IEEE C57.144 : 2004
IEEE C57.144 : 2004
GUIDE FOR METRIC CONVERSION OF TRANSFORMER STANDARDS
Institute of Electrical & Electronics Engineers
Table of Contents
1. Overview
1.1 Scope
1.2 Purpose
2. References
3. Guidelines
3.1 Application of converted values
3.2 "Hard" and "soft" conversion
3.3 Use convenient numbers
3.4 Convert fractions
3.5 Determine tolerance
3.6 Maintain original minimums and maximums
3.7 Significant digits should be less than 10% of the
overall tolerance
3.8 Method for conversion of toleranced values
3.9 Gauge and absolute pressure
3.10 Maintain significant digits
3.11 The precision of a value
3.12 Trade sizes
3.13 Standard for rounding
3.14 Conversion math
3.15 Writing unit symbols
3.16 Capitalization
3.17 Units of force and mass
3.18 Specifying a quantity with a tolerance
3.19 Dual dimensioning
3.20 Temperature conversion
3.21 Default tolerances
3.22 Convenience and drawing clarity
3.23 Separate + and - tolerances
3.24 Safety issues
Annex A (normative) Conversion of quantities common to
transformer standards
Annex B (normative) Guideline background and development
Annex C (informative) Bibliography
Abstract
Provides assist to the working groups within the IEEE Transformers Committee; thus, specific examples were taken from the transformer-related standards. It should be recognized that identification of general principles and procedures could have broader application.
General Product Information
| Document Type | Standard |
| Status | Current |
| Publisher | Institute of Electrical & Electronics Engineers |
