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PORCELAIN INSULATOR|BS EN 60168:1995 IEC 60168:1994(1)

BRITISH STANDARD|BS EN 60168:1995 IEC 60168:1994(1)

Tests on indoor and
outdoor post insulators
of ceramic material or
glass for systems with
nominal voltages
greater than 1 kV

The European Standard EN 60168:1994, with the incorporation of
amendments A1:1997 and A2:2000, has the status of a British Standard
ICS 29.080.10

Committees responsible for this
British Standard
The preparation of this British Standard was entrusted to Technical
Committee PEL/36, Insulators for power systems, upon which the following
bodies were represented:
Association of Consulting Engineers
BEAMA Electrical Cable and Conductor Accessory Manufacturers’ Association
British Industrial Ceramic Manufacturers’ Association
British Railways Board
Electrical and Electronic Insulation Association (BEAMA Ltd.)
Electricity Association
Overhead Transmission Line Contractors (BEAMA Ltd.)
Transmission and Distribution Association (BEAMA Ltd.)

This British Standard, having
been prepared under the
direction of the
Electrotechnical Sector Board,
was published under the
authority of the Standards
Board and comes into effect on
15 June 1995
© BSI 06-2001
The following BSI references
relate to the work on this
standard:
Committee reference PEL/36
Draft for comment 92/29485 DC
ISBN 0 580 24303 6

National foreword
This British Standard has been prepared by technical committee PEL/36 and is
the English Language version of EN 60168:1994 Tests on indoor and outdoor post
insulators of ceramic material or glass for systems with nominal voltages greater
than 1 kV, including amendments A1:1997 and A2:2000, published by the
European Committee for Electrotechnical Standardization (CENELEC). It is
identical with IEC 60168:1994 including amendments 1:1997 and 2:2000
published by the International Electrotechnical Commission (IEC).
This British Standard supersedes BS 3297-1:1982 which will be withdrawn
on 1 December 1995. BS 3297-2 which is identical to IEC 60273 Characteristics
of indoor and outdoor post insulators for systems greater than 1 000 V
(implementation of CENELEC HD 578 S1:1992) remains current.
Cross-references
The British Standards which implement international or European publications
referred to in this document may be found in the BSI Standards Catalogue under
the section entitled “International Standards Correspondence Index”, or by using
the “Find” facility of the BSI Standards Electronic Catalogue.
Additional information
The graphic signs, symbols and letters used in this standard may be found in the
following British Standards:
BS 3939, Graphic symbols for electrical power, telecommunications and
electronics diagrams.
Part 1:1986: General information, general index;
Part 2:1985: Symbol elements, qualifying symbols and other symbols having
general application.
A British Standard does not purport to include all the necessary provisions of a
contract. Users of British Standards are responsible for their correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, pages i and ii,
the EN title page, pages 2 to 42, an inside back cover and a back cover.
The BSI copyright notice displayed in this document indicates when the
document was last issued.
Sidelining in this document indicates the most recent changes by amendment.
 
English version
Tests on indoor and outdoor post insulators of ceramic
material or glass for systems with nominal voltages
greater than 1 kV
(includes amendments A1:1997 and A2:2000 )
(IEC 60168:1994 + A1:1997 + A2:2000)
Essais des supports isolants d’intérieur et
d’extérieur, en matière céramique ou en
verre, destinés à des installations de tension
nominale supérieure à 1 kV
(inclut les amendements A1:1997 et A2:2000)
(CEI 60168:1994 + A1:1997 + A2:2000)
Prüfungen an Innenraum- und
Freiluft-Stützisolatoren aus keramischem
Werkstoff oder Glas für Systeme mit
Nennspannungen über 1 kV
(enthält Änderungen A1:1997 und A2:2000)
(IEC 60168:1994 + A1:1997 + A2:2000)
This European Standard was approved by CENELEC on 1994-12-06.
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, 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
© 1994
Foreword
The text of document 36C(CO)58, future edition 4 of
IEC 168, prepared by SC 36C, Insulators for
substations, of IEC TC 36, Insulators, was
submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 60168
on 1994-12-06.
The following dates were fixed:
Annexes designated “normative” are part of the
body of the standard. Annexes designated
“informative” are given for information only. In this
standard, Annex ZA is normative and Annex A,
Annex B and Annex C are informative. Annex ZA
has been added by CENELEC.
Foreword to amendment A1
The text of document 36C/81/FDIS, future
amendment 1 to IEC 60168:1994, prepared by
SC 36C, Insulators for substations, of IEC TC 36,
Insulators, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as
amendment A1 to EN 60168:1994 on 1997-07-01.

