IEC 61467:2008

IEC 61467
Edition 1.0 2008-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulators for overhead lines – Insulator strings and sets for lines with a nominal
voltage greater than 1 000 V – AC power arc tests

Isolateurs pour lignes aériennes – Chaînes d’isolateurs et chaînes d’isolateurs
équipées pour lignes de tension nominale supérieure à 1 000 V – Essais d’arc de
puissance en courant alternatif

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IEC 61467
Edition 1.0 2008-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulators for overhead lines – Insulator strings and sets for lines with a
nominal voltage greater than 1 000 V – AC power arc tests

Isolateurs pour lignes aériennes – Chaînes d’isolateurs et chaînes d’isolateurs
équipées pour lignes de tension nominale supérieure à 1 000 V – Essais d’arc
de puissance en courant alternatif

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 29.080.10; 29.240.20 ISBN 2-8318-9953-2
– 2 – 61467 © IEC:2008
CONTENTS
FOREWORD.4
1 Scope and object.6
2 Normative references .6
3 Terms and definitions .6
4 Symbols and abbreviations.7
5 Characteristics of the test current .8
6 Supply and return circuit conditions .9
7 Tests on insulator sets .11
7.1 General remarks.11
7.2 Test arrangement .11
7.3 Test current.11
7.4 Supply and return circuit conditions.11
7.5 Arc initiation .12
7.6 Ambient conditions .14
7.7 Test series and characteristics of the power arcs .14
8 Tests on short strings .14
8.1 General remark .14
8.2 Test arrangement .15
8.3 Test current.15
8.4 Supply and return circuit conditions.15
8.5 Arc initiation .15
8.6 Ambient conditions .15
8.7 Test series and characteristics of the power arcs .16
9 Test report.18
10 Evaluation of results .18
10.1 General remark .18
10.2 Visual examination .18
10.3 Porcelain or glass insulators.18
10.4 Composite insulators.19
10.5 Acceptance criteria.19
Annex A (normative) Examples of test arrangements and practical methods of tower
simulation (return circuit) .20
Annex B (normative) Determination of the r.m.s. value of the current.25
Annex C (informative) No-load voltage of the power source .27
Annex D (informative) Power arcs on insulator sets and their true simulation by
appropriate positioning of fusible wires .28
Annex E (informative) Wind velocity during power arc tests .30
Annex F (informative) Variation of the fault current magnitude and reasons for the
choice of the prescribed test parameters .31
Annex G (informative) Recommendations for the test report .33
Annex H (informative) Sample of a power arc test report .37
Bibliography.40

Figure 1 – Illustration of supply and return currents .10
Figure 2 – Arc initiation.13

61467 © IEC:2008 – 3 –
Figure 3 – Mounting arrangement for short strings .17
Figure A.1 – Test arrangement of vertical insulator set .21
Figure A.2 – Test arrangement of vertical insulator set using simplified tower steel
structure .22
Figure A.3 – Test arrangement of Vee insulator set located in the centre of the tower
(for the simplified tower steel structure and return circuit, see Figures A.1 and A.2).23
Figure A.4 – Test arrangement of horizontal insulator (for the simplified tower steel
structure and return circuit, see Figures A.1 and A.2) .24
Figure D.1 – 5 kA power arc test of a 145 kV string consisting of 7 cap and pin units.29
Figure F.1 – Distribution of arc current (I) and its supply circuit components (I , I )
S1 S2
along a 100 km long, 145 kV line connecting busbars of 28 kA short-circuit current .32

Table 1 – Supply and return conditions .9
Table 2 – Test series for insulator sets .14
Table 3 – Test series for short insulator strings.16
Table 4 – Test assessment criteria .19

– 4 – 61467 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATORS FOR OVERHEAD LINES –
INSULATOR STRINGS AND SETS FOR LINES WITH
A NOMINAL VOLTAGE GREATER THAN 1 000 V –
AC POWER ARC TESTS
FOREWORD
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