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Transformer Failures, Causes & Impactiieng.org/images/proceedings_pdf/8693E0215039.pdf· PDF fileE. level oil due to leakage causes the Buchholz protection to . Breakdown of the motor in the tap changer because of over voltage or miss-use also causes the tap changer to fail to change the turn ratio of the winding. 4. Core failure . The transformers have laminated steel cores in the middle surrounded by the transformer windings.

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