Revision Standard – Superseded. Superseded by IEEE Std C57.110-2008.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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | Title Page <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | Participants <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1. Overview 1.1 Scope 1.2 Purpose 2. References <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3. Definitions 3.1 Letter symbols <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 4. General considerations 4.1 Transformer losses <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4.2 Transformer capability equivalent 4.3 Basic data <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.4 Transformer per-unit losses 4.5 Transformer losses at measured currents <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.6 Harmonic Loss Factor for winding eddy currents <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4.7 Harmonic Loss Factor for other stray losses <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.6 Harmonic spectrum analysis 5.7 Design consideration in the windings <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 6. Recommended procedures for evaluating the load capability of existing transformers 6.1 Transformer capability equivalent calculation using design eddy-current loss data <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 6.2 Transformer capability equivalent calculation using data available from certified test report <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 6.3 Neutral bus capability for nonsinusoidal load currents that include third harmonic components <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Annex A\u2014Bibliography <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Annex B\u2014Comparison of UL K-factor definition of IEEE Std C57.110-1998 Harmonic Loss Factor definition <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Annex C\u2014Temperature rise testing procedures <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Annex D\u2014Tutorial discussion of transformer losses and the effect of harmonic currents on these losses <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" IEEE Recommended Practice for Establishing Transformer Capability When Supplying Nonsinusoidal Load Currents<\/b><\/p>\n |