Polymeric HV insulators for indoor and outdoor use - General definitions, test methods and acceptance criteria

IEC 62217:2012 is applicable to polymeric insulators whose insulating body consists of one or various organic materials. Polymeric insulators covered by this standard include both solid core and hollow insulators. They are intended for use on HV overhead lines and in indoor and outdoor equipment. The object of this standard is:
- to define the common terms used for polymeric insulators;
- to prescribe common test methods for design tests on polymeric insulators;
- to prescribe acceptance or failure criteria, if applicable.
These tests, criteria and recommendations are intended to ensure a satisfactory life-time under normal operating and environmental conditions. This standard shall only be applied in conjunction with the relevant product standard. This second edition cancels and replaces the first edition published in 2005. This edition constitutes a technical revision. This edition includes a significant technical change with respect to the previous edition. The first edition of IEC 62217 (2005) included two other alternative tracking and erosion tests (a 5 000 hour multi-stress test and a tracking wheel test) which were based on tests developed by CIGRE and utilities. These tests are no longer given as normative alternatives following the results of a study/questionnaire by TC 36 on the relative merits of all three tracking and erosion tests. The 5 000 hour multi-stress test and a tracking wheel test are described in IEC/TR 62730 (2012).

Isolateurs polymériques à haute tension pour utilisation à l'intérieur ou à l'extérieur - Définitions générales, méthodes d'essai et critères d'acceptation

La CEI 62217:2012 est applicable aux isolateurs polymériques dont le corps isolant se compose d'un ou de divers matériaux organiques. Les isolateurs polymériques traités dans la présente norme comprennent à la fois les isolateurs à fût plein et les isolateurs creux. Ils sont destinés à être utilisés sur des lignes aériennes HT et dans les appareils pour utilisation à l'intérieur ou à l'extérieur. L'objet de la présente norme est le suivant:
- définir les termes communs utilisés pour les isolateurs polymériques;
- prescrire des méthodes d'essai communes pour les essais de conception sur les isolateurs polymériques;
- prescrire des critères d'acceptation ou de défaillance, le cas échéant.
Ces essais, critères et recommandations sont destinés à assurer une durée de vie satisfaisante dans des conditions normales de fonctionnement et d'environnement. La présente norme ne doit être appliquée que conjointement avec la norme de produit applicable. Cette deuxième édition annule et remplace la première édition publiée en 2005. Cette édition constitue une révision technique. Cette édition inclut un changement technique significatif par rapport à l'édition précédente. La première édition de la CEI 62217 (2005) incluait deux autres essais alternatifs de cheminement et d'érosion (un essai de 5 000 heures sous contraintes multiples et un essai de roue d'endurance) qui étaient basés sur des essais développés par le CIGRE et les compagnies d électricité. Ces essais ne sont plus donnés comme alternatives normatives suite aux résultats d'une étude/questionnaire du comité d'études 36 sur les mérites relatifs des trois essais de cheminement et d'érosion. L'essai de 5 000 heures sous contraintes multiples et un essai de roue d'endurance sont décrits dans le rapport technique IEC/TR 62730 (2012).

General Information

Status
Published
Publication Date
26-Sep-2012
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
27-Sep-2012
Completion Date
27-Sep-2012
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IEC 62217
Edition 2.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Polymeric HV insulators for indoor and outdoor use – General definitions, test
methods and acceptance criteria
Isolateurs polymériques à haute tension pour utilisation à l'intérieur ou à
l'extérieur – Définitions générales, méthodes d’essai et critères d’acceptation
IEC 62217:2012
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62217
Edition 2.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Polymeric HV insulators for indoor and outdoor use – General definitions, test
methods and acceptance criteria
Isolateurs polymériques à haute tension pour utilisation à l'intérieur ou à
l'extérieur – Définitions générales, méthodes d’essai et critères d’acceptation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.080.10 ISBN 978-2-83220-338-5

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 62217 © IEC:2012
CONTENTS

FOREWORD......................................................................................................................... 4

INTRODUCTION ................................................................................................................... 6

1  Scope and object ............................................................................................................ 7

2  Normative references ..................................................................................................... 7

3  Terms and definitions ..................................................................................................... 8

4  Identification ................................................................................................................. 10

5  Environmental conditions .............................................................................................. 10

6  Information on transport, storage and installation .......................................................... 11

7  Classification of tests .................................................................................................... 11

7.1  Design tests ........................................................................................................ 11

7.2  Type tests ........................................................................................................... 12

7.3  Sample tests ....................................................................................................... 12

7.4  Routine tests ....................................................................................................... 12

8  General requirements for insulator test specimens ........................................................ 12

9  Design tests ................................................................................................................. 13

9.1  General ............................................................................................................... 13

