Transformers and inductors for use in electronic and telecommunication equipment - Measuring methods and test procedures

This document describes a number of tests for use in determining the significant parameters
and performance characteristics of transformers and inductors for use in electronics and
telecommunication equipment. These test methods are designed primarily for transformers
and inductors used in all types of electronics applications that can be involved in any
specification for such components. Even though these tests can be useful to the other types
of transformers used in power distribution applications in utilities, industry, and others, the
tests discussed in this document can supplement or complement the tests but are not
intended to replace the tests in standards for transformers. Some of the tests described are
intended for qualifying a product for a specific application, while others are test practices used
for manufacturing and customer acceptance testing. The test methods described here include
those parameters most commonly used in the electronics transformer and inductor industry:
electric strength, resistance, power loss, inductance, impedance, balance, transformation
ratio and many others used less frequently.

Transformatoren und Drosseln für die Anwendung in elektronischen und nachrichtentechnischen Einrichtungen - Meßmethoden und Prüfverfahren

Transformateurs et inductances utilisés dans les équipements électroniques et de télécommunications - Méthodes de mesure et procédures d'essais

L'IEC 61007:2020 décrit plusieurs essais utilisés pour la détermination des paramètres importants et des caractéristiques de fonctionnement des transformateurs et inductances utilisés dans les équipements électroniques et de télécommunications. Ces méthodes d'essai sont principalement conçues pour les transformateurs et inductances utilisés dans tous les types d'applications électroniques qui peuvent être employés dans toute spécification de ces composants. Bien que ces essais puissent être utiles pour d'autres types de transformateurs utilisés dans les applications de distribution de puissance dans les services publics, dans l'industrie et d'autres secteurs, les essais traités dans le présent document peuvent s'ajouter aux essais décrits dans les normes relatives aux transformateurs ou les compléter, mais ne sont pas destinés à les remplacer. Certains des essais décrits visent à qualifier un produit pour une application spécifique, tandis que d'autres sont des pratiques d'essai utilisées lors de la fabrication et pour les essais d'acceptation client. Les méthodes d'essai décrites ici comprennent les paramètres les plus couramment utilisés dans l'industrie des transformateurs et inductances électroniques: rigidité diélectrique, résistance, perte de puissance, inductance, impédance, équilibre, rapport de transformation, et de nombreux autres paramètres utilisés moins fréquemment. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) domaine d'application: extension du domaine d'application de l'IEC 61007; b) Article 2: ajout de nouvelles références et mise à jour des références; c) Article 3: ajout de nouvelles définitions en 3.3, et redéfinition du produit tension-temps en 3.7; d) mise à jour des procédures d'essai; e) procédures d'essais d'environnement: ajout de nouvelles références; f) ajout des Annexes A à G.

Transformatorji in induktorji za uporabo v elektronski in telekomunikacijski opremi - Metode merjenja in preskusni postopki

General Information

Status
Published
Publication Date
21-Sep-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Sep-2020
Due Date
14-Nov-2020
Completion Date
22-Sep-2020

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SLOVENSKI STANDARD
SIST EN IEC 61007:2020
01-november-2020
Nadomešča:
SIST EN 61007:2002

Transformatorji in induktorji za uporabo v elektronski in telekomunikacijski opremi

- Metode merjenja in preskusni postopki

Transformers and inductors for use in electronic and telecommunication equipment -

Measuring methods and test procedures
Transformatoren und Drosseln für die Anwendung in elektronischen und
nachrichtentechnischen Einrichtungen - Meßmethoden und Prüfverfahren
Transformateurs et inductances utilisés dans les équipements électroniques et de
télécommunications - Méthodes de mesure et procédures d'essais
Ta slovenski standard je istoveten z: EN IEC 61007:2020
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN IEC 61007:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 61007:2020
---------------------- Page: 2 ----------------------
SIST EN IEC 61007:2020
EUROPEAN STANDARD EN IEC 61007
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 29.180; 29.100.10 Supersedes EN 61007:1997 and all of its amendments
and corrigenda (if any)
English Version
Transformers and inductors for use in electronic and
telecommunication equipment - Measuring methods and test
procedures
(IEC 61007:2020)

