IEC 61264:1998

Ceramic pressurized hollow insulators for high-voltage switchgear and controlgear

Applies to hollow insulators made of ceramic material, with their fixing devices, intended for use with a permanent gas pressure greater than 50 kPa gauge having an internal volume equal to or greater than 1 l (1 000 cm3). They are intended for use in electrical equipment operating on alternating current with a rated voltage greater than 1000 V and a frequency not greater than 100 Hz or for use in direct current equipment with a rated voltage greater than 1 500 V.

Enveloppes isolantes sous pression en matière céramique pour l'appareillage haute tension

S'applique aux isolateurs en matière céramique creux, avec leurs dispositifs de fixation, destinés à être utilisés avec une pression de gaz permanente supérieure à 50 kPa et ayant un volume interne égal ou supérieur à 1 l (1 000 cm3). Ils sont destinés à être utilisés dans des appareils électriques fontionnant en courant alternatif avec une tension nominale supérieure à 1 000 V et une fréquence de 100 Hz au maximum, ou dans des appareils à courant continu avec une tension nominale supérieure à 1 500 V.

General Information

• Status: Replaced
• Publication Date: 30-Sep-1998
• ICS: 29.080.10 - Insulators
• Technical Committee: TC 36 - Insulators
• Drafting Committee: WG 7 - TC 36/WG 7
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 26-May-2003

Relations

• Replaced By: IEC 62155:2003 - Hollow pressurized and unpressurized ceramic and glass insulators for use in electrical equipment with rated voltages greater than 1 000 V
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL
IEC
STANDARD
Second edition
1998-10
Ceramic pressurized hollow insulators
for high-voltage switchgear and controlgear
Enveloppes isolantes sous pression en matière céramique
pour l’appareillage haute tension

Reference number
Numbering
As from 1 January 1997 all IEC publications are issued with a designation in
the 60 000 series.
Consolidated publications
Consolidated versions of some IEC publications including amendments are

available. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the
base publication, the base publication incorporating amendment 1 and the base

publication incorporating amendments 1 and 2.

Validity of this publication
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology.
Information relating to the date of the reconfirmation of the publication is available
in the IEC catalogue.
Information on the subjects under consideration and work in progress undertaken by
the technical committee which has prepared this publication, as well as the list of
publications issued, is to be found at the following IEC sources:
• IEC web site*
• Catalogue of IEC publications
Published yearly with regular updates
(On-line catalogue)*
• IEC Bulletin
Available both at the IEC web site* and as a printed periodical
Terminology, graphical and letter symbols
For general terminology, readers are referred to IEC 60050: International Electro-
technical Vocabulary (IEV).
For graphical symbols, and letter symbols and signs approved by the IEC for
general use, readers are referred to publications IEC 60027: Letter symbols to be
used in electrical technology, IEC 60417: Graphical symbols for use on equipment.
Index, survey and compilation of the single sheets and IEC 60 617: Graphical symbols
for diagrams.
*  IEC web site http: //www.iec.ch.

INTERNATIONAL
IEC
STANDARD
Second edition
1998-10
Ceramic pressurized hollow insulators
for high-voltage switchgear and controlgear
Enveloppes isolantes sous pression en matière céramique
pour l’appareillage haute tension

 IEC 1998  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
S
International Electrotechnical Commission
For price, see current catalogue

– 2 – 61264 © IEC:1998(E)
CONTENTS
Page
FOREWORD . 3

INTRODUCTION . 4

Clause
1 Scope and object . 5

2 Normative references. 5
3 Definitions. 6
4 General recommendations for design and construction . 8
4.1 Purpose. 8
4.2 Rules for design. 8
5 General requirements for tests . 11
5.1 Classification of tests . 11
5.2 General requirements for pressure tests. 11
5.3 General requirements for bending tests . 11
6 Type tests. 12
6.1 General. 12
6.2 Pressure test. 12
6.3 Bending test. 12
7 Sample tests. 13
7.1 Selection and number of test pieces . 13
7.2 Tests. 13
7.3 Re-test procedure. 13
7.4 Verification of dimensions . 27
7.5 Control of the roughness of ground parts. 14
7.6 Mechanical test (for assembled hollow insulators) . 14
8 Routine tests. 14
8.1 General. 14
8.2 Mechanical tests. 14
8.3 Other tests. 15

