IEC 60076-22-4:2019

IEC 60076-22-4 ®
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 22-4: Power transformer and reactor fittings – Insulating liquid to water heat
exchangers
Transformateurs de puissance –
Partie 22-4: Accessoires pour transformateurs de puissance et bobines
d’inductance – Hydroréfrigérants

All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and once 67 000 electrotechnical terminology entries in English and
a month by email. French extracted from the Terms and Definitions clause of IEC
publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or need CISPR.

further assistance, please contact the Customer Service

Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Le premier dictionnaire d'électrotechnologie en ligne au monde,
webstore.iec.ch/advsearchform avec plus de 22 000 articles terminologiques en anglais et en
La recherche avancée permet de trouver des publications IEC français, ainsi que les termes équivalents dans 16 langues
en utilisant différents critères (numéro de référence, texte, additionnelles. Egalement appelé Vocabulaire
comité d’études,…). Elle donne aussi des informations sur les Electrotechnique International (IEV) en ligne.

projets et les publications remplacées ou retirées.
Glossaire IEC - std.iec.ch/glossary
IEC Just Published - webstore.iec.ch/justpublished 67 000 entrées terminologiques électrotechniques, en anglais
Restez informé sur les nouvelles publications IEC. Just et en français, extraites des articles Termes et Définitions des
Published détaille les nouvelles publications parues. publications IEC parues depuis 2002. Plus certaines entrées
Disponible en ligne et une fois par mois par email. antérieures extraites des publications des CE 37, 77, 86 et
CISPR de l'IEC.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
Electropedia - www.electropedia.org

IEC 60076-22-4 ®
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 22-4: Power transformer and reactor fittings – Insulating liquid to water

heat exchangers
Transformateurs de puissance –

Partie 22-4: Accessoires pour transformateurs de puissance et bobines

d’inductance – Hydroréfrigérants

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.180 ISBN 978-2-8322-6635-9

– 2 – IEC 60076-22-4:2019 © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 General requirements . 8
4.1 Service conditions . 8
4.2 Performance requirements . 8
4.3 Degree of protection of electrical components (IP) . 8
4.4 Corrosion protection . 8
4.4.1 External (atmosphere) . 8
4.4.2 Insulating liquid side . 9
4.4.3 Water side . 9
4.5 Insulating liquid characteristics . 9
5 Design and characteristics . 9
5.1 General . 9
5.2 Main components and characteristics . 9
5.2.1 General . 9
5.2.2 Shell . 9
5.2.3 Tube bundle in double tube arrangement . 9
5.2.4 Headers . 10
5.3 General characteristics . 10
5.3.1 Rating plate information . 10
5.3.2 Information to be provided with enquiry and order. 10
5.3.3 Rated cooling capacity . 11
5.3.4 Mechanical design . 11
5.3.5 Preparation for transport and storage . 13
5.3.6 Mounting and operating conditions . 14
6 Tests . 14
6.1 General requirements for tests . 14
6.1.1 General . 14
6.1.2 List of tests . 14
6.2 Routine tests. 15
6.2.1 Tightness test insulating liquid side . 15
6.2.2 Tightness test water side . 15
6.2.3 Visual inspection . 15
6.2.4 Cleanliness . 15
6.3 Type tests – Rated values test . 15
Annex A (informative) Details of the heat exchangers . 16
A.1 Masses and dimensions . 16
A.2 Collection and forms of suspensory types . 16
A.3 Collection and forms of horizontal types . 17
A.4 Collection and forms of vertical standing types. 18
A.5 Parts list – Materials – Common selection of materials . 19
A.6 Example for fresh water . 20

Annex B (informative) Rating conditions of the heat exchangers . 21
B.1 General . 21
B.2 Definitions, symbols . 21
B.3 Calculation of capacity in service . 21
B.3.1 Service capacity for different temperatures at inlet according to Figure
B.1 . 21
B.3.2 Service capacity for different mass flows according to Figure B.2 for
plain tubes and according to Figure B.3 for finned tubes . 21
B.3.3 Service capacity for different mass flows and different temperatures . 22
B.3.4 Example for calculation of 25 % capacity margin of new heat
exchangers . 22
Annex C (informative) Example for calculation of capacity in service . 26
Bibliography . 28

Figure A.1 – Collection and forms of suspensory types . 16
Figure A.2 – Collection and forms of horizontal types . 17
Figure A.3 – Collection and forms of vertical standing types . 18
Figure B.1 – Capacity factor depending on inlet temperatures of oil and water . 23
Figure B.2 – Capacity factor depending on mass for plain tubes . 24
Figure B.3 – Capacity factor depending on mass for finned tubes . 25

Table 1 – Water quality data . 12
Table 2 – Mandatory fittings . 13
Table A.1 – Examples of material selection depending on water quality . 20
Table A.2 – Average values for chemically neutral water (fresh water) . 20

– 4 – IEC 60076-22-4:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER TRANSFORMERS –
Part 22-4: Power transformer and reactor fittings –
Insulating liquid to water heat exchangers

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and
...