EN IEC 60076-22-3:2019

SLOVENSKI STANDARD
01-november-2019
Hladilna oprema za močnostne transformatorje in dušilke – 22-3. del: Toplotni
izmenjevalniki izolacijska tekočina-zrak (olje-zrak)
Power transformer and reactor cooling equipment - Part 22-3: Insulating liquid to air heat
exchangers
Ta slovenski standard je istoveten z: EN IEC 60076-22-3:2019
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60076-22-3

NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2019
ICS 29.180
English Version
Power transformers - Part 22-3: Power transformer and reactor
fittings - Insulating liquid to air heat exchangers
(IEC 60076-22-3:2019)
Transformateurs de puissance - Partie 22-3: Accessoires Leistungstransformatoren und Drosselspulen
pour transformateurs de puissance et bobines d'inductance Kühlungseinrichtung - Teil 22-3: Isolierte Flüssigkeit-Luft-
- Aéroréfrigérants Wärmetauscher
(IEC 60076-22-3:2019) (IEC 60076-22-3:2019)
This European Standard was approved by CENELEC on 2019-04-12. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60076-22-3:2019 E

European foreword
The text of document 14/995/FDIS, future edition 1 of IEC 60076-22-3, prepared by IEC/TC 14 "Power
transformers" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-01-12
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-04-12
document have to be withdrawn
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 60076-22-3:2019 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 60076-6 NOTE Harmonized as EN 60076-6
ISO 3506-1 NOTE Harmonized as EN ISO 3506-1
ISO 9001 NOTE Harmonized as EN ISO 9001

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 60076-1 -  Power transformers - Part 1: General EN 60076-1 -
IEC 60076-7 -  Power transformers - Part 7: Loading guide for oil- - -
immersed power transformers
IEC 60296 -  Fluids for electrotechnical applications - Unused - -
mineral insulating oils for transformers and
switchgear
IEC 60529 -  Degrees of protection provided by enclosures (IP - -
Code)
ISO 3746 -  Acoustics - Determination of sound power levels EN ISO 3746 -
and sound energy levels of noise sources using
sound pressure - Survey method using an
enveloping measurement surface over a reflecting
plane
ISO 4406 -  Hydraulic fluid power - Fluids - Method for coding - -
the level of contamination by solid particles
ISO 7005 series Pipe flanges - series
ISO 9614-2 -  Acoustics - Determination of sound power levels EN ISO 9614-2 -
of noise sources using sound intensity - Part 2:
Measurement by scanning
ISO 12944 series Paints and varnishes - Corrosion protection of EN ISO 12944 series
steel structures by protective paint systems

IEC 60076-22-3 ®
Edition 1.0 2019-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 22-3: Power transformer and reactor fittings – Insulating liquid to air heat

exchangers
Transformateurs de puissance –

Partie 22-3: Accessoires pour transformateurs de puissance et bobines

d’inductance – Aéroréfrigérants

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.180 ISBN 978-2-8322-6634-2

– 2 – IEC 60076-22-3:2019 © 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 Degree of protection of electrical components (IP) . 8
4.3 Corrosion protection . 8
4.3.1 External (atmosphere) . 8
4.3.2 Insulating liquid side . 8
4.4 Insulating liquid characteristics . 8
5 Design and characteristics . 9
5.1 Main components and characteristics . 9
5.1.1 Headers . 9
5.1.2 Tube sheets . 9
5.1.3 Tube bundle . 9
5.1.4 Turbulators . 9
5.1.5 Passes . 9
5.1.6 Standard design and cooling arrangement . 9
5.2 General characteristics . 9
5.2.1 Rating plate information . 9
5.2.2 Rated cooling capacity . 10
5.2.3 Information to be provided with enquiry and order. 10
5.2.4 Mechanical design . 11
5.2.5 Preparation for transport and storage . 12
6 Tests . 13
6.1 General requirements for tests . 13
6.1.1 General . 13
6.1.2 List of tests . 13
6.2 Routine tests. 13
6.2.1 Tightness tests . 13
6.2.2 Visual inspection . 14
6.2.3 Functional test . 14
6.2.4 Cleanliness . 14
6.2.5 External painting . 14
6.3 Type tests – Rated values test . 14
Annex A (informative) Design details of heat exchangers . 15
A.1 Dimensions and designs . 15
A.1.1 General . 15
A.1.2 Schematic design of cooling unit (without oil pump) . 15
A.1.3 Versions of flange arrangement . 16
A.2 Constructional materials – Common selection of materials . 17
Annex B (informative) Performance of heat exchangers . 18
B.1 General . 18
B.2 Performance of heat exchangers. 18

IEC 60076-22-3:2019 © IEC 2019 – 3 –
B.3 Variation of cooling capacity as function of average oil temperature rise . 19
B.4 Variation of cooling capacity for modified flow quantities . 20
B.4.1 Variation of cooling capacity as function of air flow quantity . 20
B.4.2 Variation of cooling capacity as function of oil flow quantity . 21
Bibliography . 22

Figure A.1 – Schematic design of cooling unit (without oil pump) . 15
Figure A.2 – Versions of flange arrangement . 16
Figure B.1 – General diagram for cooling temperatures . 18
Figure B.2 – Variation of cooling capacity as function of average oil temperature rise . 19
Figure B.3 – Variation of cooling capacity as function of air flow quantity . 20
Figure B.4 – Variation of cooling capacity as function of oil flow quantity . 21

Table 1 – Mandatory fittings . 12

– 4 – IEC 60076-22-3:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER TRANSFORMERS –
Part 22-3: Power transformer and reactor fittings –
Insulating liquid to air 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 electronic fields. To this end
...