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IEEE C57.91-1995

Historical Revision

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

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Revision Standard - Superseded. General recommendations for loading 65 C rise mineral-oil-immersed distribution and power transformers are covered.
This guide covers general recommendations for loading 65 °C rise mineral-oil-immersed distribution and power transformers described in the standards listed in clause . Recommendations for 55 °C rise transformers are included in annex because a substantial percentage of these transformers are still in service.
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. Risk areas are identified in clauses and , and in the annexes as noted.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number C57.91
Publication Date Nov. 30, 1995
Language en - English
Page Count 112
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