SIST EN 62772:2017
(Main)Composite Hollow Core Station Post Insulators for substations with a.c. voltage greater than 1000 V and d.c. voltage greater than 1500V- Definitions, test methods and acceptance criteria (IEC 62772:2016)
Composite Hollow Core Station Post Insulators for substations with a.c. voltage greater than 1000 V and d.c. voltage greater than 1500V- Definitions, test methods and acceptance criteria (IEC 62772:2016)
This International Standard applies to composite hollow core station post insulators consisting
of a load-bearing insulating tube (core) made of resin impregnated fibres an insulating filler
material (e.g. solid, liquid, foam, gaseous – pressurized or unpressurized), a housing (outside
the insulating tube) made of polymeric material (for example silicone or ethylene-propylene)
and metal fixing devices at the ends of the insulating tube. Composite hollow core station post
insulators as defined in this standard are intended for general use in substations in both,
outdoor and indoor environments, operating with a rated AC voltage greater than 1 000 V and
a frequency not greater than 100 Hz or for use in direct current systems with a rated voltage
greater than 1 500 V.
The object of this standard is:
– to define the terms used;
– to prescribe test methods;
– to prescribe acceptance criteria.
All the tests in this standard, apart from the thermal-mechanical test, are performed at normal
ambient temperature. This standard does not prescribe tests that may be characteristic of the
apparatus of which the composite hollow core station post insulator ultimately may form a
part. Further technical input is required in this area.
NOTE 1 "Pressurized" means a permanent gas or liquid pressure greater than 0,05 MPa (0,5 bar) gauge. The gas
can be dry air or inert gases, for example sulphur hexafluoride, nitrogen, or a mixture of such gases.
NOTE 2 "Unpressurized" means a gas or liquid pressure smaller than or equal to 0,05 MPa (0,5 bar) gauge.
Hohlkern-Verbundstützinsolatoren für Schaltanlagen mit Wechsel - und Gleichspannung über 1 000 V - Begriffe, Prüfverfahren und Annahmekriterien (IEC 62772:2016)
Isolateurs supports composites creux pour postes présentant une tension alternative supérieure à 1 000 V et une tension continue supérieure à 1 500 V - Définitions, méthodes d'essai et critères d'acceptation (IEC 62772:2016)
L'IEC 62772:2016 s'applique aux isolateurs supports composites creux constitués d'un tube (noyau) isolant en fibres imprégnées de résine supportant la charge mécanique, d'un matériau de charge isolant (solide, liquide, mousse, gaz, sous pression ou pas, par exemple), d'un revêtement en polymère à l'extérieur du tube isolant (silicone ou éthylènepropylène, par exemple) et d'armatures de fixation à ses extrémités. Les isolateurs supports composites creux, tels que définis dans la présente norme, sont destinés à l'utilisation générale dans les postes, tant en extérieur qu'en intérieur. Ils fonctionnent avec une tension alternative assignée de plus de 1 000 V et à une fréquence maximale de 100 Hz ou sont utilisés dans les systèmes à courant continu avec une tension assignée supérieure à 1 500 V. L'objet de la présente norme est le suivant:
- définir les termes utilisés;
- spécifier des méthodes d essai;
- spécifier des critères d acceptation.
Tous les essais de la présente norme, outre l'essai thermomécanique, sont réalisés à température ambiante normale. La présente norme ne spécifie aucun essai pouvant être caractéristique de l'appareillage dont l'isolateur support composite creux peut en fin de compte faire partie.
Votli kompozitni podporni izolatorji za postaje z izmeničnimi napetostmi, višjimi od 1000 V, in enosmernimi napetostmi, višjimi od 1500 V - Definicije, preskusne metode in merila sprejemljivosti (IEC 62772:2016)
Ta mednarodni standard se uporablja za votle kompozitne podporne izolatorje za postaje, sestavljene iz nosilne izolacijske cevi (jedro) iz vlaken, impregniranih s smolo, izolacijskega polnilnega materiala (npr. trdnega, tekočega, penastega, plinastega materiala, ki je ali ni pod tlakom), ohišja (na zunanji strani izolacijske cevi) iz polimernega materiala (npr. iz silikona ali etilen-propilena) in kovinskih pritrdil ob koncih izolacijske cevi. Votli kompozitni podporni izolatorji za postaje, opredeljeni v tem standardu, so namenjeni za splošno uporabo v razdelilnih postajah v zaprtih prostorih ali na prostem, ki delujejo z nazivnimi izmeničnimi napetostmi, višjimi od 1000 V, in frekvencami, nižjimi od 100 Hz, ali za uporabo v sistemih z enosmernim tokom in nazivnimi napetostmi, višjimi od 1500 V.
Namen tega standarda je:
– definirati uporabljane izraze;
– določiti preskusne metode;
– določiti merila sprejemljivosti.
