IEC 60076-22-5:2021

Power transformers - Part 22-5: Power transformer and reactor fittings - Electric pumps for transformers

IEC 60076-22-5:2021 covers electric pumps used in the cooling circuits of power transformers and reactors. It applies to electric pumps mounted 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 operation requirements for the electrical and hydraulic performance, mechanical design, routine testing and type testing. Additionally, performance and dimensions of preferred sizes of pump sets are specified in informative annexes.
The pumps covered in this document are rotodynamic pumps driven by a squirrel cage induction motor that is immersed in the insulating liquid.
Pump sets conforming to this document can be of in-line or end suction design.

Transformateurs de puissance - Partie 22-5 : Accessoires pour transformateurs de puissance et bobines d’inductance - Electropompes pour transformateurs

L’IEC 60076-22-5:2021 couvre les électropompes utilisées dans les circuits de refroidissement des transformateurs de puissance et des bobines d’inductance. Elle s’applique aux électropompes électriques montées sur des transformateurs de puissance immergés dans un liquide conformes à l'IEC 60076-1 et aux bobines d’inductance conformes à l'IEC 60076-6 avec et sans conservateur pour des installations intérieures ou extérieures.
Elle définit les exigences de fonctionnement pour les performances électriques et hydrauliques, la conception mécanique, les essais individuels de série et les essais de type. De plus, les performances et les dimensions des tailles préférentielles des groupes de pompes sont spécifiées dans les annexes informatives.
Le présent document couvre les pompes rotodynamiques entraînées par un moteur à induction à cage immergé dans le liquide isolant.
Les groupes de pompes conformes au présent document peuvent être des pompes en ligne ou à aspiration axiale.

General Information

• Status: Published
• Publication Date: 17-Jan-2021
• 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: 25-Jan-2021
• Completion Date: 18-Jan-2021

Standards Content (Sample)

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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