9.2  Tests on interfaces and connections of end fittings ............................................... 13

9.2.1  General ................................................................................................... 13

9.2.2  Tes t spec imens ........................................................................................ 13

9.2.3  Reference voltage and temperature for verification tests ........................... 13

9.2.4  Reference dry power frequency test ......................................................... 13

9.2.5  Product specific pre-stressing .................................................................. 13

9.2.6  Water immersion pre-stressing ................................................................. 14

9.2.7  Verification tests ...................................................................................... 14

9.3  Tests on shed and housing material ..................................................................... 15

9.3.1  Hardness test .......................................................................................... 15

9.3.2  Accelerated weathering test ..................................................................... 15

9.3.3  Tracking and erosion test – 1 000 h salt fog test – Procedure .................... 16

9.3.4  Flammability test ...................................................................................... 18

9.4  Tests on the core material ................................................................................... 18

9.4.1  Porosity Test (Dye penetration test) ......................................................... 18

9.4.2  Water diffusion test .................................................................................. 19

Annex A (informative) Difference between the tracking and erosion and accelerated

ageing test on polymeric insulators ............................................................................... 23

Annex B (informative) Recommended application of tests ................................................... 24

Annex C (informative) Explanation of the concept of classes for the design tests ................ 25

Bibliography .................................................................................................................. ..... 26

Figure 1 – Examples of test specimen for core material ....................................................... 19

Figure 2 – Example of boiling container for the water diffusion test ...................................... 20

Figure 3 – Electrodes for the voltage test ............................................................................ 21

Figure 4 – Voltage test circuit .............................................................................................. 22

---------------------- Page: 4 ----------------------
62217 © IEC:2012 – 3 –

Table 1 – Normal environmental conditions ........................................................................... 11

Table 2 – Initial NaCl content of the water as a function of the specimen dimensions............ 17

Table 3 – Flammability requirements .................................................................................... 18

---------------------- Page: 5 ----------------------
– 4 – 62217 © IEC:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POLYMERIC HV INSULATORS
FOR INDOOR AND OUTDOOR USE –
GENERAL DEFINITIONS, TEST METHODS
AND ACCEPTANCE CRITERIA
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). 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. 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 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 IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62217 has been prepared by IEC technical committee 36:

Insulators.

This second edition cancels and replaces the first edition published in 2005. This edition

constitutes a technical revision.

This edition includes a significant technical change with respect to the previous edition.

The first edition of IEC 62217 (2005) included two other alternative tracking and erosion tests

(a 5 000 hour multi-stress test and a tracking wheel test) which were based on tests

developed by CIGRE and utilities. These tests are no longer given as normative alternatives

following the results of a study/questionnaire by TC 36 on the relative merits of all three

tracking and erosion tests. The 5 000 hour multi-stress test and a tracking wheel test are

described in IEC/TR 62730 (2012).
---------------------- Page: 6 ----------------------
62217 © IEC:2012 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
36/321/FDIS 36/324/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 2.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – 62217 © IEC:2012
INTRODUCTION

Polymeric insulators consist either of one insulating material (resin insulators) or two or

several insulating materials (composite insulators). The insulating materials are generally

cross-linked organic materials synthesised from carbon or silicon chemistry and form the

insulating body. Insulating materials can be composed from organic materials containing

various inorganic and organic ingredients, such as fillers and extenders. End fittings are often

used at the ends of the insulating body to transmit mechanical loads. Despite these common

features, the materials used and the construction details employed by different manufacturers

may be widely different.

The tests given in this standard are those which are, in general, common to a great majority

of insulator designs and materials, whatever their final application. They have been regrouped

in this standard to avoid repetition in the relevant product standards and drift between

procedures as the various product standards are drafted or revised.

The majority of these tests have been grouped together as "Design tests", to be performed

only once for insulators of the same design. The design tests are intended to eliminate

insulator designs, materials or manufacturing technologies which are not suitable for high-

voltage applications. The influence of time on the electrical properties of the complete

polymeric insulator and its components (core material, housing, interfaces etc.) has been

considered in specifying the design tests in order to ensure a satisfactory lifetime under

normal operating and environmental conditions.

Pollution tests, according to IEC 60507 or IEC 61245, are not included in this document, the

applicability of their methodology to composite insulators not having been proven and still

requiring study by CIGRE. The results of such pollution tests performed on insulators made of

polymeric materials do not correlate with experience obtained from service. Specific pollution

tests for polymeric insulators are still under consideration.

The 1 000 hour salt-fog tracking and erosion test given in this second edition of IEC 62217 is

considered as a screening test intended to reject materials or designs which are inadequate.

