EN 60664-4:2006

SLOVENSKI STANDARD
01-januar-2007
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Insulation coordination for equipment within low-voltage systems -- Part 4: Consideration
of high-frequency voltage stress
Isolationskoordination für elektrische Betriebsmittel in Niederspannungsanlagen -- Teil 4:
Berücksichtigung von hochfrequenten Spannungsbeanspruchungen
Coordination de l'isolement des matériels dans les systèmes (réseaux) à basse tension -
- Partie 4: Considérations sur les contraintes de tension à haute fréquence
Ta slovenski standard je istoveten z: EN 60664-4:2006
ICS:
29.080.30 Izolacijski sistemi Insulation systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60664-4
NORME EUROPÉENNE
January 2006
EUROPÄISCHE NORM
ICS 29.080.30 Incorporates Corrigendum October 2006

English version
Insulation coordination for equipment within low-voltage systems
Part 4: Consideration of high-frequency voltage stress
(IEC 60664-4:2005)
Coordination de l'isolement des matériels Isolationskoordination für elektrische
dans les systèmes (réseaux) Betriebsmittel in Niederspannungsanlagen
à basse tension Teil 4: Berücksichtigung von
Partie 4: Considérations hochfrequenten
sur les contraintes de tension Spannungsbeanspruchungen
à haute fréquence (IEC 60664-4:2005)
(CEI 60664-4:2005)
This European Standard was approved by CENELEC on 2005-10-01. 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, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, 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

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60664-4:2006 E
Foreword
The text of document 109/51/FDIS, future edition 2 of IEC 60664-4, prepared by IEC TC 109, Insulation
co-ordination for low-voltage equipment, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60664-4 on 2005-10-01.
This European Standard is to be used in conjunction with EN 60664-1 or EN 60664-5.
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) 2006-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-10-01
Annex ZA has been added by CENELEC.
The contents of the corrigendum of October 2006 have been included in this copy.
__________
Endorsement notice
The text of the International Standard IEC 60664-4:2005 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60664-4:2006
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. 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 60112 2003 Method for the determination of the proof and EN 60112 2003
the comparative tracking indices of solid
insulating materials
IEC 60664-1 (mod) 1992 Insulation coordination for equipment within
+ A1 2000 low-voltage systems
+ A2 2002 Part 1: Principles, requirements and tests EN 60664-1 2003

IEC 60664-5 2003 Insulation coordination for equipment within EN 60664-5 2003
low-voltage systems
Part 5: A comprehensive method for
determining clearances and creepage
distances equal to or less than 2 mm

IEC Guide 104 1997 The preparation of safety publications and the - -
use of basic safety publications and group
safety publications
NORME CEI
INTERNATIONALE
IEC
60664-4
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2005-09
PUBLICATION FONDAMENTALE DE SÉCURITÉ
BASIC SAFETY PUBLICATION
Coordination de l'isolement des matériels
dans les systèmes (réseaux) à basse tension –
Partie 4:
Considérations sur les contraintes
de tension à haute fréquence
Insulation coordination for equipment
within low-voltage systems –
Part 4:
Consideration of high-frequency voltage stress
 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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For price, see current catalogue

60664-4  IEC:2005 – 3 –
CONTENTS
FOREWORD.9
INTRODUCTION.13
1 Scope and object.15
2 Normative references .17
3 Terms and definitions .17
4 Clearances .19
4.1 General conditions .19
4.2 Basic information.19
4.3 Homogeneous and approximately homogeneous fields.19
4.4 Inhomogeneous fields .21
5 Creepage distances.27
5.1 Experimental data .27
5.2 Dimensioning of creepage distances .27
6 Solid insulation.33
6.1 General consideration .33
6.2 Influencing factors .33
6.3 Dimensioning of solid insulation .35
7 High-frequency testing.37
7.1 Basic requirements.37
7.2 Test voltage source .39
7.3 Conditioning .39
7.4 High-frequency breakdown test .39
7.5 High-frequency partial discharge test .39
7.6 Examples of test results .45
8 Non sinusoidal voltages.45
8.1 General considerations.45
8.2 Periodic impulse voltage.47
8.3 Harmonic analysis .47
8.4 Dimensioning procedure and testing.47

Annex A (informative) Insulation characteristics of clearances at high-frequency
voltages.51
Annex B (informative) Insulation characteristics of creepage distances at high-
frequency voltages.65
Annex C (informative) Insulation characteristics of solid insulation at high-frequency
voltages.71
Annex D (normative) Testing of insulation at high-frequency voltages.91
Annex E (informative) Insulation stressed with non-sinusoidal high-frequency voltages .119
Annex F (informative) Dimensioning diagrams .129

Bibliography.133

60664-4  IEC:2005 – 5 –
Figure 1 – Dimensioning of inhomogeneous clearances in air at atmospheric pressure
(point-plane-electrodes, 5 µm radius) to avoid PD (clearance ≥ 1 mm) or breakdown
(clearance < 1 mm) .25
Figure 2 – Dimensioning of creepage distances to avoid partial discharge (creepage
distance ≥ 1 mm) or breakdown (creepage distance < 1 mm) .31
Figure 3 – Permissible field strength for dimensioning of solid insulation according to
Equation (3).37
Figure 4 – Periodic impulse voltage (see Part 1) .47
Figure A.1 – Breakdown at high frequency in air at atmospheric pressure,
homogeneous field, frequency range 50 Hz – 25 MHz [3].53
Figure A.2 – Breakdown at high frequency in air at atmospheric pressure,
homogeneous field, frequency range 50 Hz – 2,5 MHz [4].55
Figure A.3 – Needle tip after (upper) and before (lower) breakdown.57
Figure A.4 – PD inception voltages in air at atmospheric pressure for f = 100 kHz,
point-plane electrodes with different point radius [6] .59
Figure A.5 – PD extinction voltages and breakdown voltages in air at atmospheric
pressure for f = 460 kHz, point-plane electrodes with BB-needles [6] .61
Figure A.6 – PD extinction voltages and breakdown voltages in air at atmospheric
pressure for f = 1 MHz, point-plane electrodes with BB-needles [6].63
Figure B.1 – Test specimen for measuring the PD voltages and the withstand voltages
of creepage distances up to 6,3 mm .65
Figure B.2 – Test results of the PD extinction voltage U of creepage distances up to
e
6,3 mm [6] .69
Figure B.3 – Test results of the breakdown voltage U of creepage distances up to
b
6,3 mm [6] .69
Figure C.1 – PD withstand capability of coatings; constant test voltage U (f = 50 Hz)
t
[12] 73
Figure C.2 – PD withstand capability of coatings; linearly increasing test voltage U (f =
t
50 Hz) [12].73
Figure
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