IEC 60076-22-5:2021

IEC 60076-22-5 ®
Edition 1.0 2021-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 22-5: Power transformer and reactor fittings – Electric pumps for
transformers
Transformateurs de puissance –
Partie 22-5: Accessoires pour transformateurs de puissance et bobines
d'inductance – Électropompes pour transformateurs

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IEC 60076-22-5 ®
Edition 1.0 2021-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 22-5: Power transformer and reactor fittings – Electric pumps for

transformers
Transformateurs de puissance –

Partie 22-5: Accessoires pour transformateurs de puissance et bobines

d'inductance – Électropompes pour transformateurs

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.180 ISBN 978-2-8322-9249-5

– 2 – IEC 60076-22-5:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Service conditions . 7
4.1 General . 7
4.2 Degree of protection of electrical components (IP) . 8
4.3 External corrosion protection . 8
4.4 Internal corrosion protection . 8
4.5 Insulating liquid characteristics . 8
5 General characteristics and requirements . 8
5.1 Rating plate information . 8
5.2 Direction of liquid flow and rotation . 9
5.3 General mechanical requirements . 9
5.4 Casing or enclosure . 9
5.5 Terminal box . 10
5.6 Materials . 10
5.7 Preferred sizes . 10
5.8 Performance requirements . 10
5.8.1 General . 10
5.8.2 Hydraulic performance . 11
5.8.3 Hydraulic interchangeability . 11
5.8.4 Electrical performance . 12
5.8.5 Noise . 13
5.9 Tests . 13
5.9.1 General . 13
5.9.2 List of tests . 13
5.9.3 Routine tests . 13
5.9.4 Type tests . 14
5.9.5 Special tests . 15
(informative) Preferred sizes of end suction pumps . 16
(informative) Preferred sizes of in-line pumps . 18
(informative) Information required with enquiry, proposal and purchase order . 19
(informative) Example of use of hydraulic interchangeability tolerances . 20
Bibliography . 24

Figure 1 – Hydraulic interchangeability across the allowable operating range . 11
Figure 2 – Hydraulic interchangeability across an actual flow range . 12
Figure A.1 – Dimensions of end suction pumps . 16
Figure B.1 – Dimensions of in-line pumps . 18
Figure D.1 – Pressure-flow characteristics . 20
Figure D.2 – Tolerances as given in 5.8.3 applied to pump A . 21
Figure D.3 – Pressure-flow characteristic of pump B superimposed on the
characteristic of pump A . 22

Figure D.4 – Pressure-flow characteristic of pumps C and D superimposed on the
characteristic of pump A . 22
Figure D.5 – Flow ranges . 23

Table A.1 – Dimensions of preferred sizes of end suction pumps (mm) . 17
Table B.1 – Dimensions of preferred sizes of in-line pumps (mm) . 18

– 4 – IEC 60076-22-5:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER TRANSFORMERS –
Part 22-5: Power transformer and reactor fittings –
Electric pumps for transformers

FOREWORD
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