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IEEE STANDARD

C57.91-1981 - IEEE Guide for Loading Mineral-Oil-Immersed Overhead and Pad-Mounted Distribution Transformers Rated 500kVA and Less with 65 C or 55 C Average Winding Rise

Description: This guide covers general recommendations for loading 65 degrees C rise mineral-oil-immersed overhead and pad-mounted distribution transformers described in American National Standards and rated 500 kVA and less. Recommendations for 55 degrees C rise transformers are included in this guide because a substantial percentage of these transformers are still in service.
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