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IEEE C57.115-1991

IEEE C57.115-1991

$48.21

IEEE Guide for Loading Mineral-Oil-Immersed Power Transformers Rated in Excess of 100 MVA (65C Winding Rise) (Folded into C57.91-1995) (65C Winding Rise) (Withdrawn)

Published By Publication Date Number of Pages
IEEE 1991 40
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Revision Standard – Inactive-Withdrawn. The guide covers modern power transformers rated above 100 MVA, three-phase equivalent and 65°C rise. The general approach is tutorial. Four different types of loading, that is, normal life expectancy loading, planned loading beyond nameplate rating, long-time emergency loading, and short-time emergency loading, are considered. The various effects of loading a transformer in excess of its nameplate rating are discussed. Temperature and maximum loading limitations are suggested.

PDF Catalog

PDF Pages PDF Title
7 1 Scope
2 General
2.1 References
2.2 Effect of Loading Beyond Nameplate Rating
8 2.3 Types of Loading and Their Interrelationship
2.3.2 Planned Loading Beyond Nameplate Rating
9 2.3.3 Long-Time Emergency Loading
2.3.4 Short-Time Emergency Loading
Table 1 Coordination of Suggested Loading Type Duration and Temperature Range
Table 2 Suggested Maximum Temperature Limits for the Four Types of Loading
10 Emergency Rating
11 2.3.5 Interrelationship of Loading Types
2.3.6 Risk Considerations
12 2.4 Temperature Limitations
2.5 Maximum Loading Limitations
2.6 Information for User Calculations
isnotsupplied
13 2.7 Voltage and Frequency Considerations
3 Calculation of Temperature
3.1 List of Symbols
14 3.2 Temperature Determination Equations
3.3 Equation Corrections
3.4 OilTimeConstant
15 3.5 LoadLoss
3.6 ViscosityofO il
3.7 Aging of Insulation
16 Fig 2 Reciprocal of Absolute Temperature Scale
17 OutlinedintheGuide
18 3.8 Approximating Ambient Temperature for Air-cooled Transformers
3.8.1 Average Temperature
3.8.2 Average of Maximum Daily Temperatures
3.9 Basic Logic Diagram of Computer Program
4 Operation with Part or All of the Cooling Out of Service
4.1 For OA/FA and OA/FA/FA Transformers
4.2 For OA/FA/FOA and OA/FOA/FOA Transformers
19 4.3 For FOA and FOW Transformers
21 Appendix A Thermal Evolution of Gas from Transformer Insulation.(References
24 Tap Changers and Auxiliary Components

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IEEE C57.115-1991
$48.21