A cikin ƙirar lantarki da sauye-sauyen fasaha, ma'aikatan lantarki sau da yawa ba su san yadda ake zabar yanki na igiyoyi a kimiyyance ba.Kwararrun masu aikin lantarki za su lissafta halin yanzu dangane da nauyin wutar lantarki kuma su zaɓi yanki na kebul na kebul a sauƙaƙe;Ƙungiya ta zaɓi sashin giciye na kebul bisa tsarin injin lantarki;Zan ce kwarewarsu a aikace ce amma ba kimiyya ba.Akwai rubuce-rubuce da yawa akan Intanet, amma galibi ba su cika cika ba kuma suna da wahalar fahimta.A yau zan raba tare da ku hanyar kimiyya da sauƙi don zaɓar yanki na yanki na kebul.Akwai hanyoyi guda hudu don lokuta daban-daban.
Zaɓi gwargwadon ƙarfin ɗaukar nauyi na dogon lokaci:
Don tabbatar da aminci da rayuwar sabis na kebul, zazzabi na kebul bayan kunna wutar lantarki bai kamata ya wuce ƙayyadadden yanayin aiki na dogon lokaci ba, wanda shine digiri 70 don igiyoyin da aka keɓe na PVC da digiri 90 don polyethylene mai haɗin giciye. igiyoyi masu rufi.Bisa ga wannan ka'ida , yana da sauƙi don zaɓar kebul ta hanyar kallon tebur.
Ba da misalai:
The transformer iya aiki na wani factory ne 2500KVa da kuma samar da wutar lantarki ne 10KV.Idan an yi amfani da igiyoyi masu ɓoye polyethylene masu haɗin giciye don shimfiɗa su a cikin gada, menene ya kamata ya zama yanki na igiyoyi?
Mataki 1: Lissafin ƙididdiga na yanzu 2500/10.5/1.732=137A
Mataki na 2: Duba littafin zaɓi na USB don ganowa,
YJV-8.7/10KV-3X25 iya aiki ne 120A
YJV-8.7/10KV-3X35 iya aiki ne 140A
Mataki 3: Zaɓi YJV-8.7 / 10KV-3X35 na USB tare da ƙarfin ɗaukar nauyi fiye da 137A, wanda zai iya cika buƙatun.Lura: Wannan hanyar ba ta la'akari da buƙatun don kwanciyar hankali mai ƙarfi da kwanciyar hankali na thermal.
Zaɓi bisa ga girman halin yanzu na tattalin arziki:
Don kawai fahimtar girman halin yanzu na tattalin arziki, yanki na kebul na kebul yana rinjayar saka hannun jari na layi da asarar makamashin lantarki.Domin a ceci zuba jari, ana fatan cewa yankin kebul na kebul ya fi karami;domin rage asarar makamashin lantarki, ana fatan yankin kebul na kebul ya fi girma.Bisa la'akari da abubuwan da ke sama, ƙayyade madaidaicin yanki na kebul na kebul ana kiransa yanki na yanki na tattalin arziki, kuma madaidaicin halin yanzu ana kiransa girman halin yanzu na tattalin arziki.
Hanyar: Dangane da sa'o'in aiki na shekara-shekara na kayan aiki, duba tebur don samun ƙimar tattalin arziƙin yanzu.Naúrar: A/mm2
Misali: Ƙididdigar halin yanzu na kayan aiki shine 150A, kuma lokacin aiki na shekara shine sa'o'i 8,000.Menene yankin giciye na babban kebul na jan ƙarfe?
Bisa ga tebur na sama C-1, ana iya ganin cewa don 8000 hours, yawan tattalin arziki shine 1.75A / mm2.
S=150/1.75=85.7A
Kammalawa: Yankin giciye na kebul ɗin da za mu iya zaɓar bisa ga ƙayyadaddun kebul ɗin shine 95mm2
Zaɓi bisa ga ƙimar kwanciyar hankali na thermal:
Lokacin da muka yi amfani da hanyoyi na farko da na biyu don zaɓar yanki na haɗin kebul, idan kebul ɗin yana da tsayi sosai, za a sami raguwar ƙarfin lantarki yayin aiki da farawa.Wutar lantarki a gefen kayan aiki yana ƙasa da wani yanki, wanda zai sa kayan aiki suyi zafi.Dangane da buƙatun littafin “Manual na lantarki”, raguwar ƙarfin lantarki na layin 400V ba zai iya zama ƙasa da 7% ba, wato 380VX7%=26.6V.Ƙididdigar ƙididdige ƙimar ƙarfin lantarki (kawai ana la'akari da faɗuwar irin ƙarfin lantarki a nan):
U=I×ρ×L/SS=I×ρ×L/U
U juzu'in wutar lantarki I shine ƙimar halin yanzu na kayan aiki ρ conductor resistivity S shine yankin giciye na kebul L shine tsayin kebul
Misali: Ƙididdigar halin yanzu na kayan aiki na 380V shine 150A, ta amfani da kebul na jan ƙarfe (ρ na jan karfe = 0.0175Ω.mm2/m), ana buƙatar raguwar ƙarfin lantarki ya zama ƙasa da 7% (U=26.6V), tsayin kebul shine Mita 600, menene yankin giciye na kebul na S??
Bisa ga dabara S=I × ρ×L/U=150×0.0175×600/26.6=59.2mm2
Kammalawa: An zaɓi yanki na giciye na kebul azaman 70mm2.
Zaɓi bisa ga ƙimar kwanciyar hankali na thermal:
1. Lokacin da kebul na 0.4KV ke kiyaye shi ta hanyar sauyawar iska, manyan igiyoyi na iya saduwa da bukatun kwanciyar hankali na thermal kuma babu buƙatar dubawa bisa ga wannan hanya.
2. Don igiyoyi sama da 6KV, bayan zaɓar yankin giciye na kebul ta amfani da hanyar da ke sama, dole ne ka bincika ko ya dace da buƙatun kwanciyar hankali na thermal bisa ga dabara mai zuwa.Idan ba haka ba, kuna buƙatar zaɓar yanki mafi girma na yanki.
Formula: Smin=Id×√Ti/C
Daga cikin su, Ti shine lokacin karyewar na'urar kewayawa, wanda aka ɗauka azaman 0.25S, C shine ƙimar kwanciyar hankali na thermal na USB, wanda aka ɗauka azaman 80, kuma Id shine ƙimar gajeriyar kewayawa na zamani mai matakai uku.
Misali: Yadda ake zabar yankin giciye na kebul lokacin da tsarin gajeriyar kewayawa shine 18KA.
Smin=18000×√0.25/80=112.5mm2
Kammalawa: Idan tsarin gajeren lokaci na yanzu ya kai 18KA, ko da ma'aunin kayan aiki yana da ƙananan, yanki na giciye na USB bai kamata ya zama ƙasa da 120mm2 ba.
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Lokacin aikawa: Satumba-13-2023
