IEC 60076-22-3:2019

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

IEC 60076-22-3:2019 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.
Keywords: insulating liquid to air heat exchangers in the cooling circuits of power transformers and reactors

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

IEC 60076-22-3:2019 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.
Mots clés: aéroréfrigérants dans les circuits de refroidissement des transformateurs de puissance et des bobines d’inductance

General Information

• Status: Published
• Publication Date: 07-Mar-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: TC 14 - Power transformers
• Drafting Committee: WG 32 - TC 14/WG 32
• Current Stage: PPUB - Publication issued
• Start Date: 05-Apr-2019
• Completion Date: 08-Mar-2019

Standards Content (Sample)

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

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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

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
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