BS EN 50708-1-1-2020 (2021) PDF

Full title and description

BS EN 50708-1-1:2020 — Power transformers. Additional European requirements. Part 1-1: Common part — General requirements. This common-part standard defines supplementary European requirements that apply across the EN 50708 series for power transformers manufactured and assessed in accordance with EN 60076‑1, covering ratings, service conditions, energy performance, testing, tolerances and documentation.

Abstract

EN 50708-1-1:2020 provides the general, cross-cutting requirements for members of the EN 50708 series. It consolidates terminology and definitions, sets rules for rated values and service conditions, specifies energy-performance provisions (including the Peak Efficiency Index calculation and related documentation requirements), and establishes testing and tolerance rules that supplement EN 60076‑1. The document is intended to harmonize requirements used for medium and large power transformers across Europe.

General information

• Status: Current (EN published 2020; adopted as BS in 2021).
• Publication date: EN publication: 28 May 2020; BS adoption/publication date: 21 January 2021.
• Publisher: European Committee for Electrotechnical Standardization (CENELEC) — original EN; British Standards Institution (BSI) — national adoption as BS EN.
• ICS / categories: 29.180 — Transformers; Reactors.
• Edition / version: Edition 2020 (BS adoption 2021); includes amendment/approval reference AC:2020 where issued.
• Number of pages: 36 (typical EN/BS text; some national-language publications with amendment pages show slight page-count variations).

Scope

This common-part standard applies to power transformers that are manufactured and assessed in accordance with EN 60076‑1 and provides additional European requirements that are common to the subsequent parts of EN 50708 (e.g., parts addressing medium and large power transformers). It covers definitions, rated values and ratings, service and environmental conditions, energy-performance rules and exclusions, testing requirements and tolerances, and documentation/marking needed to demonstrate compliance with the EN 50708 series. The standard is intended to align product, testing and documentation practice across jurisdictions in the EU/EEA.

Key topics and requirements

• Definitions and scope clarifications for the EN 50708 series (common terminology for medium and large power transformers).
• Rules for rated values and service conditions (rated power, voltage, frequency, ambient and site conditions).
• Energy-performance requirements, calculation methods and metrics (including Peak Efficiency Index — PEI — and related reference conditions and exclusions).
• Testing requirements and tolerances that supplement EN 60076‑1 test procedures.
• Documentation, marking and information to be provided with the transformer (technical files, declarations and data for energy-performance evaluation).
• References to applicable Ecodesign and regulatory provisions where relevant (alignment with EU energy-performance regulations for transformers).

Typical use and users

Primary users are transformer manufacturers, design engineers, conformity-assessment and testing laboratories, utilities and transmission/distribution specifiers, procurement teams and regulatory bodies. The standard is used to prepare technical specifications, perform type testing and energy-performance assessments, and to ensure products meet European-compliance expectations when EN 60076‑1 is the normative reference.

Related standards

Key related documents include EN 60076‑1 (Power transformers — Part 1: General), other parts of the EN 50708 series (e.g., Part 2 for medium power and Part 3 for large power transformers), and earlier standards that EN 50708 replaces or consolidates such as EN 50588-1 and EN 50629; national adoptions and amendments (e.g., EN 50708-1-1:2020/AC:2020) may also apply.

Keywords

Power transformer; transformers; EN 50708; additional European requirements; general requirements; energy performance; PEI; ratings; testing; EN 60076; BSI; CENELEC; ecodesign.

FAQ

Q: What is this standard?

A: It is the common-part European standard (EN 50708-1-1:2020) that sets additional, cross-cutting requirements for power transformers manufactured/assessed to EN 60076‑1; adopted nationally as BS EN 50708-1-1:2020 (BS publication dated 21 January 2021).

Q: What does it cover?

A: General requirements common to the EN 50708 series: definitions, rated values and service conditions, energy-performance rules (including PEI), testing and tolerances, documentation and marking, and alignment with relevant EU energy-performance requirements.

Q: Who typically uses it?

A: Manufacturers, design engineers, test laboratories, utilities and procurement/specification teams, and regulators who need harmonized European requirements for transformer performance, testing and documentation.

Q: Is it current or superseded?

A: As of its EN issue in 2020 and BSI adoption in January 2021, EN 50708-1-1:2020 / BS EN 50708-1-1:2020 is the current common-part document for the EN 50708 series; it replaces or consolidates earlier documents such as EN 50588-1 and EN 50629 where noted. Check national catalogues for any later corrigenda or revisions.

Q: Is it part of a series?

A: Yes — it is the common part (Part 1‑1) of the EN 50708 series; other parts provide requirements specific to categories such as medium power (Part 2‑1) and large power transformers (Part 3, etc.).

Q: What are the key keywords?

A: Power transformers, ratings, energy performance, Peak Efficiency Index (PEI), testing, tolerances, EN 60076, EN 50708, ecodesign, documentation.