EN 50708-2-3:2022
(Main)Power transformers - Additional European requirements - Part 2-3: Medium power transformer - Accessories
Power transformers - Additional European requirements - Part 2-3: Medium power transformer - Accessories
This document describes the list of typical accessories used for liquid and dry type Medium Power Transformers (≤ 3 150 kVA).
Leistungstransformatoren - Zusätzliche europäische Anforderungen - Teil 2-3: Mittelleistungstransformatoren - Zubehör
Transformateurs de puissance - Exigences européennes supplémentaires - Partie 2-3 : Transformateurs de moyenne puissance - Accessoires
Le présent document décrit la liste des accessoires types utilisés pour les transformateurs de moyenne puissance (≤ 3 150 kVA) à diélectrique liquide et de type sec.
Močnostni transformatorji - Dodatne evropske zahteve - 2-3. del: Srednji močnostni transformatorji - Pribor
Ta dokument opisuje sezname tipičnega pribora, ki se uporablja za srednje močnostne transformatorje (≤ 3150 kVA) vlažnega in suhega tipa. Določa vmesnik med terminali transformatorja, vključno s kabelskimi omaricami in električnim omrežjem.
General Information
Overview
EN 50708-2-3:2022 is a European standard developed by CLC that specifies additional European requirements for medium power transformers (up to 3,150 kVA), focusing specifically on the typical accessories used with liquid immersed and dry type transformers. This standard acts as a supplement to the general requirements outlined in EN 50708-1-1:2020 and other related parts of the EN 50708 series, ensuring harmonized and consistent accessory specifications for medium power transformers across Europe.
Key highlights include detailed design requirements, terminal configurations, and accessory lists, enhancing safety, interoperability, and serviceability of medium power transformers utilized in various electrical distribution and industrial applications.
Key Topics
Scope and Applicability
EN 50708-2-3:2022 applies to medium power transformers (≤ 3,150 kVA), covering accessories for both liquid immersed and dry type transformers. It is intended to be used alongside general EN 50708 parts that provide overarching requirements.Terminal Types and Markings
For liquid immersed transformers, terminals may be:- Open type bushings
- Plug-in type bushings
- Low voltage (LV) busbars
Terminal markings follow IEC/TR 60616 guidelines for consistency in identification of HV and LV terminals.
Mechanical Design Requirements
Important design details include:- Distance between bushings for different current ratings to facilitate safe and efficient wiring
- Specifications for wheels used in transformer mobility with defined maximum load capacities for various diameters
- Defined dimensions for filling holes and provisions for different filling pipe sizes by agreement
Accessories for Liquid Immersed Transformers
Standard accessories include tap changers, rating plates, lifting devices, wheels or skid chassis, and earthing terminals. Additional components like oil level indicators, dehydrating breathers, gas actuated relays, or removable radiators may be included as optional or when required.Accessories for Dry-Type Transformers
Typical accessories comprise HV and LV terminals, earthing terminals, warning plates, lifting devices, wheels or skid, and rating plates, aligned with requirements of EN IEC 60076-11.Compliance and Integration
The standard references and integrates related normative documents such as EN 50708 series parts, EN 50180, EN 50336, and EN IEC 60076-22-7:2020, ensuring comprehensive coverage of transformers and accessory requirements.
Applications
EN 50708-2-3:2022 is vital for manufacturers, designers, and users of medium power transformers within European markets, facilitating:
Standardized Manufacturing
Ensures accessory components meet consistent safety and performance criteria, simplifying production and quality assurance.Enhanced Installation Safety
Accurate terminal markings and standardized spacing reduce installation errors and improve operational safety.Operational Reliability
Defined accessory lists and design requirements provide clear guidance for accessory compatibility and system integration, reducing risks related to component conflicts.Maintenance and Replacement
Standardization of components like wheels, tap changers, and filling systems helps maintenance teams source compatible parts and perform servicing efficiently.
