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qinchenglim
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樓主  發(fā)表于: 2017-12-06 10:33
圖片：
2個(gè)電流互感器1個(gè)熱繼如圖所示接線(xiàn)，互感器400/5，熱繼該選多大的才能正常保護電機？
電機132KW  AC380V 先謝謝各位大神
老兔子
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1樓  發(fā)表于: 2017-12-06 20:11
首先要知道你的電動(dòng)機額定電流到底是多少（要查銘牌），然后根據400/5來(lái)計算在額定電流時(shí)互感器二次側的電流是多少（不會(huì )大于5A），再乘以1.2~2.5就是熱繼電器的整定電流了。

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