Transformateurs et inductances utilisés dans les Transformatoren und Drosseln für die Anwendung in

équipements électroniques et de télécommunications - elektronischen und nachrichtentechnischen Einrichtungen -

Méthodes de mesure et procédures d'essais Messmethoden und Prüfverfahren
(IEC 61007:2020) (IEC 61007:2020)

This European Standard was approved by CENELEC on 2020-08-24. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61007:2020 E
---------------------- Page: 3 ----------------------
SIST EN IEC 61007:2020
EN IEC 61007:2020 (E)
European foreword

The text of document 51/1319/CDV, future edition 3 of IEC 61007, prepared by IEC/TC 51 "Magnetic

components, ferrite and magnetic powder materials" was submitted to the IEC-CENELEC parallel vote

and approved by CENELEC as EN IEC 61007:2020.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-05-24

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2023-08-24

document have to be withdrawn

This document supersedes EN 61007:1997 and all of its amendments and corrigenda (if any).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61007:2020 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 61000-2-2 NOTE Harmonized as EN 61000-2-2
IEC 61000-3-12 NOTE Harmonized as EN 61000-3-12
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SIST EN IEC 61007:2020
EN IEC 61007:2020 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod),

the relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available

here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050 series International Electrotechnical Vocabulary - -
IEC 60068-1 2013 Environmental testing - Part 1: General EN 60068-1 2014
and guidance
IEC 60068-2-1 - Environmental testing - Part 2-1: Tests - EN 60068-2-1 -
Test A: Cold
IEC 60068-2-2 - Environmental testing - Part 2-2: Tests - EN 60068-2-2 -
Test B: Dry heat
IEC 60068-2-6 - Environmental testing - Part 2-6: Tests - EN 60068-2-6 -
Test Fc: Vibration (sinusoidal)
IEC 60068-2-7 - Basic environmental testing procedures - EN 60068-2-7 -
Part 2-7: Tests - Test Ga and guidance:
Acceleration, steady state
IEC 60068-2-10 - Environmental testing - Part 2-10: Tests - EN 60068-2-10 -
Test J and guidance: Mould growth
IEC 60068-2-13 - Basic environmental testing procedures - EN 60068-2-13 -
Part 2-13: Tests - Test M: Low air pressure
IEC 60068-2-14 - Environmental testing - Part 2-14: Tests - EN 60068-2-14 -
Test N: Change of temperature
IEC 60068-2-17 - Basic environmental testing procedures - EN 60068-2-17 -
Part 2-17: Tests - Test Q: Sealing
IEC 60068-2-20 - Environmental testing - Part 2-20: Tests - EN 60068-2-20 -
Test T: Test methods for solderability and
resistance to soldering heat of devices with
leads
IEC 60068-2-21 - Environmental testing - Part 2-21: Tests - EN 60068-2-21 -
Test U: Robustness of terminations and
integral mounting devices
IEC 60068-2-27 - Environmental testing - Part 2-27: Tests - EN 60068-2-27 -
Test Ea and guidance: Shock
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SIST EN IEC 61007:2020
EN IEC 61007:2020 (E)
Publication Year Title EN/HD Year
IEC 60068-2-30 - Environmental testing - Part 2-30: Tests - EN 60068-2-30 -
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
IEC 60068-2-42 - Environmental testing - Part 2-42: Tests - EN 60068-2-42 -
Test Kc: Sulphur dioxide test for contacts
and connections
IEC 60068-2-45 - Basic environmental testing procedures - EN 60068-2-45 -
Part 2-45: Tests - Test XA and guidance:
Immersion in cleaning solvents
IEC 60068-2-52 - Environmental testing – Part 2-52: Tests – EN IEC 60068-2--
Test Kb: Salt mist, cyclic (sodium chloride52
solution)
IEC 60068-2-78 - Environmental testing - Part 2-78: Tests - EN 60068-2-78 -
Test Cab: Damp heat, steady state
IEC 60270 - High-voltage test techniques - Partial EN 60270 -
discharge measurements
IEC 60695-11-2 - Fire hazard testing -- Part 11-2: Test - -
flames - 1 kW nominal premixed flame:
Apparatus, confirmatory test arrangement
and guidance
IEC 60695-11-5 - Fire hazard testing - Part 11-5: Test flames EN 60695-11-5 -
- Needle-flame test method - Apparatus,
confirmatory test arrangement and
guidance
IEC 61672-1 - Electroacoustics - Sound level meters - EN 61672-1 -
Part 1: Specifications
---------------------- Page: 6 ----------------------
SIST EN IEC 61007:2020
IEC 61007
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Transformers and inductors for use in electronic and telecommunication
equipment – Measuring methods and test procedures
Transformateurs et inductances utilisés dans les équipements électroniques et
de télécommunications – Méthodes de mesure et procédures d'essais
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10; 29.180 ISBN 978-2-8322-8620-3

