Revision Standard – Superseded. Supersedes C57.12.70-1978 (R1992). 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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | IEEE Standard Terminal Markings and Connections for Distribution and Power Transformers <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Introduction Participants <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1. Overview 1.1 Scope 1.2 References <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 2. Marking of terminals and identification of windings 2.1 General 2.2 Sequence designation 2.3 External terminal designation 2.4 Neutral terminal designation 2.5 Grounded terminal designation 3. Single\ufffdphase transformers <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3.1 Types of transformers <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 3.2 Subtractive and additive polarity <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 3.3 Order of numbering terminals of any winding 3.4 Order of numbering terminals of different windings <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 3.5 Location of H1 terminal 3.6 Parallel operation <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 4. Angular displacement and connections for single-phase transformers in three-phase and six-phas… <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 5. Phase relationships and terminal markings for three-phase transformers 5.1 Relation between highest voltage winding and other windings <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 5.2 Phase relationships and terminal markings 5.3 Marking of full winding terminals <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 5.4 Tap leads <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 5.5 Location of external terminals <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 5.6 Interphase connections made outside of case 5.7 Parallel operation 6. Terminal markings for three\ufffdphase to six\ufffdphase transformers 6.1 General 6.2 Marking of full winding terminals <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 6.3 Relation between three\ufffdphase and six\ufffdphase windings 6.4 Tap leads <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 7. Use of transformers with standard voltage diagrams in connecting systems of various phase disp… 7.1 General <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 7.2 0\u02da phase displacement: D\ufffdD or Y\ufffdY 7.3 30\u02da lagging phase displacement: D\ufffdY or Y\ufffdD 7.4 30\u02da leading phase displacement: D\ufffdY or Y\ufffdD <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 7.5 Summary of preceding examples <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" IEEE Standard Terminal Markings and Connections for Distribution and Power Transformers<\/b><\/p>\n |