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IEEE C57.91

Guide for Loading Mineral-Oil-Immersed Transformers

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Organization: IEEE
Publication Date: 12 December 2002
Status: inactive
Page Count: 108
scope:

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 transformers are included in annex D because a substantial percentage of these transformers are still in service.

Document History

PC57.91/D8
December 1, 2023
Draft Guide for 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 system rated for a 65 °C average winding temperature rise, at rated...
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....
IEEE C57.91
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...
IEEE C57.91
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...
IEEE C57.91
December 5, 2001
Guide for Loading Mineral-Oil-Immersed Transformers
A description is not available for this item.
IEEE C57.91
January 29, 2001
Guide for Loading Mineral-Oil-Immersed Transformers
A description is not available for this item.
IEEE C57.91
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...
IEEE C57.91
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...
ANSI C57.91
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...
IEEE C57.91
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.
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References

This document references:
IEEE C57.100 - Test Procedure for Thermal Evaluation of Insulation Systems for Liquid-Immersed Distribution and Power Transformers
Published by IEEE on December 7, 2011
This standard applies to the insulation systems used in all liquid-immersed distribution and power transformers. This standard provides test procedures to evaluate the thermal aging characteristics...
This document is referenced by:
C37.121 - Switchgear - Unit Substations - Requirements
Published by NEMA on January 1, 1989
This standard covers the requirements for three-phase unit substations for step-down operation in the range of 112.5 kVA through 10 000 kVA at primary voltages of 601 volts through 38 kilovolts. The...
This document is referenced by:
ANSI C57.12.20 - Overhead-Type Distribution Transformers 500 kVA and Smaller; High Voltage, 34 500 V and Below; Low Voltage, 7970/13 800Y V and Below
Published by IEEE on September 28, 2017
This standard covers certain electrical, dimensional, and mechanical characteristics and safety features of single- and three-phase. 60 Kz. liquid-immersed, self-cooled, overhead-type distribution...
This document is referenced by:
BS EN 60076-2 - Power transformers Part 2: Temperature rise for liquid-immersed transformers
Published by BSI on May 31, 2011
A description is not available for this item.
This document is referenced by:
BS IEC 60076-7 - Power transformers Part 7: Loading guide for mineral-oil-immersed power transformers
Published by BSI on February 28, 2018
A description is not available for this item.
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