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 61007:2020
– 2 – IEC 61007:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 6

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms and definitions ...................................................................................................... 9

4 Test procedures ............................................................................................................ 13

4.1 Test and measurement conditions ......................................................................... 13

4.1.1 General ......................................................................................................... 13

4.1.2 Measurement uncertainty............................................................................... 16

4.1.3 Alternative test methods ................................................................................ 16

4.2 Visual inspection ................................................................................................... 16

4.2.1 General ......................................................................................................... 16

4.2.2 Safety screen position ................................................................................... 16

4.2.3 Quality of joints ............................................................................................ 16

4.3 Dimensioning and gauging procedure ................................................................. 19

4.4 Electrical test procedures .................................................................................... 19

4.4.1 Winding resistance ...................................................................................... 19

4.4.2 Insulation tests .............................................................................................. 20

4.4.3 Losses ........................................................................................................... 23

4.4.4 Inductance ..................................................................................................... 27

4.4.5 Unbalance .................................................................................................... 27

4.4.6 Capacitance ................................................................................................. 32

4.4.7 Transformation ratios..................................................................................... 35

4.4.8 Resonant frequency ...................................................................................... 41

4.4.9 Signal transfer characteristics ....................................................................... 42

4.4.10 Cross-talk ...................................................................................................... 46

4.4.11 Frequency response ...................................................................................... 47

4.4.12 Pulse characteristics ...................................................................................... 48

4.4.13 Voltage-time product rating .......................................................................... 49

4.4.14 Total harmonic distortion .............................................................................. 50

4.4.15 Voltage regulation ......................................................................................... 51

4.4.16 Temperature rise ........................................................................................... 52

4.4.17 Surface temperature ..................................................................................... 53

4.4.18 Polarity .......................................................................................................... 54

4.4.19 Screens ........................................................................................................ 56

4.4.20 Noise ............................................................................................................ 57

4.4.21 Corona tests ................................................................................................. 58

4.4.22 Magnetic fields .............................................................................................. 58

4.4.23 Inrush current ................................................................................................ 61

4.5 Environmental test procedures ........................................................................... 61

4.5.1 General ......................................................................................................... 61

4.5.2 Soldering ...................................................................................................... 61

4.5.3 Robustness of terminations and integral mounting devices ............................ 61

4.5.4 Shock ............................................................................................................ 61

4.5.5 Bump ............................................................................................................. 62

4.5.6 Vibration (sinusoidal) ..................................................................................... 62

4.5.7 Acceleration, steady state .............................................................................. 62

4.5.8 Rapid change of temperature (thermal shock in air) ....................................... 62

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SIST EN IEC 61007:2020
IEC 61007:2020 © IEC 2020 – 3 –

4.5.9 Sealing .......................................................................................................... 62

4.5.10 Climatic sequence ......................................................................................... 62

4.5.11 Damp heat, steady state ................................................................................ 62

4.5.12 Dry heat ........................................................................................................ 63

