IEEE C57.12.70 2001

$52.54

Standard Terminal Markings and Connections for Distribution and Power Transformers

Published By	Publication Date	Number of Pages
IEEE	2001	33

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Description

– Inactive – Superseded.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.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Standard Terminal Markings and Connections for Distribution and Power Transformers
3	Introduction Participants
5	CONTENTS
7	1. Overview 1.1 Scope 1.2 References
9	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 phase transformers
10	3.1 Types of transformers
11	3.2 Subtractive and additive polarity
17	3.3 Order of numbering terminals of any winding 3.4 Order of numbering terminals of different windings
18	3.5 Location of H1 terminal 3.6 Parallel operation
19	4. Angular displacement and connections for single-phase transformers in three-phase and six-phas…
23	5. Phase relationships and terminal markings for three-phase transformers 5.1 Relation between highest voltage winding and other windings
25	5.2 Phase relationships and terminal markings 5.3 Marking of full winding terminals
26	5.4 Tap leads
27	5.5 Location of external terminals
29	5.6 Interphase connections made outside of case 5.7 Parallel operation 6. Terminal markings for three phase to six phase transformers 6.1 General 6.2 Marking of full winding terminals
30	6.3 Relation between three phase and six phase windings 6.4 Tap leads
31	7. Use of transformers with standard voltage diagrams in connecting systems of various phase disp… 7.1 General
32	7.2 0Ëš phase displacement: D D or Y Y 7.3 30Ëš lagging phase displacement: D Y or Y D 7.4 30Ëš leading phase displacement: D Y or Y D
33	7.5 Summary of preceding examples