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Revision Standard - Active. This guide provides recommendations for loading mineral-oil-immersed transformers and step-voltage regulators with insulation systems rated for a 65 C average winding temperature rise at rated load. This guide applies to transformers manufactured in accordance with IEEE Std C57.12.001 and tested in accordance with IEEE Std C57.12.90, and step-voltage regulators manufactured and tested in accordance with IEEE Std C57.15. Because a substantial population of transformers and step-voltage regulators with insulation systems rated for 55 C average winding temperature rise at rated load are still in service, recommendations that are specific to this equipment are also included.
 

Document History

  1. IEEE C57.91-2011

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    IEEE Guide for Loading Mineral-Oil-Immersed Transformers and Step-Voltage Regulators

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  2. IEEE C57.91-1995


    IEEE Guide for Loading Mineral-Oil-Immersed Transformers

    • Historical Version
  3. IEEE 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

    • Historical Version