Industries benefiting from these medium power transformers include electrical utilities for distribution grids, manufacturing plants, commercial buildings, and infrastructure projects requiring reliable voltage transformation.
Related Standards
- EN 50708-1-1:2020 – Power transformers: General common requirements
- EN 50708-2-1 – Medium power transformers: General requirements
- EN IEC 60076-11 – Dry type transformers: Test methods and performance
- EN IEC 60076-22-7:2020 – Power transformer and reactor accessories and fittings
- EN 50180, EN 50336, EN 50386, EN 50387 – Bushings standards for transformers
- IEC/TR 60616 – Terminal and tapping markings for power transformers
These related documents provide the technical foundation and broader framework within which EN 50708-2-3:2022 fits, enabling comprehensive compliance for power transformer production and usage.
Keywords: EN 50708-2-3, medium power transformers, transformer accessories, liquid immersed transformers, dry-type transformers, European transformer standards, transformer terminals, transformer wheels, transformer design requirements, power transformer accessories, CLC standards.
Frequently Asked Questions
EN 50708-2-3:2022 is a standard published by CLC. Its full title is "Power transformers - Additional European requirements - Part 2-3: Medium power transformer - Accessories". This standard covers: This document describes the list of typical accessories used for liquid and dry type Medium Power Transformers (≤ 3 150 kVA).
This document describes the list of typical accessories used for liquid and dry type Medium Power Transformers (≤ 3 150 kVA).
EN 50708-2-3:2022 is classified under the following ICS (International Classification for Standards) categories: 29.180 - Transformers. Reactors. The ICS classification helps identify the subject area and facilitates finding related standards.
You can purchase EN 50708-2-3:2022 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CLC standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2022
Močnostni transformatorji - Dodatne evropske zahteve - 2-3. del: Srednji
močnostni transformatorji - Pribor
Power transformers - Additional European requirements - Part 2-3: Medium power
transformer - Accessories
Transformateurs de puissance - Exigences européennes supplémentaires - Partie 2-3 :
Transformateurs de moyenne puissance - Accessoires
Ta slovenski standard je istoveten z: EN 50708-2-3:2022
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50708-2-3
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2022
ICS 29.180
English Version
Power transformers - Additional European requirements -
Part 2-3: Medium power transformer - Accessories
Transformateurs de puissance - Exigences européennes Leistungstransformatoren - Zusätzliche europäische
supplémentaires - Partie 2-3 : Transformateurs de moyenne Anforderungen - Teil 2-3: Mittelleistungstransformatoren -
puissance - Accessoires Zubehör
This European Standard was approved by CENELEC on 2022-08-15. 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,
Türkiye 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50708-2-3:2022 E
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Service conditions . 5
5 Electrical characteristics . 5
6 Design requirements . 5
6.1 Liquid immersed transformers . 5
6.1.1 Type of liquid preservation system . 5
6.1.2 Terminals . 6
6.1.3 Terminal markings . 6
6.1.4 Distance between bushings . 6
6.1.5 Wheels . 6
6.1.6 Filling hole . 7
6.2 Dry-type transformers . 7
6.2.1 Terminals . 7
6.2.2 Terminal markings . 7
6.2.3 Wheels . 7
6.2.4 Enclosure. 7
7 Accessories . 7
7.1 Liquid immersed transformers . 7
7.2 Dry-type transformers . 9
Bibliography . 10
European foreword
This document (EN 50708-2-3:2022) has been prepared by CLC/TC 14 “Power transformers”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2023-08-15
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2025-08-15
conflicting with this 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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Introduction
This part of the EN 50708 series deals with the accessories.
For the purpose of this document, the requirements of the general EN 50708-1-1:2020 apply.
This document contains particular requirements for specific transformers or transformer applications, which
are based on the requirements of the general EN 50708-1-1:2020.
This document should be considered in conjunction with the requirements of the general parts.
The particular requirements of the different sub parts of EN 50708
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...