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IEEE C57.91

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

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Organization: IEEE
Publication Date: 7 December 2011
Status: active
Page Count: 120
scope:

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.

Purpose

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.

1 Information of references can be found in Clause 2.

Document History

IEEE C57.91
December 7, 2011
Guide for Loading Mineral-Oil-Immersed Transformers and Step-Voltage Regulators
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....
December 12, 2002
Guide for Loading Mineral-Oil-Immersed Transformers
This guide covers general recommendations for loading 65 ºC rise mineral-oil-immersed distribution and power transformers described in the standards listed in clause 2. Recommendations for 55 ºC rise...
January 29, 2002
Guide for Loading Mineral-Oil-Immersed Transformers
This guide covers general recommendations for loading 65 ºC rise mineral-oil-immersed distribution and power transformers described in the standards listed in clause 2. Recommendations for 55 ºC rise...
December 5, 2001
Guide for Loading Mineral-Oil-Immersed Transformers
A description is not available for this item.
January 29, 2001
Guide for Loading Mineral-Oil-Immersed Transformers
A description is not available for this item.
June 14, 1995
Guide for Loading Mineral-Oil-Immersed Transformers
This guide covers general recommendations for loading 65 °C rise mineral-oil-immersed distribution and power transformers described in the standards listed in clause 2. Recommendations for 55 °C rise...
June 14, 1995
Guide for Loading Mineral-Oil-Immersed Transformers
This guide covers general recommendations for loading 65 °C rise mineral-oil-immersed distribution and power transformers described in the standards listed in clause 2 Recommendations for 55 °C rise...
July 31, 1981
Guide For Loading Mineral-Oil-Immersed Overhead And Pad-Mounted Distribution Transformers Rated 500 KVA And Less With 65 Degrees C or 55 Degrees C Average Winding Rise
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...
March 15, 1979
GUIDE FOR LOADING MINERAL-OIL-IMMERSED OVERHEAD AND PAD-MOUNTED DISTRIBUTION TRANSFORMERS RATED 500 KVA AND LESS WITH 65 DEGREES C OR 55 DEGREES C AVERAGE WINDING RISE (R 1991)
A description is not available for this item.

References

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