EN 60076-3:2013
(Main)Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in air
Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in air
IEC 60076-3:2013 specifies the insulation requirements and the corresponding insulation tests with reference to specific windings and their terminals. This International Standard applies to power transformers as defined by IEC 60076-1. It also recommends external clearances in air. It gives details of the applicable dielectric tests and minimum dielectric test levels. Recommended minimum external clearances in air between live parts and between live parts and earth are given for use when these clearances are not specified by the purchaser. For categories of power transformers and reactors which have their own IEC standards, this standard is applicable only to the extent in which it is specifically called up by cross reference in the other standards. This third edition of IEC 60076-3 cancels and replaces the second edition published in 2000, and constitutes a technical revision. The main changes from the previous edition are as follows: - Three categories of transformer are clearly identified together with the relevant test requirements, these are summarised in Table 1. - Switching impulse levels are defined for values of Um > 72,5 kV. - The procedure for Induced voltage tests with PD has been revised to ensure adequate phase to phase test voltages. - The AC withstand test has been redefined (LTAC instead of ACSD). - Induced voltage tests are now based on Ur rather than Um. - New requirements for impulse waveshape (k factor) have been introduced. - Tables of test levels have been merged and aligned with IEC 60071-1:2010. - Additional test levels have been introduced for Um > 800 kV. - A new Annex E has been introduced, which sets out the principles used in assigning the tests, test levels and clearances in air.
Leistungstransformatoren - Teil 3: Isolationspegel, Spannungsprüfungen und äußere Abstände in Luft
Transformateurs de puissance - Partie 3: Niveaux d'isolement, essais diélectriques et distances d'isolement dans l'air
La CEI 60076-3:2013 spécifie les exigences d'isolement et d'essais diélectriques correspondants en faisant référence aux enroulements spécifiques et à leurs bornes. La présente Norme internationale s'applique aux transformateurs de puissance définis dans le domaine d'application de la CEI 60076-1. Elle recommande également les distances d'isolement dans l'air. Elle fournit les détails des essais diélectriques et des niveaux d'essai diélectriques minimum applicables. Des distances d'isolement dans l'air minimales recommandées entre les parties sous tension et entre ces dernières et la terre sont précisées pour être utilisées lorsque ces distances dans l'air ne sont pas spécifiées par l'acheteur. Pour les catégories de transformateurs de puissance et de bobines d'inductance qui disposent d'une norme CEI qui leur est propre, la présente norme est applicable uniquement dans la mesure où il y est fait explicitement référence dans les autres normes. Cette troisième édition de la CEI 60076-3 annule et remplace la deuxième édition parue en 2000, dont elle constitue une révision technique. Les modifications principales par rapport à l'édition antérieure sont les suivantes: - Trois catégories de transformateurs sont clairement identifiées ainsi que les exigences d'essais correspondantes, elles sont résumées dans le Tableau 1. - Les niveaux de tenue au choc de manoeuvre sont définis pour toutes les valeurs de Um > 72,5 kV. - La procédure d'essais de tension induite avec PD a été révisée pour garantir des tensions d'essais entre phase adéquates. - L'essai de tenue en tension alternative a été redéfini (LTAC à la place de ACSD). - Les niveaux d'essais de tenue en tension induite sont à présent fondés sur Ur plutôt que sur Um. - De nouvelles exigences relatives à la forme de l'onde de choc (facteur k) ont été introduites. - Les tableaux des niveaux d'essai ont été fusionnés et leurs valeurs alignés sur celles de la CEI 60071-1:2010. - Des niveaux d'essai supplémentaires ont été introduits pour Um > 800 kV. - Une nouvelle Annexe E a été introduite, qui fixe certains des principes utilisés pour le choix des essais, des niveaux d'essai et des distances d'isolement dans l'air.
Močnostni transformatorji - 3. del: Izolacijski nivoji, dielektrični preskusi in zunanje zračne razdalje
Ta mednarodni standard se uporablja za močnostne transformatorje, ki so opredeljeni v standardu IEC 60076-1 in spadajo na njegovo področje uporabe. Vsebuje podrobnosti glede ustreznih dielektričnih preskusov in minimalnih nivojev dielektričnih preskusov. Priporočljive minimalne zunanje zračne razdalje med deli pod napetostjo ter med deli pod napetostjo in ozemljitvijo so navedene za uporabo, kadar dobavitelj ne navede teh razdalj. Pri kategorijah močnostnih transformatorjev in reaktorjev, ki imajo svoje standarde IEC, se ta standard uporablja samo v obsegu, v katerem se specifično sklicuje nanj s primerjavo v drugih standardih.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2014
1DGRPHãþD
SIST EN 60076-3:2002
0RþQRVWQLWUDQVIRUPDWRUMLGHO ,]RODFLMVNLQLYRMLGLHOHNWULþQLSUHVNXVLLQ
]XQDQMH]UDþQHUD]GDOMH
Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in
air
Leistungstransformatoren - Teil 3: Isolationspegel, Spannungsprüfungen und äußere
Abstände in Luft
Transformateurs de puissance - Partie 3: Niveaux d'isolement, essais diélectriques et
distances d'isolement dans l'air
Ta slovenski standard je istoveten z: EN 60076-3:2013
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 60076-3
NORME EUROPÉENNE
November 2013
EUROPÄISCHE NORM
ICS 29.180 Supersedes EN 60076-3:2001
English version
Power transformers -
Part 3: Insulation levels, dielectric tests and external clearances in air
(IEC 60076-3:2013)
Transformateurs de puissance - Leistungstransformatoren -
Partie 3: Niveaux d'isolement, essais Teil 3: Isolationspegel,
diélectriques et distances d'isolement Spannungsprüfungen und äußere
dans l'air Abstände in Luft
(CEI 60076-3:2013) (IEC 60076-3:2013)
This European Standard was approved by CENELEC on 2013-09-04. 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, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60076-3:2013 E
Foreword
The text of document 14/745/FDIS, future edition 3 of IEC 60076-3, prepared by IEC/TC 14 "Power
transformers" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
(dop) 2014-06-04
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2016-09-04
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60076-3:2001.
