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IEEE C57.12.70 2012

IEEE C57.12.70 2012

$58.50

IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers

Published By Publication Date Number of Pages
IEEE 2012 56
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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 C57.12.70-2011 Front Cover
3 Title page
6 Introduction
Notice to users
Laws and regulations
Copyrights
7 Updating of IEEE documents
Errata
Interpretations
Patents
8 Participants
10 Contents
11 Important Notice
1. Overview
1.1 Scope
1.2 Purpose
2. Normative references
12 3. Marking of terminals and identification of windings
3.1 General
3.2 Sequence designation
3.3 External and Internal terminal designation
13 3.4 Neutral terminal designation
3.5 Grounded terminal designation
4. Single-phase transformers
4.1 Types of transformers
4.1.1 Distribution transformers, liquid insulated
4.1.2 Power transformers, liquid insulated
4.1.3 Dry type transformers
14 4.1.4 Autotransformers
4.2 Polarity
19 4.3 Order of numbering terminals of any winding
4.3.1 Terminal numbers
4.3.2 Series-multiple winding
4.3.3 Two leads through one bushing
4.4 Order of numbering terminals of different windings
4.5 Location of H1 terminal
20 4.6 Parallel operation
21 5. Angular displacement and connections for single-phase transformers in three-phase and six-phase banks
25 6. Phase relationships and terminal markings for three-phase transformers
6.1 Relation between highest voltage winding and other windings
6.1.1 Phase sequence markings
6.1.2 Phase relationship markings
27 6.2 Phase relationships and terminal markings
6.3 Marking of full winding terminals
6.3.1 General
6.3.2 Autotransformers
28 6.4 Tap leads
29 6.5 Location of external terminals
6.5.1 Station type transformers
31 6.5.2 Overhead transformers
6.5.3 Distribution substation transformers
6.5.4 Padmounted, compartment-type transformers
6.6 Interphase connections made outside of case
6.7 Parallel operation
32 7. Terminal markings for three-phase to six-phase transformers
7.1 General
7.2 Marking of full winding terminals
33 7.3 Relation between three phase and six phase windings
7.4 Tap leads
7.4.1 Diametrical connections
7.4.2 Double delta connection
34 8. Use of transformers with standard voltage diagrams in connecting systems of various phase displacements
35 Annex A (informative) Winding connection details and explanations
A.1 Wye windings configurations
36 A.2 Delta windings configurations
37 A.3 Zigzag (interconnected star) winding configurations
38 A.4 Combining the various winding configurations
46 A.5 Examples
A.5.1 Example 1:
A.5.2 Example 2:
A.5.3 Example 3:
A.5.4 Example 4:
A.5.5 Example 5:
A.5.6 Example 6:
A.5.7 Example 7:
A.5.8 Example 8:
47 A.6 Winding combinations and explanation drawings
55 Annex B (informative) Bibliography

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IEEE C57.12.70 2012
$58.50