EN 60740-1:2005

SLOVENSKI SIST EN 60740-1:2006

STANDARD
januar 2006
Laminati za transformatorje in dušilke – 1. del: Mehanske in električne
karakteristike (IEC 60740-1:2005)
(istoveten EN 60740-1:2005)
Laminations for transformers and inductors - Part 1: Mechanical and electrical
characteristics (IEC 60740-1:2005)
ICS 29.180 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 60740-1
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2005

ICS 29.100.10
English version
Laminations for transformers and inductors
Part 1: Mechanical and electrical characteristics
(IEC 60740-1:2005)
Tôles découpées pour transformateurs  Kernbleche für Transformatoren
et inductances und Drosseln
Partie 1: Caractéristiques électriques Teil 1: Mechanische und elektrische
et mécaniques Eigenschaften
(CEI 60740-1:2005) (IEC 60740-1:2005)

This European Standard was approved by CENELEC on 2005-08-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60740-1:2005 E
Foreword
The text of document 51/823/FDIS, future edition 1 of IEC 60740-1, prepared by IEC TC 51, Magnetic
components and ferrite materials, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60740-1 on 2005-08-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-08-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60740-1:2005 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61797-1 NOTE Harmonized as EN 61797-1:1996 (not modified).
__________
- 3 - EN 60740-1:2005
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1)
IEC 60050-221 - International electrotechnical vocabulary - -
Chapter 221: Magnetic materials and
components
IEC 60404-1 2000 Magnetic materials - -
Part 1: Classification
IEC 60404-8-4 1998 Part 8-4: Specifications for individul - -
materials - Cold-rolled non-oriented
electrical steel sheet and strip delivered
in the fully-processed state
IEC 60404-8-7 1998 Part 8-7: Specifications for individual - -
materials - Cold-rolled grain-oriented
electrical steel sheet and strip delivered
in the fully-processed state
IEC 60404-11 1991 Part 11: Method of test for the - -
determination of surface insulation
resistance of magnetic sheet and strip
A1 1998 - -
IEC 61021-1 1990 Laminated core packages for EN 61021-1 1997
transformers and inductors used in
telecommunication and electronic
equipment
Part 1: Dimensions
IEC 61021-2 1995 Part 2: Electrical characteristics for cores EN 61021-2 1997
using YEE 2 laminations
ISO 286-1 1988 ISO system of limits and fits EN 20286-1 1993
Part 1: Bases of tolerances, deviations
and fits
1)
Undated reference.
INTERNATIONAL IEC
STANDARD 60740-1
First edition
2005-08
Laminations for transformers and inductors –
Part 1:
Mechanical and electrical characteristics
 IEC 2005  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
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For price, see current catalogue

– 2 – 60740­1 ¤ IEC:2005(E)
CONTENTS
FOREWORD.6
1 Scope .8
2 Normative references.8
3 Terms, definitions and symbols.9
4 Materials and lamination thicknesses.13
4.1 Materials.13
4.2 Nominal lamination thickness.13
4.3 Minimum stacking factor.14
5 Designation of laminations and lamination strips.14
5.1 Specified complete shapes.14
5.2 Lamination strips for specified shapes.15
5.3 Lamination strips for non­specified laminations.16
6 Packing and marking.16
7 Electrical tests.16
7.1 General .16
7.2 Core constants.16
7.3 Magnetic path length .17
7.4 Core cross­section.17
8 General conditions for electrical measurements.18
8.1 Atmospheric conditions.18
8.2 Test coils.18
8.3 Test cores.18
8.4 Harmonic content of the voltage.18
9 Measurements at high field strength.18
9.1 General .18
9.2 Measurement of power loss.19
9.3 Measurement of total apparent power .21
10 Measurements at low and medium field strength .22
10.1 General .22
10.2 Measurement of amplitude permeability.22
11 Preferred ranges of laminations.23
12 Dimensions and tolerances.24
12.1 Dimensions.24
12.2 Tolerances.24
12.3 Symmetry tolerances.25
13 Dimensions and effective parameters.25
13.1 General .25
13.2 Lamination strips Type YS.25
13.3 Laminations Type YEI 1.26
13.4 Laminations Type YUI 1.27
13.5 Lamination Types YUI 2.30
13.6 Lamination Types YEx 2, YEE 2 and YEI 2.32
13.7 Lamination Types YEE 2­.L.33
13.8 Lamination Types YEx 3, YEE 3, YEF 3, YEI 3 and YEL 3.35

60740­1 ¤ IEC:2005(E) – 3 –
13.9 Lamination Types YEx 4, YEE 4 and YEF 4.36
13.10Laminations Type YM 1.38
14 Electrical characteristics for materials.39
15 Specific total apparent power for laminations.40
16 Specific power loss for laminations.41
17 Mechanical characteristics for laminations.42
17.1 General appearance and conditions.42
17.2 Cut and punch edge.42
17.3 Camber.43
17.4 Distortion.43
17.5 Bending.43
17.6 Insulation.43
17.7 Welding.44
Annex A (informative)  Conversion of polarisation and field strength into specific
total apparent power .45
A.1 Specific total apparent power from polarisation and field strength.45
A.2 Equations for the curves of the magnetic materials.49
A.3 Constants for non­oriented silicon steel C 21 .50
A.4 Specific reactive power and specific power loss for non­oriented silicon steel
C 21.52
A.5 Constants for grain­oriented silicon steel C 22 .54
A.6 Specific reactive power and specific power loss for grain­oriented silicon steel
C 22.56
A.7 Influence of the shape on the electrical characteristics for grain­oriented silicon steel
C 22.58
Bibliography.59
Figure 1 – Measurements at high field strength, direct and indirect method,  single­
phase cores.20
Figure 2 – Measurements at high field strength, direct method, three­phase cores.21
Figure 3 – Measurements at low and medium field strength.23
Figure 4 – Lamination strips Type YS, dimensions and tolerances.25
Figure 5 – Laminations Type YEI 1, dimensions.26
Figure 6 – Laminations Type YUI 1, dimensions.28
Figure 7 – Layer plan for the lamination strip s
...