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redrock99
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樓主  發(fā)表于: 2014-10-13 12:50
圖片：
星三角啟動(dòng)電機的熱繼電器FR1和FR2在圖中2個(gè)位置，其保護整定值應該設多少？

應該是額定電機額定電流Ir的√3 /2還是√3 /3 ？

個(gè)人感覺(jué)應該都是√3 /2，即0.87倍的Ir。


應該是√3 /3？
[ 此帖被redrock99在2014-10-13 13:37重新編輯 ]
wu32u2
耐得住挫折的打磨，我們將迸發(fā)出比鉆石還璀璨的光芒——
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1樓  發(fā)表于: 2014-11-05 08:40
作為電機過(guò)載保護的電氣元件，其整定值肯定要比額定值要大，不然豈不是經(jīng)常保護性跳開(kāi)了？
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