The following dates were fixed:
Foreword to amendment A2
The text of document 36C/121/FDIS, future
amendment 2 to IEC 60168:1994, prepared by
SC 36C, Insulators for substations, of IEC TC 36,
Insulators, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as
amendment A2 to EN 60168:1994 on 2000-11-01.
The following dates were fixed:
Contents
Page
Foreword 2
Introduction 3
Section 1. General
1.1 Scope and object 5
1.2 Normative references 5
1.3 Definitions 6
Section 2. Insulators
2.1 Insulator designs and insulating
materials 9
2.2 Values which characterize a post
insulator 9
2.3 Identification of insulators 10
Section 3. Classification of the tests,
sampling rules and procedures
3.1 Classification of the tests 11
3.2 Quality assurance 11
3.3 General requirements for type tests 11
3.4 General requirements for sample tests 13
Section 4. Test procedures for electrical tests
4.1 General requirements for high-voltage
tests 15
4.2 Standard atmospheric conditions and
correction factors for electrical tests 15
4.3 Artificial rain parameters for wet tests 15
4.4 Mounting arrangements for electrical
tests 15
4.5 Dry lightning-impulse withstand
voltage test — Type test 17
4.6 Dry or wet switching-impulse
withstand voltage tests — Type test 17
— latest date by which the
EN has to be implemented
at national level by
publication of an identical
national standard or by
endorsement (dop) 1995-12-01
— latest date by which the
national standards
conflicting with the EN
have to be withdrawn (dow) 1995-12-01
— latest date by which the
amendment has to be
implemented at national
level by publication of an
identical national standard
or by endorsement (dop) 1998-04-01
— latest date by which the
national standards
conflicting with the
amendment have to be
withdrawn (dow) 1998-04-01
— latest date by which the
amendment has to be
implemented at national
level by publication of an
identical national standard
or by endorsement (dop) 2001-08-01
— latest date by which the
national standards
conflicting with the
amendment have to be
withdrawn (dow) 2003-11-01
Page
4.7 Dry power-frequency withstand
voltage test — Type test (applicable
only to post insulators for indoor use) 18
4.8 Wet power-frequency withstand voltage
test — Type test (applicable only to
post insulators for outdoor use) 18
4.9 Puncture test — Sample test 19
4.10 Routine electrical test 19
Section 5. Test procedures for mechanical
and other tests
5.1 Verification of the dimensions — Type
and sample test 21
5.2 Mechanical failing load test — Type
and sample test 22
5.3 Test for deflection under load —
Special type test 24
5.4 Temperature cycle test — Sample test 24
5.5 Routine thermal shock test
(applicable only to toughened
glass insulating parts) 25
5.6 Porosity test — Sample test
(applicable only to ceramic
post insulators) 25
5.7 Galvanizing test — Sample test 25
5.8 Routine visual inspection 26
5.9 Routine mechanical test 27
Section 6. Tests applicable to post insulators
6.1 Type tests 29
6.2 Sample tests 29
6.3 Routine tests 29
6.4 Summary of tests on post insulators 30
Annex A (informative) Methods of testing
for tolerances of parallelism, eccentricity,
angular deviation, camber and shed angle of
post insulators 35
Annex B (informative) Methods of routine
testing of unassembled insulator units 38
Annex C (informative) Bibliography 41
Annex ZA (normative) Other international
publications quoted in this standard with
the references of the relevant European
publications 42
Figure 1 — Solid core cylindrical post insulator 32
Figure 2 — Cavity core cylindrical post
insulator 33
Figure 3 — Cylindrical post insulator with
internal metal fittings 33
Figure 4 — Cylindrical post insulator with
internal metal fittings 34
Figure 5 — Pedestal post insulator 34
Figure 6 — Cylindrical post insulator 34
Page
Figure A.1 35
Figure A.2 36
Figure A.3 36
Figure A.4 37
Figure A.5 37
Figure B.1 38
Figure B.2 39
Figure B.3 40
Table 1 — Number of samples for sample tests 13
Table 2 — Mounting height of outdoor post
insulators 16
Table 3 — Type tests applicable to post
insulators 30
Table 4 — Sample tests applicable to post
insulators 30
Table 5 — Routine tests applicable to post
insulators 31
Introduction
The main purpose in preparing this edition has been
to align the text and presentation as far as
practicable with the fourth edition of IEC 383-1 and
IEC 383-2.
Concepts of electrical and mechanical equivalence of
post insulators have been introduced, and the
clauses dealing with mechanical testing have been
redrafted to clarify the test requirements.

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Section 1. General.....to be continued

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