IEEE C57.110-1998
$98.04
IEEE Recommended Practice for Establishing Transformer Capability When Supplying Nonsinusoidal Load Currents
| Published By | Publication Date | Number of Pages |
| IEEE | 1998 |
Revision Standard – Superseded. Superseded by IEEE Std C57.110-2008. Methods are developed to conservatively evaluate the feasibility of supplying additional nonsinusoidal load currents from an existing installed dry-type or liquified transformer, as a portion of the total load. Clarification of the necessary application information is provided to assist in properly specifying a new transformer expected to carry a load, a portion of which is composed of nonsinusoidal load currents. A number of examples illustrating these methods and calculations are presented. Reference annexes make a comparison of the document calculations to calculations found in other industry standards and suggested temperature rise methods are detailed for reference purposes.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | Title Page |
| 3 | Introduction |
| 4 | Participants |
| 7 | CONTENTS |
| 8 | 1. Overview 1.1 Scope 1.2 Purpose 2. References |
| 9 | 3. Definitions 3.1 Letter symbols |
| 10 | 4. General considerations 4.1 Transformer losses |
| 11 | 4.2 Transformer capability equivalent 4.3 Basic data |
| 12 | 4.4 Transformer per-unit losses 4.5 Transformer losses at measured currents |
| 13 | 4.6 Harmonic Loss Factor for winding eddy currents |
| 16 | 4.7 Harmonic Loss Factor for other stray losses |
| 17 | 5. Design considerations for new transformer specification 5.1 Harmonic current filtering 5.2 Impact on the neutral 5.3 Power factor correction equipment 5.4 Electrostatic ground shields 5.5 Design consideration outside the windings |
| 18 | 5.6 Harmonic spectrum analysis 5.7 Design consideration in the windings |
| 19 | 6. Recommended procedures for evaluating the load capability of existing transformers 6.1 Transformer capability equivalent calculation using design eddy-current loss data |
| 25 | 6.2 Transformer capability equivalent calculation using data available from certified test report |
| 33 | 6.3 Neutral bus capability for nonsinusoidal load currents that include third harmonic components |
| 34 | Annex A—Bibliography |
| 36 | Annex B—Comparison of UL K-factor definition of IEEE Std C57.110-1998 Harmonic Loss Factor definition |
| 39 | Annex C—Temperature rise testing procedures |
| 45 | Annex D—Tutorial discussion of transformer losses and the effect of harmonic currents on these losses |
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