SIST EN IEC 60076-24:2020

Power transformers - Part 24: Specification of Voltage Regulating Distribution Transformers (VRDT)

This document applies to medium power transformers from 25 kVA up to 3 150 kVA with highest
voltage for equipment up to 36 kV, or in low voltage (LV) networks with highest voltage for
equipment of up to 1,1 kV equipped with voltage regulating devices.
Voltage regulating distribution transformers are transformers equipped with components to
control primary or secondary voltage for on-load voltage regulation purposes.
The main objective of the installation of a VRDT is to regulate the LV network voltage level (i.e.
400 V), to avoid violation of the limits defined by relevant standards or regulations. The VRDT
must operate properly as a step down and step up transformer.
Transformers covered by this document comply with the relevant requirements set out in
IEC 60076 (all parts) and, unless otherwise stated in this document, they also comply with
European Standards EN 50160 and EN 50588-1.

Leistungstransformatoren - Teil 24: Spezifikation für spannungsregelbare Verteilungstransformatoren (VRDT)

Transformateurs de puissance - Partie 24: Spécification des transformateurs de distribution régulateurs de tension (VRDT)

L'IEC 60076-24:2020 s'applique aux transformateurs de moyenne puissance, de 25 kVA à 3 150 kVA, la tension la plus élevée pour le matériel allant jusqu'à 36 kV, ou dans les réseaux basse tension (BT) dont la tension la plus élevée pour le matériel atteint jusqu'à 1,1 kV, équipés de dispositifs régulateurs de tension.
Les transformateurs de distribution régulateurs de tension sont des transformateurs équipés de composants qui permettent de commander la tension primaire ou secondaire pour les besoins de la régulation de la tension en charge.
L'installation d'un VRDT a pour objectif principal de réguler le niveau de tension du réseau basse tension (400 V), afin d'éviter tout dépassement des limites définies par les normes ou réglementations pertinentes. Le VRDT doit fonctionner correctement en tant que transformateur abaisseur et élévateur.
Les transformateurs couverts par le présent document sont conformes aux exigences pertinentes définies dans l'IEC 60076 (toutes les parties) et sont également conformes aux Normes européennes EN 50160 et EN 50588-1, sauf indication contraire dans le présent document.

Močnostni transformatorji - 24. del: Specifikacija distribucijskh transformatorjev z regulacijo napetosti (VRDT)

General Information

• Status: Published
• Publication Date: 11-Oct-2020
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: ETR - Power transformers
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 07-Oct-2020
• Due Date: 12-Dec-2020
• Completion Date: 12-Oct-2020
• Ref Project: EN IEC 60076-24:2020 - Power transformers - Part 24: Specification of voltage regulating distribution transformers (VRDT)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60076-24:2020
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
SIST EN IEC 60076-24:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 60076-24:2020

---------------------- Page: 2 ----------------------
SIST EN IEC 60076-24:2020


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

---------------------- Page: 3 ----------------------
SIST EN IEC 60076-24:2020
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
EN IEC 60076-24:2020.
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


2

---------------------- Page: 4 ----------------------
SIST EN IEC 60076-24:2020
EN IEC 60076-24:2020 (E)
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)
3

---------------------- Page: 5 ----------------------
SIST EN IEC 60076-24:2020
EN IEC 60076-24:2020 (E)
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

4

---------------------- Page: 6 ----------------------
SIST EN IEC 60076-24:2020



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




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------
SIST EN IEC 60076-24:2020
– 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

---------------------- Page: 8 ----------------------
SIST EN IEC 60076-24:2020
IEC 60076-24:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

POWER TRANSFORMERS –

Part 24: Specification of voltage regulating
distribution transformers (VRDT)

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 electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of
...