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IEEE C57.12.01-2020
IEEE Standard for General Requirements for Dry-Type Distribution and Power Transformers
Revision Standard - Active. Electrical, mechanical, and safety requirements of ventilated, non-ventilated, and sealed dry-type distribution and power transformers or autotransformers (single and polyphase, with a voltage of 601 V or higher in the highest voltage winding) are described in this standard.
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Institute of Electrical and Electronics Engineers [ieee]