4.5.13 Mould growth ................................................................................................. 63

4.5.14 Salt mist, cyclic (sodium chloride solution) ..................................................... 63

4.5.15 Sulphur dioxide test for contacts and connections.......................................... 63

4.5.16 Fire hazard .................................................................................................... 63

4.5.17 Immersion in cleaning solvents ...................................................................... 63

4.6 Endurance test procedures ................................................................................... 63

4.6.1 Short-term endurance (load run) .................................................................... 63

4.6.2 Long-term endurance (life test) ...................................................................... 64

Annex A (normative) DC resistance test ............................................................................... 65

A.1 General ................................................................................................................. 65

A.2 Resistance values under 1 Ω – Kelvin double-bridge method ................................ 65

A.3 Resistance values from 1 Ω to many kilo-ohms ..................................................... 66

A.3.1 General ......................................................................................................... 66

A.3.2 Ammeter and voltmeter method ..................................................................... 66

A.3.3 Substitution method ....................................................................................... 67

A.3.4 Wheatstone bridge ......................................................................................... 68

A.3.5 Ohmmeter ..................................................................................................... 69

A.4 Digital ohmmeter – Resistance values from under 1 Ω to many kilo-ohms ............. 70

Annex B (normative) Dielectric voltage withstand test .......................................................... 71

Annex C (normative) Induced voltage test ............................................................................ 73

C.1 Induced voltage test .............................................................................................. 73

C.2 General test conditions ......................................................................................... 73

C.3 General test methods ............................................................................................ 73

C.4 Induced excitation voltage and frequency ............................................................. 75

C.5 Repeated induced voltage testing ......................................................................... 75

C.6 Excitation current .................................................................................................. 75

Annex D (normative) No-load loss ........................................................................................ 76

D.1 General ................................................................................................................. 76

D.2 Excitation waveform .............................................................................................. 76

D.2.1 General ......................................................................................................... 76

D.2.2 Sine-voltage (sine-flux) excitation .................................................................. 76

D.2.3 Sine-current excitation ................................................................................... 77

D.2.4 Square-wave voltage excitation ..................................................................... 77

D.3 Test method and instrumentation .......................................................................... 78

D.3.1 General ......................................................................................................... 78

D.3.2 Wattmeter ...................................................................................................... 78

D.3.3 Ammeters ...................................................................................................... 79

D.3.4 Voltmeters ..................................................................................................... 79

D.4 Test specifications and results .............................................................................. 79

Annex E (normative) Quality factor, Q .................................................................................. 80

E.1 General ................................................................................................................. 80

E.2 Accuracy ............................................................................................................... 80

E.3 Generators ............................................................................................................ 80

E.3.1 Signal generator ............................................................................................ 80

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SIST EN IEC 61007:2020
– 4 – IEC 61007:2020 © IEC 2020

E.3.2 Pulse generator ............................................................................................. 80

E.3.3 Antenna ......................................................................................................... 80

E.4 Capacitor .............................................................................................................. 81

E.5 Measuring circuit................................................................................................... 81

E.5.1 Oscilloscope .................................................................................................. 81

E.5.2 Probe ............................................................................................................ 81

E.6 Measuring procedure ............................................................................................ 81

E.7 Calculation ............................................................................................................ 82

Annex F (normative) Electrostatic shielding ......................................................................... 84

F.1 Symbols ................................................................................................................ 84

F.2 Theoretical discussion .......................................................................................... 86

F.3 Measurement methods .......................................................................................... 87

F.3.1 Indirect method .............................................................................................. 87

F.3.2 Direct method ................................................................................................ 88

Annex G (normative) Corona test ......................................................................................... 89

G.1 Detection of corona ............................................................................................... 89

G.2 Analysis of corona ................................................................................................ 89

G.3 Test conditions and specifications ......................................................................... 90

Bibliography .......................................................................................................................... 91

Figure 1 – Pulse waveform parameters ................................................................................. 11

Figure 2 – Examples of good solder joints ............................................................................. 17

Figure 3 – Examples of defective joints ................................................................................. 18

Figure 4 – No-load current test schematic ............................................................................. 24