EN 60073-3:2001:
– Three categories of transformer are clearly identified together with the relevant test requirements,
these are summarised in Table 1.
– Switching impulse levels are defined for all Um>72,5kV.
– The procedure for Induced voltage tests with PD has been revised to ensure adequate phase to
phase test voltages.
– The AC withstand test has been redefined (LTAC instead of ACSD).
– Induced voltage tests are now based on Ur rather than Um.
– New requirements for impulse waveshape (k factor) have been introduced.
– Tables of test levels have been merged and aligned with IEC 60071-1:2010.
– Additional test levels have been introduced for Um > 800kV.
– A new Annex E has been introduced, which sets out the principles used in assigning the tests, test
levels and clearances in air.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60076-3:2013 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 60071-2 NOTE Harmonized as EN 60071-2.
IEC 60076-4 NOTE Harmonized as EN 60076-4.
IEC 60214-1 NOTE Harmonized as EN 60214-1.
IEC 61083-1 NOTE Harmonized as EN 61083-1.
IEC 61083-2 NOTE Harmonized as EN 61083-2.
IEC 62271-1 NOTE Harmonized as EN 62271-1.
- 3 - EN 60076-3:2013
Annex ZA
(normative)
Normative references to i nternational publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60050-421 International electrotechnical vocabulary - -
(IEV) -
Chapter 421: Power transformers and
reactors
IEC 60060-1 High-voltage test techniques – EN 60060-1
Part 1: General definitions and test
requirements
IEC 60060-2 High-voltage test techniques - EN 60060-2
Part 2: Measuring systems
IEC 60071-1 Insulation co-ordination - EN 60071-1
Part 1: Definitions, principles and rules
IEC 60076-1 Power transformers - EN 60076-1
Part 1: General
IEC 60137 Insulated bushings for alternating voltages EN 60137
above 1 000 V
IEC 60270 High-voltage test techniques - Partial EN 60270
discharge measurements
IEC 60076-3 ®
Edition 3.0 2013-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Power transformers –
Part 3: Insulation levels, dielectric tests and external clearances in air
Transformateurs de puissance –
Partie 3: Niveaux d'isolement, essais diélectriques et distances d'isolement
dans l'air
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 29.180 ISBN 978-2-83220-830-4
– 2 – 60076-3 © IEC:2013
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 General . 8
5 Highest voltage for equipment and rated insulation level . 10
6 Transformers with re-connectable windings . 11
7 Dielectric tests . 12
7.1 Overview . 12
7.2 Test requirements . 13
7.2.1 General . 13
7.2.2 Test voltage levels . 14
7.2.3 Test sequence . 17
7.3 Test requirements for specific transformers . 17
7.3.1 Tests for transformers with U ≤ 72,5 kV . 17
m
7.3.2 Tests on transformers with 72,5 kV < U ≤ 170 kV . 18
m
7.3.3 Tests on Transformers with U > 170 kV . 19
m
7.4 Assigning U and test voltages to the neutral terminal of a winding . 20
m
7.4.1 Transformers with U ≤ 72,5 kV . 20
m
7.4.2 Transformers with U > 72,5 kV . 20
m
8 Dielectric tests on transformers that have been in service . 20
9 Insulation of auxiliary wiring (AuxW) . 21
10 Applied voltage test (AV) . 21
11 Induced voltage tests (IVW and IVPD) . 22
11.1 General . 22
11.2 Induced voltage withstand test (IVW) . 22
11.3 Induced voltage test with partial discharge measurement (IVPD) . 23
11.3.1 General . 23
11.3.2 Test duration and frequency . 23
11.3.3 Test sequence . 23
11.3.4 Partial discharge (PD) measurement . 24
11.3.5 Test acceptance criteria . 25
12 Line terminal AC withstand test (LTAC) . 25
13 Lightning impulse tests (LI, LIC, LIN, LIMT) . 26
13.1 Requirements for all lightning impulse tests . 26
13.1.1 General . 26
13.1.2 Tap positions . 26
13.1.3 Records of tests . 26
13.1.4 Test connections. 27
13.2 Full wave lightning impulse test (LI) . 28
13.2.1 Wave shape, determination of test voltage value and tolerances . 28
13.2.2 Tests on transformers without non-linear elements . 29
13.2.3 Tests on transformers with non-linear elements . 30
13.3 Chopped wave lightning impulse test (LIC) . 31
60076-3 © IEC:2013 – 3 –
13.3.1 Wave shape. 31
13.3.2 Tests on transformers without non-linear elements . 31
13.3.3 Tests on transformers with non-linear elements . 32
13.4 Lightning impulse test on a neutral terminal (LIN) . 33
13.4.1 General . 33
13.4.2 Waveshape. 33
13.4.3 Test sequence . 34
13.4.4 Test criteria . 34
14 Switching impulse test (SI) . 34
14.1 General . 34
14.2 Test connections . 34
14.3 Waveshape . 35
14.4 Test sequence . 35
14.5 Test criteria .
...
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