SIST EN IEC 60076-22-3:2019

SLOVENSKI STANDARD
SIST EN IEC 60076-22-3:2019
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
SIST EN IEC 60076-22-3:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60076-22-3:2019

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SIST EN IEC 60076-22-3:2019


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

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SIST EN IEC 60076-22-3:2019
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
EN IEC 60076-22-3:2019.
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

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SIST EN IEC 60076-22-3:2019
EN IEC 60076-22-3:2019 (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 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


3

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SIST EN IEC 60076-22-3:2019

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SIST EN IEC 60076-22-3:2019



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




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

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SIST EN IEC 60076-22-3:2019
– 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

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SIST EN IEC 60076-22-3:2019
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

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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 and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus on the relevant subjects since each technical committee has representation from all interested IEC
National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60076-22-3 has been prepared by IEC technical committee 14:
Power transformers.
The text of this International Standard is based on the following documents:
FDIS Report on voting
14/995/FDIS 14/1003/RVD

Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60076 series, published under the general title Power transformers,
can be found on the IEC website.

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SIST EN IEC 60076-22-3:2019
IEC 60076-22-3:2019 © IEC 2019 – 5 –
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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INTRODUCTION
Under the part title “Power transformer and reactor fittings”, this part of IEC 60076-22 covers
the insulating liquid to air heat exchangers in the cooling circuits of power transformers and
reactors.

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SIST EN IEC 60076-22-3:2019
IEC 60076-22-3:2019 © IEC 2019 – 7 –
POWER TRANSFORMERS –

Part 22-3: Power transformer and reactor fittings –
Insulating liquid to air heat exchangers



1 Scope
This part of IEC 60076 applies to liquid to air heat exchangers, using forced air and forced liquid
circuits, used on liquid immersed power transformers according to IEC 60076-1 and reactors
according to IEC 60076-6 with and without conservator for indoor or outdoor installation. It
outlines the service conditions and the mechanical and electrical requirements that are common
to this equipment.
It also outlines the operation requirements specific to this equipment as well as the preferred
dimensions relevant for interchangeability and the type and routine tests to be performed.
2 Normative references
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.
IEC 60076-1, Power transformers – Part 1: General
IEC 60076-7, Power transformers – Part 7: Loading guide for mineral 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 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 (all parts), Pipe flanges
ISO 9614-2, Acoustics – Determination of sound power levels of noise sources using sound
intensity – Part 2: Measurement by scanning
ISO 12944 (all parts), Paints and varnishes – Corrosion protection of steel structures by
protective paint systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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SIST EN IEC 60076-22-3:2019
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ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
insulating liquid to air heat exchanger
component for the cooling of the insulating liquid of the transformer, using forced circulation of
the insulating liquid and a forced air flow
4 General requirements
4.1 Service conditions
The normal service conditions set out in IEC 60
...