IEEE C57.12.70-2020(Redline)
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IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers (Redline)
| Published By | Publication Date | Number of Pages |
| IEEE | 2020 |
Revision Standard – Active. Standard terminal markings and connections are described for single-phase and three phase distribution, power, and regulating transformers. For terminal markings, it covers sequence designation, external terminal designation, neutral terminal designation, grounded terminal designation, and marking of full and tap winding terminals. Additive and subtractive polarity and parallel transformer operation are described. Connections of single-phase transformers in various configurations and angular displacement of three-phase transformers to connect to various system phase displacements are covered.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | IEEE Std C57.12.70™-2020 Front Cover |
| 2 | Title page |
| 4 | Important Notices and Disclaimers Concerning IEEE Standards Documents |
| 8 | Participants |
| 10 | Introduction |
| 11 | Contents |
| 12 | 1. Overview 1.1 Scope 1.2 Purpose 1.3 Word usage |
| 13 | 2. Normative references |
| 14 | 3. Definitions, acronyms, and abbreviations 4. Marking of terminals and identification of windings 4.1 General 4.2 Sequence designation |
| 15 | 4.3 External and Internal terminal designation 4.4 Neutral terminal designation 4.5 Grounded terminal designation 5. Single-phase transformers 5.1 Types of transformers |
| 16 | 5.2 Polarity |
| 20 | 5.3 Order of numbering terminals of any winding 5.4 Order of numbering terminals of different windings |
| 21 | 5.5 Location of H1 terminal 5.6 Parallel operation |
| 23 | 6. Angular displacement and connections for single-phase transformers in three-phase and six-phase banks |
| 27 | 7. Phase relationships and terminal markings for three-phase transformers 7.1 Relation between highest voltage winding and other windings |
| 30 | 7.2 Phase relationships and terminal markings 7.3 Marking of full winding terminals |
| 31 | 7.4 Tap leads |
| 32 | 7.5 Location of external terminals |
| 34 | 7.6 Interphase connections made outside of case 7.7 Parallel operation |
| 35 | 8. Terminal markings for three-phase to six-phase transformers 8.1 General 8.2 Marking of full winding terminals |
| 36 | 8.3 Relation between three phase and six phase windings 8.4 Tap leads |
| 37 | Annex A (informative) Winding connection details and explanations A.1 Wye Winding Configurations |
| 38 | A.2 Delta Winding Configurations |
| 39 | A.3 Zigzag (interconnected star) Winding Configurations |
| 40 | A.4 Combining the various winding configurations |
| 46 | A.5 Examples |
| 48 | A.6 Winding combinations and explanation drawings |
| 58 | Annex B (informative) Bibliography |
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