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IEEE C57.91-1981

Historical Revision

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

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New IEEE Standard - Superseded.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.
This guide covers general recommendations for loading 65 "C rise mineral-oilimmersed overhead and pad-mounted distribution transformers described in American National Standards and rated 500 kVA and less. (For transformers rated 501 kVA and larger, see ANSI/IEEE C57.92-1981, [31') Recommendations for 55 "C rise transformers are included in this guide because a substantial percentage of these transformers are still in service.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number C57.91
Publication Date July 31, 1981
Language en - English
Page Count 26
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