EN IEC 60076-24:2020

SLOVENSKI STANDARD
01-november-2020
Močnostni transformatorji - 24. del: Specifikacija distribucijskh transformatorjev z
regulacijo napetosti (VRDT)
Power transformers - Part 24: Specification of Voltage Regulating Distribution
Transformers (VRDT)
Ta slovenski standard je istoveten z: EN IEC 60076-24:2020
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 60076-24

NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 29.180
English Version
Power transformers - Part 24: Specification of voltage regulating
distribution transformers (VRDT)
(IEC 60076-24:2020)
Transformateurs de puissance - Partie 24: Spécification des Leistungstransformatoren - Teil 24: Spezifikation für
transformateurs de distribution régulateurs de tension spannungsregelnde Verteilungstransformatoren (VRDT)
(VRDT) (IEC 60076-24:2020)
(IEC 60076-24:2020)
This European Standard was approved by CENELEC on 2020-08-13. 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 60076-24:2020 E

European foreword
The text of document 14/1050/FDIS, future edition 1 of IEC 60076-24, prepared by IEC/TC 14 "Power
transformers" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-05-13
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-08-13
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 60076-24:2020 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 60068-2 (series) NOTE Harmonized as EN IEC 60068-2 (series)
IEC 60076-13 NOTE Harmonized as EN 60076-13

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 60068-2-1 - Environmental testing - Part 2-1: Tests - EN 60068-2-1 -
Test A: Cold
IEC 60068-2-2 - Environmental testing - Part 2-2: Tests - EN 60068-2-2 -
Test B: Dry heat
IEC 60068-2-11 - Basic environmental testing procedures - - -
Part 2-11: Tests - Test Ka: Salt mist
IEC 60068-2-30 - Environmental testing - Part 2-30: Tests - EN 60068-2-30 -
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
IEC 60068-2-78 - Environmental testing - Part 2-78: Tests - EN 60068-2-78 -
Test Cab: Damp heat, steady state
IEC 60076-1 - Power transformers - Part 1: General EN 60076-1 -
IEC 60076-2 - Power transformers - Part 2: Temperature EN 60076-2 -
rise for liquid-immersed transformers
IEC 60076-5 - Power transformers - Part 5: Ability to EN 60076-5 -
withstand short circuit
IEC 60076-7 - Power transformers -- Part 7: Loading - -
guide for oil-immersed power transformers
IEC 60076-10 - Power transformers - Part 10: EN 60076-10 -
Determination of sound levels
IEC 60076-11 - Power transformers - Part 11: Dry-type EN IEC 60076-11 -
transformers
IEC 60076-12 - Power transformers - Part 12: Loading - -
guide for dry-type power transformers
IEC 60255-21-1 - Electrical relays - Part 21: Vibration, shock, EN 60255-21-1 -
bump and seismic tests on measuring
relays and protection equipment - Section
One: Vibration tests (sinusoidal)
Publication Year Title EN/HD Year
IEC 60255-21-2 - Electrical relays - Part 21: Vibration, shock, EN 60255-21-2 -
bump and seismic tests on measuring
relays and protection equipment - Section
Two: Shock and bump tests
IEC 60529 - Degrees of protection provided by - -
enclosures (IP Code)
IEC 61000-6-2 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-6-2 -
6-2: Generic standards - Immunity
standard for industrial environments
IEC 61000-6-4 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-6-4 -
6-4: Generic standards - Emission
standard for industrial environments
IEC 61000-6-5 - Electromagnetic compatibility (EMC) - Part EN 61000-6-5 -
6-5: Generic standards - Immunity for
equipment used in power station and
substation environment
IEC 61010-1 - Safety requirements for electrical - -
equipment for measurement, control, and
laboratory use - Part 1: General
requirements
IEC 61010-2-201 - Safety requirements for electrical - -
equipment for measurement, control, and
laboratory use - Part 2-201: Particular
requirements for control equipment
- - Power transformers - Additional European EN 50708 -
requirements
IEC 60076-24 ®
Edition 1.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 24: Specification of voltage regulating distribution transformers (VRDT)

Transformateurs de puissance –

Partie 24: Spécification des transformateurs de distribution régulateurs de

tension (VRDT)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.180 ISBN 978-2-8322-8564-0

– 2 – IEC 60076-24:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Environmental conditions . 7
5 Electrical characteristics and general requirements . 7
5.1 General . 7
5.2 Regulation steps . 7
5.3 Voltage steps . 8
5.4 Regulation range . 8
6 Service life . 8
7 Parallel operation of the VRDT . 8
8 Loss level . 8
9 Sound power level . 8
10 Rating plate . 8
11 Tests . 9
11.1 Routine tests. 9
11.2 Functional tests . 9
11.3 Type tests . 9
11.4 Special tests . 9
11.5 Tests for the control unit (electronic or data transfer part) . 10
11.5.1 Functionality test during erection and commissioning. 10
11.5.2 Type tests . 10
Bibliography . 11

IEC 60076-24:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER TRANSFORMERS –
Part 24: Specification of voltage regulating
distribution transformers (VRDT)

FOREWORD
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