Revision Standard – Superseded. This recommended practice provides calculation methods to conservatively evaluate the feasibility for an existing installed dry-type or liquid-filled transformer, to supply nonsinusoidal load currents as a portion of the total load. This recommended practice also provides necessary application information 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 provide a comparison of the document calculations to calculations found in other industry standards. Suggested temperature rise calculation methods are detailed for reference purposes.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | IEEE Std C57.110-2008 Front Cover <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Title Page <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Notice to users Laws and regulations Copyrights Updating of IEEE documents Errata Interpretations <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | Patents Participants <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | Contents <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Important Notice 1. Overview 1.1 Scope 1.2 Purpose <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 2. Normative references 3. General considerations 3.1 Transformer losses <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.2 Transformer capability equivalent <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.3 Basic data 3.4 Transformer per-unit losses <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 3.5 Transformer losses at measured currents <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 3.6 Harmonic loss factorTPPT for winding eddy currents <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 3.7 Harmonic loss factor for other stray losses <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 4. Design considerations for new transformer specification 4.1 Harmonic current filtering 4.2 Impact on the neutral 4.3 Power factor correction equipment <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 4.4 Electrostatic ground shields 4.5 Design consideration outside the windings 4.6 Harmonic spectrum analysis 4.7 Design consideration in the windings <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 5. Recommended procedures for evaluating the load capability of existing transformersTPPT 5.1 Transformer capability equivalent calculation using design eddy-current loss data <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 5.2 Transformer capability equivalent calculation using data available from certified test report <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 5.3 Typical calculations for dry-type transformers <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 5.4 Typical calculations for liquid-filled transformers <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | 5.5 Neutral bus capability for nonsinusoidal load currents that include third harmonic components <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Annex A (informative)Bibliography <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Annex B (informative)Comparison of UL K-factor definition and IEEE C57.110 harmonic loss factor definition <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Annex C (informative)Temperature rise testing procedures <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | Annex D (informative)Tutorial 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 Liquid-Filled and Dry-Type Power and Distribution Transformer Capability When Supplying Nonsinusoidal Load Currents<\/b><\/p>\n |