PC57.12.52 - Standard for Sealed Dry-Type Distribution and Power Transformers
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This standard describes electrical and mechanical requirements of single and polyphase sealed dry-type distribution and power transformers or autotransformers, with a voltage of 601 V or higher in the highest voltage winding. This standard applies to all sealed dry-type transformers, including those with solid cast and/or resin-encapsulated windings except as follows: a) Transformers described as exceptions in IEEE Std C57.12.01 b) Ventilated transformers c) Nonventilated transformers d) Pad-mounted transformers e) Liquid-immersed transformers
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