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Standard

IEEE C57.91-2011

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Abstract

Revision Standard - Inactive-Reserved. 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.

Products specifications

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  • Withdrawn: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

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