9 Documentation. 15
9.1 Marking. 15
9.2 Certificates. 15
Annexes
A (informative) Tolerances of form and position . 16
B (informative) Bending moment equivalent to the design pressure . 21
C (informative) Bibliography. 22

61264 © IEC:1998(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

_________
CERAMIC PRESSURIZED HOLLOW INSULATORS FOR HIGH-VOLTAGE

SWITCHGEAR AND CONTROLGEAR
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 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 61264 has been prepared by subcommittee 36C: Insulators for
substations, of IEC technical committee 36: Insulators. It is based on CENELEC publication
EN 50062.
This second edition cancels and replaces the first edition published in 1994 and constitutes a
technical revision.
This standard supplements and modifies, if necessary, IEC 60233, which applies to
unpressurized hollow insulators.

The text of this standard is based on the following documents:
FDIS Report on voting
36C/94/FDIS 36C/101/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.
Annexes A, B and C are for information only.
A bilingual version of this standard will be issued at a later date.

– 4 – 61264 © IEC:1998(E)
INTRODUCTION
Technical improvements to this International Standard have been made in the following areas:

– guidance for load combinations: it is made clear that other combinations might exist and
that operating loads, if existent, should be considered;

– information on mechanical strength: this should be collected during testing for a possibility

of statistical evaluation;
– geometrical tolerances.
61264 © IEC:1998(E) – 5 –
CERAMIC PRESSURIZED HOLLOW INSULATORS FOR HIGH-VOLTAGE

SWITCHGEAR AND CONTROLGEAR
1 Scope and object
This International Standard applies to hollow insulators made of ceramic material, with their

fixing devices, intended for use with a permanent gas pressure greater than 50 kPa gauge

having an internal volume equal to or greater than 1 I (1 000 cm ). They are intended for use in

electrical equipment operating on alternating current with a rated voltage greater than 1 000 V

and a frequency not greater than 100 Hz or for use in direct current equipment with a rated

voltage greater than 1 500 V.
NOTE 1 – The gas can be: dry air, inert gases, e.g. sulphur hexafluoride or nitrogen or a mixture of such gases.
NOTE 2 – Hollow insulators are intended for use in electrical equipment with a permanent gas pressure, for
example
– circuit-breakers,
– switch-disconnectors,
– disconnectors,
– earthing switches,
– instrument transformers,
– surge arresters,
– bushings,
– cable sealing ends.
The object of this standard is
– to define terms used;
– to prescribe design rules;
– to prescribe test procedures and test values
regarding pressure and bending stresses for hollow insulators.
It is not the object of this standard to prescribe dielectric tests, because the withstand voltages
are not characteristics of the hollow insulator itself, but of the apparatus of which it ultimately
forms a part.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute
provisions of this International Standard. At the time of publication, the editions indicated were
valid. All standards are subject to revision, and parties to agreements based on this
International Standard are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below. Members of IEC and ISO maintain registers of
currently valid International Standards.
IEV 60050(471):1984, International Electrotechnical Vocabulary (IEV) – Chapter 471:
Insulators
IEC 60056:1987, High-voltage alternating-current circuit-breakers
IEC 60168:1994, Tests on indoor and outdoor post insulators of ceramic material or glass for
systems with nominal voltages greater than 1 000 V
IEC 60233:1974, Tests on hollow insulators for use in electrical equipment
IEC 60672-3:1997, Ceramic and glass insulating materials – Part 3: Specifications for
individual materials
– 6 – 61264 © IEC:1998(E)
IEC 60694:1996, Common specifications for high-voltage switchgear and controlgear standards

IEC 60865-1:1993, Short-circuit currents – Calculation of effects – Part 1: Definitions and

calculation methods
IEC 61166:1993, High-voltage alternating current circuit-breakers – Guide for seismic

qualification of high-voltage alternating current circuit-breakers

ISO 4287:1997, Geometrical Product Specification (GPS) – Surface texture: Profile method –
Terms, definitions and surface texture parameters

