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IEEE C57.91-2011

Current Revision

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

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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.
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.
Applications of loads in excess of nameplate rating involve some degree of risk. It is the purpose of this guide to identify these risks and to establish limitations and guidelines, the application of which will minimize the risks to an acceptable level.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number C57.91
Publication Date March 7, 2012
Language en - English
Page Count 123
Revision Level
Supercedes
Committee Transformers
Publish Date Document Id Type View
March 7, 2012 C57.91-2011 Revision
Nov. 30, 1995 C57.91-1995 Revision
July 31, 1981 C57.91-1981 Revision