EN 60076-3:2001
(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
EN following parallel vote * Supersedes HD 398.3 S1:1986
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
Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in air (IEC 60076-3:2000 + Corrigendum 2000)
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Standards Content (Sample)
SLOVENSKI SIST EN 60076-3:2002
prva izdaja
STANDARD
oktober 2002
Power transformers - Part 3: Insulation levels, dielectric tests and external
clearances in air (IEC 60076-3:2000 + Corrigendum 2000)
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 60076-3
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2001
ICS 29.180 Supersedes HD 398.3 S1:1986 + A1:1995
English version
Power transformers
Part 3: Insulation levels, dielectric tests and external clearances in air
(IEC 60076-3:2000 + corrigendum 2000)
Transformateurs de puissance Leistungstransformatoren
Partie 3: Niveaux d'isolement, essais Teil 3: Isolationspegel, Spannungs-
diélectriques et distances d'isolement prüfungen und äußere Abstände in Luft
dans l'air (IEC 60076-3:2000 + corrigendum 2000)
(CEI 60076-3:2000 + corrigendum 2000)
This European Standard was approved by CENELEC on 2001-01-01. 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and 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
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60076-3:2001 E
Foreword
The text of document 14/347/FDIS, future edition 2 of IEC 60076-3, prepared by IEC TC 14, Power
transformers, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 60076-3 on 2001-01-01.
This European Standard supersedes HD 398.3 S1:1986 + A1:1995.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2001-10-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-01-01
Annexes designated "normative" are part of the body of the standard. Annexes designated
"informative" are given for information only. In this standard, annexes D, ZA and ZB are normative and
annexes A, B and C are informative.
Annexes ZA and ZB have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60076-3:2000 + corrigendum December 2000 was approved
by CENELEC as a European Standard with the following editorial modification.
In subclause 12.3, delete note 3.
__________
- 3 - EN 60076-3:2001
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
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
)
1)
IEC 60060-1 High-voltage test techniques HD 588.1 S1 1991
Part 1: General definitions and test
requirements
2)
1)
IEC 60060-2 Part 2: Measuring systems EN 60060-2 1994
+ A11 1998
IEC 60071-1 1993 Insulation co-ordination EN 60071-1 1995
Part 1: Definitions, principles and rules
)
IEC 60071-2 1976 Part 2: Application guide HD 540.2 S1 1991
2)
1)
IEC 60076-1 Power transformers EN 60076-1 1997
(mod) Part 1: General
IEC 60137 1995 Insulated bushings for alternating EN 60137 1996
voltages above 1 kV
2)
1)
IEC 60270 High-voltage test techniques - Partial EN 60270 2001
discharge measurements
1)
IEC 60722 Guide to the lightning impulse and--
switching impulse testing of power
transformers and reactors
1) 2)
IEC 60790 Oscilloscopes and peak voltmeters for HD 479 S1 1986
impulse tests
)
Undated reference
)
Valid edition at date of issue
)
HD 540.2 S1 is superseded by EN 60071-2:1997, which is based on IEC 60071-2:1996.
Publication Year Title EN/HD Year
2)
1)
IEC 61083-1 Digital recorders for measurements in EN 61083-1 1993
(mod) high-voltage impulse tests
Part 1: Requirements for digital
recorders
2)
1)
IEC 61083-2 Part 2: Evaluation of software used for EN 61083-2 1997
the determination of the parameters of
impulse waveforms
CISPR 16-1 1993 Specification for radio disturbance and--
immunity measuring apparatus and
methods
Part 1: Radio disturbance and immunity
measuring apparatus
____________
Annex ZB
(normative)
Special national conditions
Special national condition: National characteristic or practice that cannot be changed even over a long
period, e.g. climatic conditions, electrical earthing conditions. If it affects harmonization, it forms part of
the European Standard or Harmonization Document.
For the countries in which the relevant special national apply these provisions are normative, for other
countries they are informative.
Clause Special national condition
12.3 France
Partial discharge measurements during short-duration a.c. test on non-uniform insulated
high-voltage windings are not acceptable.
____________
INTERNATIONAL IEC
STANDARD 60076-3
Second edition
2000-03
Power transformers –
Part 3:
Insulation levels, dielectric tests and
external clearances in air
© IEC 2000 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
XA
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International Electrotechnical Commission
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60076-3 © IEC:2000 – 3 –
CONTENTS
Page
FOREWORD . 7
INTRODUCTION . 11
Clause
1 Scope . 13
2 Normative references . 13
3 Definitions. 15
4 General. 15
5 Highest voltage for equipment and insulation level. 17
6 Rules for some particular transformers . 21
7 Insulation requirements and dielectric tests – Basic rules. 23
7.1 General. 23
7.2 Insulation requirements . 25
7.3 Dielectric tests . 29
7.4 Insulation requirements and tests for the neutral terminal of a winding. 33
8 Tests on a transformer having a tapped winding . 35
9 Repeated dielectric tests . 37
10 Insulation of auxiliary wiring. 37
11 Separate source AC withstand voltage test . 37
12 Induced AC voltage tests (ACSD, ACLD) . 39
12.1 General. 39
12.2 Short-duration induced AC withstand voltage test (ACSD) for transformers
with uniformly insulated high-voltage windings . 39
12.3 Short-duration AC withstand voltage test (ACSD) for transformers with
non-uniformly insulated high-voltage windings . 45
12.4 Long-duration induced AC voltage test (ACLD) with non-uniformly and/or
uniformly insulated high-voltage windings, according to table 1 . 49
13 Lightning impulse (LI) test . 55
13.1 General. 55
13.2 Test sequence . 57
13.3 Test connections. 57
13.4 Records of test. 61
13.5 Test criteria. 61
14 Test with lightning impulse chopped on the tail (LIC). 61
14.1 General. 61
14.2 Chopping gap and characteristics of the chopping . 63
14.3 Test sequence and test criteria. 63
60076-3 © IEC:2000 – 5 –
Clause Page
15 Switching impulse test (SI) . 63
15.1 General. 63
15.2 Test sequence and records . 65
15.3 Test connections. 65
15.4 Test criteria. 67
16 External clearances in air . 67
16.1 General. 67
16.2 Bushing clearance requirements as determined by transformer insulation
withstand voltages. 69
Annex A (Informative) Application guide for partial discharge measurements during
induced a.c. withstand voltage test on transformers according to 12.2, 12.3 and 12.4 . 85
Annex B (informative) Overvoltage transferred from the high-voltage winding to
a low-voltage winding. . 99
Annex C (informative) Information on transformer insulation and dielectric tests
to be supplied with an enquiry and with an order . 103
Annex D (normative) ACSD . 105
60076-3 © IEC:2000 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER TRANSFORMERS –
Part 3: Insulation levels, dielectric tests and
external clearances in air
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects sin
...
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