ISO 4287-2:1984, Surface roughness – Terminology – Part 2: Measurement of surface

roughness parameters
CENELEC EN 50062:1991, Ceramic pressurized hollow insulators for high-voltage switchgear
and controlgear
3 Definitions
For the purpose of this International Standard, the following definitions apply. The definitions
given below are those which either do not appear or differ from those given in IEC 60050(471)
3.1
hollow insulator body
a hollow insulating part body, which is open from end to end, with or without sheds, not
including the fixing devices or end fittings
3.2
hollow insulator
a hollow insulating part, which is open from end to end, with or without sheds, including the
fixing devices or end fittings [IEV 471-01-17, modified]
NOTE – This is a general term which also covers the definitions 3.4, 3.5 and 3.6.
3.3
fixing device or end fitting
a device forming part of a hollow insulator, intended to connect it to a supporting structure or to
an item of equipment, or to another insulator
NOTE – Where the fixing device is metallic, the term "metal fitting" is also used. [IEV 471-01-02, modified]
3.4
hollow post insulator
a hollow post insulator consists of one hollow post insulator unit or an assembly of more units
and is intended to give support to a live part, which is to be insulated from earth
...

NORME
CEI
INTERNATIONALE
IEC
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1998-10
Enveloppes isolantes sous pression en matière
céramique pour l'appareillage haute tension
Ceramic pressurized hollow insulators for
high-voltage switchgear and controlgear

Numéro de référence
Reference number
CEI/IEC 61264: 1998
Numéros des publications Numbering

Depuis le 1er janvier 1997, les publications de la CEI As from 1 January 1997 all IEC publications are

sont numérotées à partir de 60000. issued with a designation in the 60000 series.

Publications consolidées Consolidated publications

Les versions consolidées de certaines publications de Consolidated versions of some IEC publications
la CEI incorporant les amendements sont disponibles. including amendments are available. For example,

Par exemple, les numéros d’édition 1.0, 1.1 et 1.2 edition numbers 1.0, 1.1 and 1.2 refer, respectively, to

indiquent respectivement la publication de base, la the base publication, the base publication
publication de base incorporant l’amendement 1, et la incorporating amendment 1 and the base publication
publication de base incorporant les amendements 1 incorporating amendments 1 and 2.

et 2.
Validité de la présente publication Validity of this publication
Le contenu technique des publications de la CEI est The technical content of IEC publications is kept under
constamment revu par la CEI afin qu'il reflète l'état constant review by the IEC, thus ensuring that the
actuel de la technique. content reflects current technology.
Des renseignements relatifs à la date de Information relating to the date of the reconfirmation of
reconfirmation de la publication sont disponibles dans the publication is available in the IEC catalogue.
le Catalogue de la CEI.
Les renseignements relatifs à des questions à l’étude et Information on the subjects under consideration and
des travaux en cours entrepris par le comité technique work in progress undertaken by the technical
qui a établi cette publication, ainsi que la liste des committee which has prepared this publication, as well
publications établies, se trouvent dans les documents ci- as the list of publications issued, is to be found at the
dessous: following IEC sources:
• «Site web» de la CEI* • IEC web site*
• Catalogue des publications de la CEI • Catalogue of IEC publications
Publié annuellement et mis à jour régulièrement Published yearly with regular updates
(Catalogue en ligne)* (On-line catalogue)*
• Bulletin de la CEI • IEC Bulletin
Disponible à la fois au «site web» de la CEI* et Available both at the IEC web site* and as a
comme périodique imprimé printed periodical
Terminologie, symboles graphiques Terminology, graphical and letter
et littéraux symbols
En ce qui concerne la terminologie générale, le lecteur For general terminology, readers are referred to
se reportera à la CEI 60050: Vocabulaire Electro- IEC 60050: International Electrotechnical Vocabulary
technique International (VEI). (IEV).
Pour les symboles graphiques, les symboles littéraux For graphical symbols, and letter symbols and signs
et les signes d'usage général approuvés par la CEI, le approved by the IEC for general use, readers are
lecteur consultera la CEI 60027: Symboles littéraux à referred to publications IEC 60027: Letter symbols to
utiliser en électrotechnique, la CEI 60417: Symboles be used in electrical technology, IEC 60417: Graphical
graphiques utilisables sur le matériel. Index, relevé et symbols for use on equipment. Index, survey and

compilation des feuilles individuelles, et la CEI 60617: compilation of the single sheets and IEC 60617:
Symboles graphiques pour schémas. Graphical symbols for diagrams.
* Voir adresse «site web» sur la page de titre. * See web site address on title page.

