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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
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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
...