IEC 60076-1:1993

Power transformers - Part 1: General

Applies to three-phase and single-phase transformers including autotransformers. Defines the rating and connection symbols. Gives certain specifications for transformers having a tapped winding. Defines information which shall be marked on the rating plate and the tests to be conducted. Supersedes IEC 60076-1(1976) and IEC 60076-4 (1976).

Transformateurs de puissance - Partie 1: Généralités

S'applique aux transformateurs triphasés et monophasés y compris aux autotransformateurs. Définit le régime assigné et les symboles de couplage. Donne certaines prescriptions pour les transformateurs avec enroulement à prise. Définit les informations qui doivent figurer sur la plaque signalétique et les essais à effectuer. Cette édition annule et remplace les CEI 60076-1 (1976) et 60076-4 (1976)

General Information

• Status: Published
• Publication Date: 16-Jun-1997
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: TC 14 - Power transformers
• Drafting Committee: MT 5 - TC 14/MT 5
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 20-Apr-2011

Relations

• Amended By: IEC 60076-1:1993/AMD1:1999 - Amendment 1 - Power transformers - Part 1: General
• Effective Date: 05-Sep-2023
• Revised: IEC 60076-1:2011 - Power transformers - Part 1: General
• Effective Date: 05-Sep-2023

Standards Content (Sample)

Publication 60076-1 de la CEI
IEC Publication 60076-1
(Deuxième édition
- 1993)
(Second edition - 1993)
Transformateurs de puissance
— Power transformers
—
Partie 1: Généralités
Part 1: General
CORRIGENDUM 1
Page 77
Page 76
Article A.1.2: Clause A.1.2
...

IEC 60076-1
Edition 2.1 2000-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 1: General
Transformateurs de puissance –
Partie 1: Généralités
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IEC 60076-1
Edition 2.1 2000-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 1: General
Transformateurs de puissance –
Partie 1: Généralités
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CN
CODE PRIX
ICS 29.180 ISBN 2-8318-5034-7
60076-1 © IEC:1993+A1:1999 – 3 –
– 2 – 60076-1 © IEC:1993+A1:1999
CONTENTS
Page
FOREWORD . 4
Clause
1 Scope and service conditions. 5
1.1 Scope . 5
1.2 Service conditions. 5
2 Normative references. .6
3 Definitions. .7
3.1 General. .7
3.2 Terminals and neutral point. .8
3.3 Windings. . 9
3.4 Rating. 10
3.5 Tappings. 1 1
3.6 Losses and no-load current. 13
3.7 Short-circuit impedance and voltage drop . 13
3.8 Temperature rise . 14
3.9 Insulation. 14
3.10 Connections. 14
3.11 Kinds of tests. 15
3.12 Meteorological data with respect to cooling. 16
4 Rating. 16
4.1 Rated power . 16
4.2 Loading cycle. 17
4.3 Preferred values of rated power . 17
4.4 Operation at higher than rated voltage and/or at disturbed frequency. 17
5 Requirements for transformers having a tapped winding . 17
5.1 General – Notation of tapping range . 17
5.2 Tapping voltage – tapping current. Standard categories of tapping voltage
variation. Maximum voltage tapping . 18
5.3 Tapping power. Full-power tappings – reduced-power tappings . 2 1
5.4 Specification of tappings in enquiry and order. 22
5.5 Specification of short-circuit impedance . 22
5.6 Load loss and temperature rise. 23
6 Connection and phase displacement symbols for three-phase transformers . 23
7 Rating plates. 26
7.1 Information to be given in all cases. 26
7.2 Additional information to be given when applicable . 26
8 Miscellaneous requirements. 27
8.1 Dimensioning of neutral connection . 27
8.2 Oil preservation system . 27
8.3 Load rejection on generator transformers. 28
9 Tolerances. 28

60076-1 © IEC:1993+A1:1999 – 5 –
60076-1 © IEC:1993+A1:1999 – 3 –
Clause Page
10 Tests . 30
10.1 General requirements for routine, type and special tests. 30
10.2 Measurement of winding resistance . 3 1
10.3 Measurement of voltage ratio and check of phase displacement . 32
10.4 Measurement of short-circuit impedance and load loss . 32
10.5 Measurement of no-load loss and current . 32
10.6 Measurement of the harmonics of the no-load current. 33
10.7 Measurement of zero-sequence impedance(s) on three-phase transformers . 33
10.8 Tests on on-load tap-changers. 34
11 Electromagnetic compatibility (EMC). 34
Annex A (normative) Information required with enquiry and order. 35
Annex B (informative) Examples of specifications for transformers with tappings. 38
Annex C (informative) Specification of short-circuit impedance by boundaries. 40
Annex D (informative) Three-phase transformer connections. 4 1
Annex E (normative) Temperature correction of load loss. 44
Annex F (informative) Bibliography. 45
Figure 1a) – Constant flux voltage variation CFVV .20
Figure 1b) – Variable flux voltage variation VFVV.20
Figure 1c) – Combined voltage variation CbVV.2 1
Figure 2 – Illustration of 'clock number' notation – three examples .24
Figure C.1 – Example of specification of short-circuit impedance by boundaries.40
Figure D.1 – Common connections.4 1
Figure D.2 – Additional connections .42
Figure D.3 – Designation of connections of three-phase auto-transformers by connection
symbols. Auto-transformer Ya0. .43
Figure D.4 – Example of three single-phase transformers connected to form a three-phase
bank (connection symbol Yd5).43

60076-1 © IEC:1993+A1:1999 – 7 –
– 4 – 60076-1 © IEC:1993+A1:1999
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
POWER TRANSFORMERS –
Part 1: General
FOREWORD
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