描述
当电动机的外壳接地不良，人体触摸机壳时，会经电动机的绕组接地点通过人身及大地与电源变压器构成电流回路，会造成人身触电事故。但对电动机本身而言，由于仅有一处接地，机壳又不接地，所以不能构成回路。因此，电动机仍然可继续运行，然而若不及时排除此故障，如再有一处接地，就会造成匝间短路或相间短路事故了
如果电动机外壳接地，虽有一相漏电时，但接地电流可以构成回路如虚线所示，这时对人身较为安全，但对电动机本身危险较大。因为对于接地相的绕组匝数会相应地减少。所以，会使该相电流增加。接地点越靠近绕组的引出线端，情况越严重，甚至有烧坏绕组绝缘的危险。所以在电动机运行电路中必须装设漏电保护器。
三相异步电动机对地短路可分为三相异步电动机定子对地和三相异步电动机转子对地两种，按修复情况又分为可修复对地和不可修复对地(死对地)。
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