patebulo.
Perekani zitsanzo:
Mphamvu ya thiransifoma ya fakitale ndi 2500KVa ndipo mphamvu ndi 10KV.Ngati zingwe zomangika za polyethylene zomangika zimagwiritsidwa ntchito kuziyika mu mlatho, ndiye kuti zingwezo ziyenera kukhala zotani?
Khwerero 1: Werengani ma 2500/10.5/1.732=137A
Khwerero 2: Onani buku losankhira chingwe kuti mudziwe,
YJV-8.7/10KV-3X25 kunyamula mphamvu ndi 120A
YJV-8.7/10KV-3X35 yonyamula mphamvu ndi 140A
Khwerero 3: Sankhani chingwe cha YJV-8.7/10KV-3X35 chokhala ndi mphamvu yonyamulira kuposa 137A, yomwe imatha kukwaniritsa zofunikira.Zindikirani: Njirayi sichiganizira zofunikira za kukhazikika kwamphamvu ndi kutentha kwa kutentha.
Sankhani malinga ndi kachulukidwe kachuma:
Kungomvetsetsa kachulukidwe kachuma kameneka, gawo laling'ono la chingwe limakhudza ndalama za mzere ndi kutayika kwa mphamvu yamagetsi.Pofuna kupulumutsa ndalama, tikuyembekeza kuti malo odutsa chingwe ndi ochepa;pofuna kuchepetsa kutayika kwa mphamvu yamagetsi, tikuyembekeza kuti malo ozungulira chingwe ndi aakulu.Malingana ndi zomwe zili pamwambazi, dziwani zomveka Malo amtundu wa chingwe amatchedwa dera lachuma, ndipo kachulukidwe kameneka kameneka kamatchedwa chuma chamakono.
Njira: Malinga ndi maola ogwiritsira ntchito pachaka a zida, yang'anani patebulo kuti mupeze kuchuluka kwachuma komwe kulipo.Gawo: A/mm2
Mwachitsanzo: Zomwe zidavotera zida ndi 150A, ndipo nthawi yogwira ntchito pachaka ndi maola 8,000.Kodi mbali yopingasa ya chingwe cha copper core ndi chiyani?
Malinga ndi tebulo pamwambapa C-1, zitha kuwoneka kuti kwa maola 8000, kachulukidwe kachuma ndi 1.75A/mm2.
S=150/1.75=85.7A
Kutsiliza: Chingwe chodutsa gawo lomwe titha kusankha malinga ndi mawonekedwe a chingwe ndi 95mm2
Sankhani molingana ndi kutentha kwapakati:
Tikamagwiritsa ntchito njira yoyamba ndi yachiwiri kuti tisankhe malo ozungulira chingwe, ngati chingwecho chiri chotalika kwambiri, padzakhala kutsika kwa magetsi panthawi ya ntchito ndi kuyambitsa.Mphamvu yamagetsi kumbali ya zida ndi yocheperapo kusiyana ndi mtundu wina, zomwe zimapangitsa kuti zida ziwotche.Malingana ndi zofunikira za "Buku la Electrician's Manual", kutsika kwa voteji kwa mzere wa 400V sikungakhale pansi pa 7%, ndiko kuti, 380VX7% = 26.6V.Njira yowerengera madontho amagetsi (madontho amagetsi amphamvu okhawo amangoganiziridwa apa):
U=I×ρ×L/SS=I×ρ×L/U
U voltage drop I ndiye chida chovotera chamakono ρ conductor resistivity S ndi chingwe chodutsa gawo L ndiye kutalika kwa chingwe
Chitsanzo: The oveteredwa panopa zida 380V ndi 150A, ntchito mkuwa pachimake chingwe (ρ wa mkuwa = 0.0175Ω.mm2/m), dontho voteji chofunika kukhala zosakwana 7% (U=26.6V), chingwe kutalika ndi Mamita 600, chingwe chodutsa gawo S ndi chiyani??
Malinga ndi chilinganizo S=I×ρ×L/U=150×0.0175×600/26.6=59.2mm2
Kutsiliza: Chingwe chodutsa magawo amasankhidwa ngati 70mm2.
Sankhani molingana ndi kutentha kwapakati:
1. Pamene zingwe za 0.4KV zimatetezedwa ndi kusintha kwa mpweya, zingwe zambiri zimatha kukwaniritsa zofunikira za kutentha kwa kutentha ndipo palibe chifukwa choyang'ana molingana ndi njirayi.
2. Kwa zingwe pamwamba pa 6KV, mutasankha chingwe chodutsa gawolo pogwiritsa ntchito njira yomwe ili pamwambayi, muyenera kufufuza ngati ikukwaniritsa zofunikira za kutentha kwa kutentha motsatira ndondomekoyi.Ngati sichoncho, muyenera kusankha malo okulirapo.
Fomula: Smin=Id×√Ti/C
Pakati pawo, Ti ndi nthawi yosweka ya wowononga dera, yomwe imatengedwa ngati 0.25S, C ndi chingwe chokhazikika chokhazikika, chomwe chimatengedwa ngati 80, ndipo Id ndiye gawo lachitatu lachidule la dongosolo.
Chitsanzo: Momwe mungasankhire gawo laling'ono la chingwe pamene dongosolo lachidule la 18KA.
Smin=18000×√0.25/80=112.5mm2
Kutsiliza: Ngati dongosolo lalifupi-wazungulira panopa kufika 18KA, ngakhale oveteredwa panopa zipangizo ndi yaing'ono, chingwe mtanda gawo dera sayenera kukhala zosakwana 120mm2.
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Nthawi yotumiza: Sep-13-2023
