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三相非同步電動機啟動按銘牌標示接法為△形或Y形時,均為全壓啟動,若銘牌標示接法為△形而採用Y形接法啟動,則為降壓啟動,啟動電流為原接法時的1/3;若銘牌標示接法為Y形而採用△形接法時,則不適合負載三相380V電壓,只適合負載三相220V電壓運行.
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