EN IEC 60076-22-7:2020

SLOVENSKI STANDARD
01-september-2020
Močnostni transformatorji - 22-7. del: Močnostni transformatorji in dušilke - Pribor
Power transformers - Part 22-7: Power transformer and reactor fittings - Accessories and
fittings
Ta slovenski standard je istoveten z: EN IEC 60076-22-7:2020
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60076-22-7

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2020
ICS 29.180
English Version
Power transformers - Part 22-7: Power transformer and reactor
fittings - Accessories and fittings
(IEC 60076-22-7:2020)
Transformateurs de puissance - Partie 22-7: Leistungstransformatoren - Teil 22-7: Zubehörteile von
Transformateur de puissance et bobines d'inductance - Leistungstransformatoren und Drosselspulen - Zubehörteile
Accessoires et équipements und Armaturen
(IEC 60076-22-7:2020) (IEC 60076-22-7:2020)
This European Standard was approved by CENELEC on 2020-06-11. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60076-22-7:2020 E

European foreword
The text of document 14/1044/FDIS, future edition 1 of IEC 60076-22-7, prepared by IEC/TC 14
"Power transformers" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN IEC 60076-22-7:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-03-11
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-06-11
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 60076-22-7:2020 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 60076-5 NOTE Harmonized as EN 60076-5
IEC 60076-6 NOTE Harmonized as EN 60076-6
IEC 60255-5:2000 NOTE Harmonized as EN 60255-5:2001 (not modified)

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 60068-3-3 1991 Environmental testing - Part 3-3: Guidance EN 60068-3-3 1993
- Seismic test methods for equipments
IEC 60068-3-3 2019 Environmental testing - Part 3-3: EN IEC 60068-3-3 2019
Supporting documentation and guidance -
Seismic test methods for equipment
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 60255-27 -  Measuring relays and protection equipment EN 60255-27 -
- Part 27: Product safety requirements
IEC 60296 -  Fluids for electrotechnical applications - EN 60296 -
Unused mineral insulating oils for
transformers and switchgear
IEC 60529 -  Degrees of protection provided by - -
enclosures (IP Code)
IEC 60721-3-4 -  Classification of environmental conditions - EN IEC 60721-3-4 -
Part 3-4: Classification of groups of
environmental parameters and their
severities - Stationary use at non-
weatherprotected locations
ISO 3601-1 -  Fluid power systems - O-rings – Part 1: - -
Inside diameters, cross-sections,
tolerances and designation codes
ISO 7005-1 -  Pipe flanges – Part 1: Steel flanges for - -
industrial and general service piping
systems
ISO 12944-6 -  Paints and varnishes – Corrosion EN ISO 12944-6 -
protection of steel structures by protective
paint systems – Part 6: Laboratory
performance test methods
IEC 60076-22-7 ®
Edition 1.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 22-7: Power transformer and reactor fittings – Accessories and fittings

Transformateurs de puissance –

Partie 22-7: Transformateur de puissance et bobines d'inductance – Accessoires

et équipements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.180 ISBN 978-2-8322-8284-7

– 2 – IEC 60076-22-7:2020  IEC:2020
CONTENTS
FOREWORD . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Service conditions . 10
4.1 General . 10
4.2 Corrosion protection . 10
4.3 Resistance to ambient conditions . 10
4.4 Insulating liquid characteristics . 10
5 General requirements for routine and type test . 10
6 Accessories and fittings . 10
6.1 Thermometer pockets . 10
6.1.1 General . 10
6.1.2 Identification and nameplate . 11
6.1.3 Test . 11
6.1.4 Dimensions of thermometer pockets . 11
6.2 Earthing terminal . 12
6.2.1 General . 12
6.2.2 Dimensions of different earth terminals . 12
6.3 Draining plug . 15
6.3.1 General . 15
6.3.2 Materials . 15
6.3.3 Dimensions of different devices . 15
6.4 Air vent and liquid draining device . 17
6.4.1 General . 17
6.4.2 Materials . 17
6.4.3 Dimensions of different devices . 18
6.5 Wheel assembly – General requirements . 18
6.6 Dehydrating breathers . 18
6.6.1 General . 18
6.6.2 Common requirements . 19
6.6.3 Additional requirements for conventional manual replacement types . 19
6.6.4 Additional aspects for self-regenerating types . 22
6.6.5 Tests . 25
6.7 Butterfly valves . 26
6.7.1 General . 26
6.7.2 Requirements and characteristics . 26
6.7.3 Valve components . 26
6.7.4 Assembly arrangements and dimensions . 27
6.7.5 Performances . 28
6.7.6 Tests . 29
6.7.7 Supply conditions . 30
6.8 Junction terminal boxes . 30
6.8.1 General . 30
6.8.2 Degree of protection . 30
6.8.3 Function of the junction terminal box . 30

IEC 60076-22-7:2020  IEC:2020 – 3 –
6.8.4 General construction . 30
6.8.5 Overall dimensions . 31
6.8.6 Preferred functional and manufacturing characteristics of the box . 31
6.8.7 Preferred functional and manufacturing characteristics of the terminals . 31
6.8.8 Performance . 31
6.8.9 Tests . 32
6.9 Sampling device . 33
6.9.1 General . 33
6.9.2 Requirements and characteristics . 33
6.9.3 Tests . 35
Annex A (informative) Earthing pad current capacity calculation . 37
A.1 Theory . 37
A.2 Application to earthing pads . 38
Annex B (informative) Wheel assembly . 40
B.1 Introduction to wheel selection . 40
B.
...