EN 60076-5:2006

Power transformers - Part 5: Ability to withstand short-circuit

Identifies the requirements for power transformers to sustain without damage the effects of overcurrents originated by external short circuits. Describes the calculation procedures used to demonstrate the thermal ability of a power transformer to withstand such overcurrents and both the special test and the theoretical evaluation method used to demonstrate the ability to withstand the relevant dynamic effects.

Leistungstransformatoren - Teil 5: Kurzschlussfestigkeit

Transformateurs de puissance - Partie 5: Tenue au court-circuit

Identifie les exigences pour les transformateurs de puissance pour résister sans dommage aux effets des surcharges occasionnées par des courts-circuits externes. Décrit les procédés de calcul utilisés pour démontrer l'aptitude thermique d'un transformateur de puissance à supporter de telles surcharges ainsi que l'essai spécial et la méthode de calcul utilisée pour démontrer son aptitude à résister aux effets mécaniques afférents.

Močnostni transformatorji – 5. del: Kratkostična zmogljivost (IEC 60076-5:2006)

General Information

• Status: Published
• Publication Date: 08-Jun-2006
• Withdrawal Date: 31-Mar-2009
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: CLC/TC 14 - Power transformers
• Drafting Committee: IEC/TC 14 - IEC_TC_14
• Parallel Committee: IEC/TC 14 - IEC_TC_14
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 09-Jun-2006
• Completion Date: 09-Jun-2006
• Ref Project: SIST EN 60076-5:2006 - Power transformers -- Part 5: Ability to withstand short-circuit

Relations

• Replaces: EN 60076-5:2000 - Power transformers - Part 5: Ability to withstand short circuit
• Effective Date: 29-Jan-2023

Overview

EN 60076-5:2006 (IEC 60076-5:2006) - "Power transformers - Part 5: Ability to withstand short-circuit" specifies requirements and methods to ensure power transformers can sustain the effects of external short-circuit overcurrents without mechanical or thermal damage. Issued by CENELEC in 2006 (superseding EN 60076-5:2000), the standard combines calculation procedures, special test methods and a theoretical evaluation approach to demonstrate both the thermal and dynamic withstand capability of transformers.

Key Topics and Requirements

• Scope: Defines how to assess transformer resistance to overcurrents produced by external short circuits.
• Thermal capability: Describes calculation procedures to demonstrate that windings and insulation can tolerate the heating from short-circuit currents.
• Dynamic effects: Specifies both a special short-circuit test and an informative theoretical evaluation (Annex A) to demonstrate mechanical stability against electrodynamic forces during faults.
• “Similar transformer” guidance: Includes informative definitions and criteria for identifying equivalent transformer designs (Annex B).
• Compliance framework: Cross-references other IEC/EN 60076 parts (e.g., Part 1 general requirements, Part 3 dielectric tests) and lists normative references required for a complete assessment (see Annex ZA).

Practical Applications

• Transformer design and specification: Manufacturers use the standard to size conductors, structural supports and insulation to meet short-circuit withstand requirements.
• Type and routine testing: Test laboratories and manufacturers perform the prescribed special short-circuit test or validated theoretical evaluations to certify products.
• Purchase and acceptance criteria: Utilities and procurement teams reference EN 60076-5 in technical specifications to ensure transformers meet safety and reliability targets under fault conditions.
• System studies and protection coordination: Protection engineers use the standard’s methods to verify that transformer designs can survive anticipated fault currents in a given network.
• Regulatory and compliance checks: Compliance officers and certification bodies apply the standard when assessing conformance with European electrotechnical norms.

Related Standards

• EN/IEC 60076 series (notably Part 1: General, Part 3: Insulation levels, dielectric tests, and Part 11: Dry‑type transformers) - essential cross-references for full transformer specification and testing.
• Annex ZA in EN 60076-5 provides the normative linkages to referenced international publications.

Keywords: EN 60076-5, IEC 60076-5, power transformer short-circuit, short-circuit withstand, transformer testing, thermal capability, dynamic effects, transformer design, CENELEC.

Standards Content (Sample)

SLOVENSKI SIST EN 60076-5:2006

STANDARD
oct 2006
Močnostni transformatorji – 5. del: Kratkostična zmogljivost (IEC 60076-
5:2006)
Power transformers – Part 5: Ability to withstand short-circuit (IEC 60076-5:2006)
ICS 29.180 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD
EN 60076-5
NORME EUROPÉENNE
June 2006
EUROPÄISCHE NORM
ICS 29.180 Supersedes EN 60076-5:2000

English version
Power transformers
Part 5: Ability to withstand short-circuit
(IEC 60076-5:2006)
Transformateurs de puissance Leistungstransformatoren
Partie 5: Tenue au court-circuit Teil 5: Kurzschlussfestigkeit
(CEI 60076-5:2006) (IEC 60076-5:2006)

This European Standard was approved by CENELEC on 2006-04-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60076-5:2006 E
Foreword
The text of document 14/518/FDIS, future editio
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