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Joined: 17-February 08
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emms

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17 Feb 2008
I amusing a 112kw slip ring induction motot on a crane hoist. The motor failed and upon investigation, we found a damaged cable and the rotor had developed a short circuit between phases.

The dilemma is, we have a short circuit on the rotor, and the supply is tripping on earth fault, instead of overload as I have expected. I cant explain that!


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