This test is not intended to predict long term performance for insulator designs under

cumulative service stresses. For more information, see Annex C. The first edition of

IEC 62217 (2005) included two other alternative tracking and erosion tests (a 5 000 hour

multi-stress test and a tracking wheel test) which were based on tests developed by CIGRE

and utilities. These tests are no longer given as normative alternatives following the results of

a study/questionnaire by TC 36 on the relative merits of all three tracking and erosion tests.

The 5 000 hour multi-stress test and a tracking wheel test are described in IEC/TR 62730

(2012).

Composite insulators are used in both a.c. and d.c. applications. In spite of this fact a specific

tracking and erosion test procedure for d.c. applications as a design test has not yet been

defined and accepted. The 1 000 hour a.c. tracking and erosion test described in this

standard is used to establish a minimum requirement for the tracking resistance of the

housing material.

IEC Guide 111 has been followed wherever possible during the preparation of this standard.

---------------------- Page: 8 ----------------------
62217 © IEC:2012 – 7 –
POLYMERIC HV INSULATORS
FOR INDOOR AND OUTDOOR USE –
GENERAL DEFINITIONS, TEST METHODS
AND ACCEPTANCE CRITERIA
1 Scope and object

This International Standard is applicable to polymeric insulators whose insulating body

consists of one or various organic materials. Polymeric insulators covered by this standard

include both solid core and hollow insulators. They are intended for use on HV overhead lines

and in indoor and outdoor equipment.
The object of this standard is
– to define the common terms used for polymeric insulators;
– to prescribe common test methods for design tests on polymeric insulators;
– to prescribe acceptance or failure criteria, if applicable;

These tests, criteria and recommendations are intended to ensure a satisfactory life-time

under normal operating and environmental conditions (see Clause 5). This standard shall only

be applied in conjunction with the relevant product standard.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 60050-471:2007, International Electrotechnical Vocabulary – Part 471: Insulators

IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements

IEC 60068-2-11, Environmental testing – Part 2: Tests. Test KA: Salt mist

IEC 60507, Artificial pollution tests on high-voltage insulators to be used on a.c. systems

IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical

flame test methods

IEC 60721-1, Classification of environmental conditions – Part 1: Environmental parameters

and their severities

IEC 60815-1, Selection and dimensioning of high-voltage insulators intended for use in

polluted conditions – Part 1: Definitions, information and general principles

ISO 868, Plastics and ebonite – Determination of indentation hardness by means of a

durometer (Shore hardness)
---------------------- Page: 9 ----------------------
– 8 – 62217 © IEC:2012

ISO 4287, Geometrical Product Specifications (GPS) – Surface Texture: Profile method –

Terms, definitions and surface texture parameters

ISO 4892-1, Plastics – Methods of exposure to laboratory light sources – Part 1: General

Guidance

ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc

sources
3 Terms and definitions

For the purposes of this document the terms and definitions given in IEC 60050-471:2007 and

the following apply:
3.1
high voltage (HV)
voltage over 1 000 V a.c. or over 1 500 V d.c. or over 1 500 V peak value
3.2
polymeric insulator
insulator whose insulating body consists of at least one organic based material
Note 1 to entry: Polymeric insulators are also known as non-ceramic insulators.

Note 2 to entry: Coupling devices may be attached to the ends of the insulating body.

[SOURCE: IEC 60050-471:2007, 471-01-13]
3.3
resin insulator

polymeric insulator whose insulating body consists of a solid shank and sheds protruding from

the shank made from only one organic based housing material (e.g. cycloaliphatic epoxy)

3.4
composite insulator

insulator made of at least two insulating parts, namely a core and a housing equipped with

metal fittings

Note 1 to entry: Composite insulators, for example, can consist either of individual sheds mounted on the core, with

or without an intermediate sheath, or alternatively, of a housing directly moulded or cast in one or several pieces

on to the core.
[SOURCE: IEC 60050-471:2007, 471-01-02]
3.5
core

central insulating part of an insulator which provides the mechanical characteristics

Note 1 to entry: The housing and sheds are not part of the core.
[SOURCE: IEC 60050-471:2007, 471-01-03]
3.6
insulator trunk
central insulating part of an insulator from which the sheds project
Note 1 to entry: Also known as shank on smaller insulators.
[SOURCE: IEC 60050-471:2007, 471-01-11]
---------------------- Page: 10 ----------------------
62217 © IEC:2012 – 9 –
3.7
housing

external insulating part of a composite insulator providing the necessary creepage distance

and protecting core from environment

Note 1 to entry: An intermediate sheath made of insulating material may be part of the housing.

