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

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.

Leistungstransformatoren und Drosselspulen Anbauten - Teil 22-3: Isolierflüssigkeit-Luft-Wärmetauscher

Transformateurs de puissance - Partie 22-3: Accessoires pour transformateurs de puissance et bobines d’inductance - Aéroréfrigérants

La présente partie de l’IEC 60076 s’applique aux aéroréfrigérants, utilisant des circuits à circulation forcée d’air et de liquide, utilisés sur les transformateurs de puissance immergés (conformes à l’IEC 60076-1) et les bobines d’inductance (conformes à l’IEC 60076-6) avec ou sans conservateur pour les installations intérieures ou extérieures. Elle présente les conditions de service et les exigences mécaniques et électriques communes à cet équipement. Elle présente également les exigences de fonctionnement spécifiques à cet équipement et les dimensions préférentielles pertinentes pour l’interchangeabilité, ainsi que les essais de type et individuels de série à réaliser.

Hladilna oprema za močnostne transformatorje in dušilke – 22-3. del: Toplotni izmenjevalniki izolacijska tekočina-zrak (olje-zrak)

Ta standard se uporablja za zračne izmenjevalnike toplote s potisnim zračnim in tekočinskim krogom, ki se uporabljajo na v tekočini potopljenih močnostnih transformatorjih v skladu s standardom IEC 60076-1 in reaktorje v skladu s standardom IEC 60076-6 z raztezno posodo in brez nje za notranjo ter zunanjo namestitev. V njem so opisani servisni pogoji ter mehanske in električne zahteve, ki so skupne tej opremi. Določa tudi obratovalne zahteve za posamezno opremo in prednostne dimenzije, ki so pomembne za izmenljivost ter rutinske in tipske preskuse, ki jih je treba opraviti.

General Information

Status
Published
Publication Date
18-Apr-2019
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
06-Nov-2018

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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
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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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SIST EN IEC 60076-22-3:2019
– 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 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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SIST EN IEC 60076-22-3:2019
– 6 – IEC 60076-22-3:2019 © IEC 2019
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
– 8 – IEC 60076-22-3:2019 © IEC 2019

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
...

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