描述
當(dāng)電動機的外殼接地不良，人體觸摸機殼時，會經(jīng)電動機的繞組接地點通過人身及大地與電源變壓器構(gòu)成電流回路，會造成人身觸電事故。但對電動機本身而言，由于僅有一處接地，機殼又不接地，所以不能構(gòu)成回路。因此，電動機仍然可繼續(xù)運行，然而若不及時排除此故障，如再有一處接地，就會造成匝間短路或相間短路事故了
如果電動機外殼接地，雖有一相漏電時，但接地電流可以構(gòu)成回路如虛線所示，這時對人身較為安全，但對電動機本身危險較大。因為對于接地相的繞組匝數(shù)會相應(yīng)地減少。所以，會使該相電流增加。接地點越靠近繞組的引出線端，情況越嚴重，甚至有燒壞繞組絕緣的危險。所以在電動機運行電路中必須裝設(shè)漏電保護器。
三相異步電動機對地短路可分為三相異步電動機定子對地和三相異步電動機轉(zhuǎn)子對地兩種，按修復(fù)情況又分為可修復(fù)對地和不可修復(fù)對地(死對地)。
產(chǎn)品承諾
保?證?全新原裝進口,
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