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  1. helpdex

    Excessive Heat Primary Delt-Wye, WHY?

    We have burned up two 330kva Isolation Delt-Wye 480v transformers. Both transformers had the same primary winding burn up and all other windings were fine. We notice that the xformers would get really hot and then at time run normal temps, the heat was only on the phase a transformer and only...

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