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Standard

IEEE C57.91-1981

Revised

Note: Latest version: IEEE C57.91-2011

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Abstract

New IEEE Standard - Superseded. General recommendations for loading 65 degrees Centigrade-rise mineral-oil-immersed overhead and pad-mounted distribution transformers are covered. Recommendations for 55 degrees Centigrade-rise transformers are included because a substantial percentage of these transformers are still in service. The recommendations are based on winding hottest-spot calculations only. Other factors that may limit the permissible load to lower values are listed. A method to establish winding temperature and loss of life by nomographs is given.

Products specifications

  • Standard from IEEE
  • Published:
  • Document type: IS
  • Pages
  • Publisher: IEEE
  • Distributor: IEEE
  • ICS: 29.180
  • National Committee: IEEE Power and Energy Society / Transformers

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