[SOURCE: IEC 60050-471:2007, 471-01-09]
3.8
Shed (of an insulator)

insulating part, projecting from the insulator trunk, intended to increase the creepage distance

Note 1 to entry: The shed can be with or without ribs.
[SOURCE: IEC 60050-471:2007, 471-01-15]
3.9
creepage distance

shortest distance or the sum of the shortest distances along the surface on an insulator

between two conductive parts which normally have the operating voltage between them

Note 1 to entry: The surface of cement or of any other non-insulating jointing material is not considered as forming

part of the creepage distance.

Note 2 to entry: If a high resistance coating is applied to parts of the insulating part of an insulator, such parts are

considered to be effective insulating surfaces and the distance over them is included in the creepage distance.

[SOURCE: IEC 60050-471:2007, 471-01-04]
3.10
arcing distance

shortest distance in air external to the insulator between the metallic parts which normally

have the operating voltage between them
[SOURCE: IEC 60050-471:2007, 471-01-01]
3.11
interfaces
surface between the different materials
Note 1 to entry: Various interfaces occur in most composite insulators, e.g.:
– between housing and fixing devices;

– between various parts of the housing; e.g. between sheds, or between sheath and sheds;

– between core and housing.
3.12
end fitting
fixing device

integral component or formed part of an insulator, intended to connect it to a supporting

structure, or to a conductor, or to an item of equipment, or to another insulator

Note 1 to entry: Where the end fitting is metallic, the term “metal fitting” is normally used.

[SOURCE: IEC 60050-471:2007, 471-01-06, modified by the addition of a synonym]
3.13
connection zone

zone where the mechanical load is transmitted between the insulating body and the fixing

device
---------------------- Page: 11 ----------------------
– 10 – 62217 © IEC:2012
3.14
coupling

part of the fixing device which transmits load to the hardware external to the insulator

3.15
tracking

process which forms irreversible degradation by formation of conductive paths (tracks)

starting and developing on the surface of an insulating material.
Note 1 to entry: Tracking paths are conductive even under dry conditions.
3.16
erosion

irreversible and non-conducting degradation of the surface of the insulator that occurs by loss

of material. This can be uniform, localized or tree-shaped

Note 1 to entry: Light surface traces, commonly tree-shaped, can occur on composite insulators as on ceramic

insulators, after partial flashover. These traces are not considered to be objectionable as long as they are non-

conductive. When they are conductive they are classified as tracking.
3.17
crack
any internal fracture or surface fissure of depth greater than 0,1 mm
3.18
puncture

permanent loss of dielectric strength due to a disruptive discharge passing through the solid

insulating material of an insulator

[SOURCE: IEC 60050-471:2007, 471-01-14, modified to define puncture as the result of a

discharge, rather than the discharge itself]
4 Identification

The manufacturer’s drawing shall show the relevant dimensions and information necessary for

identifying and testing the insulator in accordance with this International Standard and the

applicable IEC product standard(s). The drawing shall also show applicable manufacturing

tolerances.

Each insulator shall be marked with the name or trademark of the manufacturer and the year

of manufacture. In addition, each insulator shall be marked with the rated characteristics

specified in the relevant IEC product standards. These markings shall be legible, indelible and

their fixings (if any) weather- and corrosion-proof.
5 Environmental conditions

The normal environmental conditions to which insulators are submitted in service are defined

according to Table 1.

When special environmental conditions prevail at the location where insulators are to be put

in service, they shall be specified by the user by reference to IEC 60721-1.
---------------------- Page: 12 ----------------------
62217 © IEC:2012 – 11 –
Table 1 – Normal environmental conditions
Indoor insulation Outdoor insulation
does not exceed 40 °C and its average value measured over a period of
Maximum ambient air temperature
24 h does not exceed 35 °C
Minimum ambient air temperature –25 °C –40 °C
Negligible vibration due to causes external to the insulators or to earth
Vibration a
tremors .
Solar radiation To be neglected Up to a level of 1 000 W/m
Pollution by dust, smoke, corrosive
No significant pollution by dust,
gases, vapours or salt may occur.
Pollution of the ambient air smoke, corrosive and/or flammable
Pollution does not exceed “heavy” as
gases, vapours, or salt.
defined in IEC 60815-1.
The average value of the relative
humidity, measured over a period of
24 h, does not exceed 95 % and
Humidity measured over a period of one
month, does not exceed 95 %. For
these conditions, condensation may
occasionally occur.
Vibration due to external causes can be dealt with in accordance to IEC 60721-1.
Details of solar radiation are given in IEC 60721-1.
6 Information on transport, storage and installation

Manufacturers of insulators shall provide appropriate instructions and information covering

general conditions during transport, storage and installation of the insulators. These

instructions can include recommendations for cleaning or maintenance.
7 Classification of tests
The tests are divided into four groups as follows:
7.1 Design tests

The design tests are intended to verify the suitability of the design, materials and method

of manufactu
...

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