NORME
CEI
INTERNATIONALE
IEC
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1998-10
Enveloppes isolantes sous pression en matière
céramique pour l'appareillage haute tension
Ceramic pressurized hollow insulators for
high-voltage switchgear and controlgear

 IEC 1998 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
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE S
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

– 2 – 61264  CEI:1998
SOMMAIRE
Pages
AVANT-PROPOS . 4

INTRODUCTION . 6

Articles
1 Domaine d’application et objet. 8

2 Références normatives. 8
3 Définitions. 10
4 Recommandations générales pour la conception et la construction . 14
4.1 Objet. 14
4.2 Règles de conception. 14
5 Prescriptions générales d’essais . 20
5.1 Classification des essais . 20
5.2 Prescriptions générales pour les essais de pression . 22
5.3 Prescriptions générales pour les essais de flexion . 22
6 Essais de type. 24
6.1 Généralités . 24
6.2 Essai de pression. 24
6.3 Essai de flexion. 24
7 Essais sur prélèvements . 26
7.1 Sélection et nombre des pièces prélevées . 26
7.2 Essais. 26
7.3 Procédure de contre-épreuve . 26
7.4 Vérification des dimensions. 26
7.5 Contrôle de la rugosité des parties meulées . 26
7.6 Essai de robustesse mécanique (pour les enveloppes isolantes munies
de leurs armatures métalliques) . 28
8 Essais individuels. 28
8.1 Généralités . 28
8.2 Essais individuels de robustesse mécanique . 28

8.3 Autres essais . 30
9 Documentation. 30
9.1 Marquage. 30
9.2 Certificats . 30
Annexes
A (informative) Tolérances de forme et de position . 32
B (informative) Moment fléchissant équivalent à la pression de calcul . 42
C (informative) Bibliographie . 44

61264  IEC:1998 – 3 –
CONTENTS
Page
FOREWORD . 5

INTRODUCTION . 7

Clause
1 Scope and object . 9

2 Normative references . 9
3 Definitions. 11
4 General recommendations for design and construction . 15
4.1 Purpose . 15
4.2 Rules for design. 15
5 General requirements for tests . 21
5.1 Classification of tests . 21
5.2 General requirements for pressure tests. 23
5.3 General requirements for bending tests . 23
6 Type tests . 25
6.1 General. 25
6.2 Pressure test . 25
6.3 Bending test. 25
7 Sample tests . 27
7.1 Selection and number of test pieces . 27
7.2 Tests . 27
7.3 Re-test procedure . 27
7.4 Verification of dimensions . 27
7.5 Control of the roughness of ground parts. 27
7.6 Mechanical test (for assembled hollow insulators) . 29
8 Routine tests. 29
8.1 General. 29
8.2 Mechanical tests . 29
8.3 Other tests. 31

9 Documentation. 31
9.1 Marking. 31
9.2 Certificates . 31
Annexes
A (informative) Tolerances of form and position . 33
B (informative) Bending moment equivalent to the design pressure . 43
C (informative) Bibliography. 45

– 4 – 61264  CEI:1998
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE

_________
ENVELOPPES ISOLANTES SOUS PRESSION EN MATIÈRE CÉRAMIQUE

POUR L’APPAREILLAGE HAUTE TENSION

AVANT-PROPOS
1) La CEI (Commission Electrotechnique Internationale) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a pour objet de
favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de
l'électricité et de l'électronique. A cet effet, la CEI, entre autres activités, publie des Normes internationales.
Leur élaboration est confiée à des comités d'études, aux travaux desquels tout Comité national intéressé par le
sujet traité peut participer. Les organisations internationales, gouvernementales et non gouvernementales, en
liaison avec la CEI, participent également aux travaux. La CEI collabore étroitement avec l'Organisation
Internationale de Normalisation (ISO), selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
du possible un accord international sur les sujets étudiés, étant donné que les Comités nationaux intéressés
sont représentés dans chaque comité d’études.
3) Les documents produits se présentent sous la forme de recommandations internationales. Ils sont publiés
comme normes, rapports techniques ou guides et agréés comme tels par les Comités nationaux.
4) Dans le but d'encourager l'unification internationale, les Comités nationaux de la CEI s'engagent à appliquer de
façon transparente, dans toute la mesure possible, les Normes inte
...