IEC 60076-24:2020

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

IEC 60076-24:2020 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.

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.

General Information

• Status: Published
• Publication Date: 08-Jul-2020
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: TC 14 - Power transformers
• Drafting Committee: WG 34 - TC 14/WG 34
• Current Stage: PPUB - Publication issued
• Start Date: 31-Jul-2020
• Completion Date: 09-Jul-2020

Standards Content (Sample)

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)
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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

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER TRANSFORMERS –
Part 24: Specification of voltage regulating
distribution transformers (VRDT)

FOREWORD
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International Standard IEC 60076-24 has been prepared by IEC technical committee 14: Power
transformers.
The text of this International Standard is based on the following documents:
FDIS Report on voting
14/1050/FDIS 14/1055/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60076 series, published under the general title Power transformers,
can be found on the IEC website.

– 4 – IEC 60076-24:2020 © IEC 2020
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
POWER TRANSFORMERS –
Part 24: Specification of voltage regulating
distribution transformers (VRDT)

1 Scope
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.
2 Normative references
...