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1054550600
海納百川
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樓主  發(fā)表于: 2012-05-05 12:22
現有1根300平方的電纜線(xiàn)；所帶的負荷800A左右；電纜線(xiàn)受不了；請問(wèn)能不能并1根不同規格的150平方的電纜線(xiàn)；
真誠到永遠
cxlxt
級別: 略有小成
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1樓  發(fā)表于: 2012-05-05 21:59
應該是可以的，在長(cháng)度相等的情況下，300平方電纜線(xiàn)每一根芯線(xiàn)的電阻是150平方電纜線(xiàn)每一根芯線(xiàn)的電阻的一半，那么，并聯(lián)后，電壓相等，通過(guò)300平方電纜線(xiàn)每一根芯線(xiàn)的電流大約是通過(guò)150平方電纜線(xiàn)每一根芯線(xiàn)的電流的兩倍，如果，原先是800安，并聯(lián)一根長(cháng)度相等的150平方電纜后，300電纜的電流約為800*2/3=1600/3=533.3安，150電纜的電流約為800/3=266.7安

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