EN 60660:1999

SLOVENSKI STANDARD
01-februar-2001
Insulators - Tests on indor post insulators of organic material for systems with
nominal voltages greater than 1 kV up to but not including 300 kV (IEC 60660:1999)
Insulators - Tests on indoor post insulators of organic material for systems with nominal
voltages greater than 1 kV up to but not including 300 kV
Isolatoren - Prüfungen an Innenraum-Stützern aus organischem Werkstoff für Netze mit
Nennspannungen über 1 kV bis kleiner 300 kV
Isolateurs - Essais des supports isolants d'intérieur en matière organique destinés à des
installations de tension nominale supérieure à 1 kV jusqu'à 300 kV non compris
Ta slovenski standard je istoveten z: EN 60660:1999
ICS:
29.080.10 Izolatorji Insulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1999-10
Isolateurs –
Essais des supports isolants d'intérieur en matière
organique destinés à des installations de tension
nominale supérieure à 1 000 V jusqu'à 300 kV
non compris
Insulators –
Tests on indoor post insulators of organic material
for systems with nominal voltages greater than
1 000 V up to but not including 300 kV
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60660 © IEC:1999 – 3 –
CONTENTS
Page
FOREWORD . 5
Clause
1 General. 9
1.1 Scope and object . 9
1.2 Normative references. 9
1.3 Definitions. 11
1.4 Values which characterise a post insulator of organic material. 15
1.5 Documentation. 17
1.6 Normal service conditions . 17
2 General requirements for tests . 17
2.1 Classification of tests . 17
2.2 Quality assurance . 19
2.3 General requirements for electrical tests . 19
2.4 Lightning impulse voltage tests. 21
2.5 Power-frequency voltage tests. 21
2.6 Standard reference atmospheric conditions for tests. 21
2.7 Correction factors for atmospheric conditions . 21
3 Type tests . 21
3.1 General. 21
3.2 General requirements for electrical type tests . 25
3.3 Dry lightning impulse withstand voltage test. 27
3.4 Dry power-frequency withstand voltage test . 29
3.5 Partial discharge extinction voltage test. 29
3.6 Lightning impulse puncture test . 29
3.7 Mechanical failing load test . 31
3.8 Test for deflection under load at normal ambient temperature conditions . 33
3.9 Test for mechanical bending strength as a function of temperature . 33
3.10 Water absorption test. 37
3.11 Ageing and humidity test . 37
3.12 Flammability test. 37
3.13 Temperature cycle test. 37
4 Sample tests . 39
4.1 General. 39
4.2 Verification of dimensions . 41
4.3 Re-test procedure . 41
5 Routine tests.43
5.1 General. 43
5.2 Visual examination . 43
5.3 Mechanical routine test . 43
5.4 Electrical routine test and partial discharge measurement. 45
Annex A (informative) Tolerances of form and position. 47

60660 © IEC:1999 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATORS – TESTS ON INDOOR POST INSULATORS OF
ORGANIC MATERIAL FOR SYSTEMS WITH NOMINAL
VOLTAGES GREATER THAN 1 000 V UP TO BUT
NOT INCLUDING 300 kV
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 since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60660 has been prepared by subcommittee 36C: Insulators for
substations, of IEC technical committee 36: Insulators.
This second edition cancels and replaces the first edition published in 1979 and constitutes a
technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
36C/111/FDIS 36C/114/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annex A is for information only.

60660 © IEC:1999 – 7 –
The committee has decided that this publication remains valid until 2006.
At this date, in accordance with the committee’s decision, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
60660 © IEC:1999 – 9 –
INSULATORS – TESTS ON INDOOR POST INSULATORS OF
ORGANIC MATERIAL FOR SYSTEMS WITH NOMINAL
VOLTAGES GREATER THAN 1 000 V UP TO BUT
NOT INCLUDING 300 kV
1 General
1.1 Scope and object
This International Standard is applicable to post insulators of organic material for indoor
service in electrical installations or equipment operating in air at atmospheric pressure on
alternating current with a nominal voltage greater than 1 000 V up to, but not including, 300 kV,
as defined by range I of IEC 60071-1, and a frequency not greater than 100 Hz. Composite
insulators are not covered by this standard.
The object of this standard is
– to define the terms used;
– to define electrical and mechanical characteristics of post insulators of organic material
and to prescribe the conditions under which the specified values of these characteristics
are verified;
– to prescribe methods of testing;
– to prescribe acceptance criteria.
This standard does not give numerical values for insulator characteristics; nor does it deal with
a choice of insulators for specific operating conditions. IEC 60273 specifies numerical values
for electrical and mechanical characteristics and gives the dimensions necessary for inter-
changeability of post insulators.
1.2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of the ISO/IEC Directives. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this part of the ISO/IEC Directives are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below.
For undated references, the latest edition of the normative document referred to applies.
Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 60050(471):1984, International Electrotechnical Vocabulary (IEV) – Chapter 471:
Insulators
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60071-1, Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 60270, Partial discharge measurements
IEC 60273, Characteristics of indoor and outdoor post insulators for systems with nominal
voltages greater than 1 000 V
IEC 60587, Test method for evaluating resistance to tracking and erosion of electrical
insulating materials used under severe ambient conditions

60660 © IEC:1999 – 11 –
IEC 60695-11-10:1999, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
IEC 60932, Additional requirements for enclosed switchgear and controlgear from 1 kV
to 72,5 kV to be used in severe climatic conditions
ISO 9000-1, Quality management and quality assurance standards – Part 1: Guidelines for
selection and use
ISO 9002, Quality systems – Model for quality assurance in production, installation and
servicing
1.3 Definitions
For the purpose of this standard, the following definitions apply, together with those in
IEC 60050(471)
NOTE – The definitions regarding test voltages are given for convenience. For additional details, see IEC 60060-1.
1.3.1
post insulator of organic material
post insulator intended to give rigid support to a live part which is to be insulated from earth
and from another live part. The whole or part of the material composing the post insulator
consists of organic materials, i.e. of material pertaining to the chemistry of the compounds
produced from carbon or to the chemistry of the compounds produced from carbon and silicon.
These organic materials may be used alone or in conjunction with other materials (mineral or
organic) as fillers, reinforcements, etc.
1.3.2
indoor post insulator
a post insulator not intended to be exposed to outdoor atmospheric conditions. For indoor
installations subject to excessive condensation, outdoor post insulators or special indoor post
insulators may be used
[IEV 471-04-04, modified]
1.3.3
design category
post insulators of organic materials are divided into two different design categories according
to their construction. The design categories covered by this standard are:
Design category A
Cylindrical post insulators with internal metal fittings in which the length of the shortest
puncture path through solid insulating material is equal to or greater than one-third th
...