IEEE C57.92-1981
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
IEEE Guide for Loading Mineral-Oil-Immersed Power Transformers Up to and Including 100 MVA with 55 C or 65 C Average Winding Rise
17-10-2023
14-12-1981
1. Scope
2. References
3. General
3.1 Limitations
3.2 Transformer Life Expectancy
3.3 Transformer Rated Output
3.4 Aging of Insulation
3.5 Ambient Temperature and Its Influence on Loading
3.6 Operation With Part or All of the Cooling Out of
Service
3.7 Supplemental Cooling of Existing Self-Cooled
Transformers
4. Transformers Specified to Have an Average Winding
Rise of Not More Than 65 deg C and Hottest-Spot
Winding Rise of Not More Than 80 deg C
4.1 Basic Loading for Normal Life Expectancy
4.2 Short-Time Loading with Moderate Sacrifice of Life
Expectancy
5. Transformers Specified to Have an Average Winding
Rise of Not More Than 55 deg C and Hottest-Spot
Winding Rise of Not More Than 65 deg C
5.1 Basic Loading for Normal Life Expectancy
5.2 Short-time Loading with Moderate Sacrifice of Life
Expectancy
6. Calculation of Temperature and Loss of Life for
Short-Time Loads Above Transformer Rating
6.1 General
6.2 Top-Oil Rise Determination
6.3 Hottest-Spot Conductor to Top-Oil Gradient
6.4 Hottest-Spot Conductor Temperature
6.5 Percent Loss of Life
6. Method of Converting Actual to Equivalent Load Cycle
6.7 Equations for Calculating Transient Heating of Oil-
Immersed Transformers
7. Method Used for Computer Calculation of Loading
Capability Tables
7.1 Method
FIGURES
1. Life Expectancy Curve
2. Approximate Continuous Loading for Normal Life
Expectancy-65 deg C Rise Transformers
3. Maximum Loss of Life - 65 deg Rise Transformers
4. Approximate Continuous Loading for Normal Life
Expectancy-55 deg C Rise Transformers
5. Maximum Percent Loss of Life - 55 deg C Rise Trans-
formers
6.(a) and (b) Initial Oil Rise
7.(a) and (b) Top-Oil Temperature at End of Specified
Load Period
8.(a) and (b) Ultimate Oil Rise
9.(a) and (b) Hottest-Spot Conductor To Top-Oil Gradient
10. Assumed Load Cycle
11. Actual Load Cycle
NUMEROUS TABLES
APPENDIX
Unusual Temperature and Altitude Conditions
Describes loading mineral-oil-immersed power transformers, manufactured in accordance with ANSI C57.12.10-1976 (1) and ANSI C57.12.30-1977 (2) and others up to and including 100 MVA maximum nameplate rating. Based mostly on ageing of winding insulation.
| Committee |
Transformers
|
| DocumentType |
Standard
|
| PublisherName |
Institute of Electrical & Electronics Engineers
|
| Status |
Withdrawn
|
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