Figure 5 – No-load loss test schematic ................................................................................. 24

Figure 6 – Simplified diagram for short-circuit power test ...................................................... 26

Figure 7 – Circuit for measuring capacitance unbalance ....................................................... 28

Figure 8 – Circuit for determining common mode rejection ratio ............................................ 28

Figure 9 – Circuit for measuring impedance unbalance ......................................................... 29

Figure 10 – Circuit for determining cross-talk attenuation ...................................................... 30

Figure 11 – Schematic diagram of phase unbalance and amplitude unbalance ..................... 32

Figure 12 – Typical graph for determining self-capacitance ................................................... 34

Figure 13 – Circuit for determining inter-winding capacitance ............................................... 35

Figure 14 – Circuit for measurement of voltage transformation ratio ...................................... 38

Figure 15 – Circuit for measuring current transformation ratio and phase displacement ........ 39

Figure 16 – Measuring circuit of current transformation ratio and phase displacement .......... 40

Figure 17 – Circuit for determining parallel self-resonant frequency ...................................... 41

Figure 18 – Circuit for determining resonant frequency of resonant assemblies .................... 42

Figure 19 – Circuit for determination of insertion loss ........................................................... 43

Figure 20 – Use of two identical transformers when the transformation ratio is not unity

and/or a DC bias is required ................................................................................................. 44

Figure 21 – Illustration of return loss ..................................................................................... 45

Figure 22 – Basic return loss test circuit ............................................................................... 46

Figure 23 – Circuit diagram for measuring the crossover interference between two

transformer coils ................................................................................................................... 47

Figure 24 – Impulse waveform measuring circuit ................................................................... 49

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SIST EN IEC 61007:2020
IEC 61007:2020 © IEC 2020 – 5 –

Figure 25 – Non-linearity of magnetizing current ................................................................... 50

Figure 26 – Voltage regulation test schematic ....................................................................... 51

Figure 27 – Phase (polarity) test using voltage measurement ............................................... 54

Figure 28 – Series connection method .................................................................................. 55

Figure 29 – Helmholtz structure ............................................................................................ 59

Figure A.1 – Measurement of low resistance ......................................................................... 65

Figure A.2 – Kelvin double-bridge method of measuring low resistance ................................ 66

Figure A.3 – Ammeter and voltmeter method of resistance measurement ............................. 67

Figure A.4 – Measurement of resistance by substitution........................................................ 68

Figure A.5 – Connections of Wheatstone bridge .................................................................... 68

Figure A.6 – Principle of series ohmmeter ............................................................................. 69

Figure A.7 – Digital ohmmeter method of resistance measurement ....................................... 70

Figure B.1– Typical high-potential test, showing section 1 under test .................................... 71

Figure B.2– Typical high-potential test of inductor ................................................................. 71

Figure C.1 – Block diagram of induced voltage surge test ..................................................... 73

Figure D.1 – Triangular flux-density variation in transformer core .......................................... 78

Figure D.2 – Test circuit for transformer no-load losses ........................................................ 78

Figure E.1 – Damped oscillation method ............................................................................... 80

Figure E.2 – Oscilloscope sweep for damped oscillation method ........................................... 82

Figure F.1 – Shielded single winding, core floating ............................................................... 84

Figure F.2 – Basic electrostatic symbol ................................................................................. 84

Figure F.3 – Multiple-shielded single winding, core terminal (lead) provided ......................... 84

Figure F.4 – Shielded two-winding secondary, core grounded ............................................... 85

Figure F.5 – Shielded group of windings, core floating .......................................................... 85

Figure F.6 – Multiple-shielded group of windings, core terminal (lead) provided .................... 85

Figure F.7 – Combination of shielding conditions .................................................................. 86

Figure F.8 – Typical two-winding shielded transformer .......................................................... 86

Figure F.9 – Simplified representation of Figure F.8 .............................................................. 86

Figure F.10 – Indirect measuring method for electrostatic shielding ...................................... 87

Figure G.1 – Typical circuit for corona measurement (circuit 1) ...........................

...

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