Vsi preskusi v okviru tega standarda, razen toplotno-mehanskega preskusa, se izvajajo pri običajni temperaturi okolja. Ta standard ne določa preskusov, ki so morda značilni za napravo, katere del je lahko votli kompozitni podporni izolator za postaje. Na tem področju so potrebni dodatni tehnični podatki.
OPOMBA 1: »Ki je pod tlakom« pomeni prisotnost stalnega tlaka plina ali tekočine z izmerjeno vrednostjo nad 0,05 MPa (0,5 bara). Plin je lahko suh zrak ali inertni plin, na primer žveplov heksafluorid, dušik ali mešanica tovrstnih plinov.
OPOMBA 2: »Ki ni pod tlakom« pomeni prisotnost tlaka plina ali tekočine z izmerjeno vrednostjo največ 0,05 MPa (0,5 bara).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 62772:2017
01-februar-2017
9RWOLNRPSR]LWQLSRGSRUQLL]RODWRUML]DSRVWDMH]L]PHQLþQLPLQDSHWRVWPLYLãMLPLRG
9LQHQRVPHUQLPLQDSHWRVWPLYLãMLPLRG9'HILQLFLMHSUHVNXVQH
PHWRGHLQPHULODVSUHMHPOMLYRVWL ,(&
Composite Hollow Core Station Post Insulators for substations with a.c. voltage greater
than 1000 V and d.c. voltage greater than 1500V- Definitions, test methods and
acceptance criteria (IEC 62772:2016)
Hohlkern-Verbundstützinsolatoren für Schaltanlagen mit Wechsel - und Gleichspannung
über 1 000 V - Begriffe, Prüfverfahren und Annahmekriterien (IEC 62772:2016)
Isolateurs supports composites creux pour postes présentant une tension alternative
supérieure à 1 000 V et une tension continue supérieure à 1 500 V - Définitions,
méthodes d'essai et critères d'acceptation (IEC 62772:2016)
Ta slovenski standard je istoveten z: EN 62772:2016
ICS:
29.080.10 Izolatorji Insulators
SIST EN 62772:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 62772:2017
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SIST EN 62772:2017
EUROPEAN STANDARD EN 62772
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2016
ICS 29.080.10
English Version
Composite Hollow Core Station Post Insulators for substations
with a.c. voltage greater than 1000 V and d.c. voltage greater
than 1500V- Definitions, test methods and acceptance criteria
(IEC 62772:2016)
Isolateurs supports composites creux pour postes Hohlkern-Verbundstützinsolatoren für Schaltanlagen mit
présentant une tension alternative supérieure à 1 000 V et Wechsel - und Gleichspannung über 1 000 V - Begriffe,
une tension continue supérieure à 1 500 V - Définitions, Prüfverfahren und Annahmekriterien
méthodes d'essai et critères d'acceptation (IEC 62772:2016)
(IEC 62772:2016)
This European Standard was approved by CENELEC on 2016-09-21. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62772:2016 E
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SIST EN 62772:2017
EN 62772:2016
European foreword
The text of document 36/386/FDIS, future edition 1 of IEC 62772, prepared by IEC/TC 36 "Insulators"
was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62772:2016.
The following dates are fixed:
(dop) 2017-06-21
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2019-09-21
• latest date by which the national standards conflicting with
the document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62772:2016 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated :
IEC 60068-2-17 NOTE Harmonized as EN 60068-2-17.
IEC 62155 NOTE Harmonized as EN 62155.
ISO 1101 NOTE Harmonized as EN ISO 1101.
2
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SIST EN 62772:2017
EN 62772:2016
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60060-1 2010 High-voltage test techniques -- Part 1: EN 60060-1 2010
General definitions and test requirements
IEC 60168 2001 Tests on indoor and outdoor post - -
insulators of ceramic material or glass for
systems with nominal voltages greater than
1000 V
IEC 61109 2008 Insulators for overhead lines - Composite EN 61109 2008
suspension and tension insulators for a.c.
systems with a nominal voltage greater
than 1 000 V - Definitions, test methods
and acceptance criteria
IEC 61462 2007 Composite hollow insulators - Pressurized EN 61462 2007
and unpressurized insulators for use in
electrical equipment with rated voltage
greater than 1 000 V - Definitions, test
methods, acceptance criteria and design
recommendations
IEC 62217 2012 Polymeric HV insulators for indoor and EN 62217 2013
outdoor use - General definitions, test
methods and acceptance criteria
IEC 62231 2006 Composite station post insulators for EN 62231 2006
substations with a.c. voltages greater than
1 000 V up to 245 kV - Definitions, test
methods and acceptance criteria
3
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SIST EN 62772:2017
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SIST EN 62772:2017
IEC 62772
®
Edition 1.0 2016-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Composite hollow core station post insulators for substations with a.c. voltage
greater than 1 000 V and d.c. voltage greater than 1 500 V – Definitions, test
methods and acceptance criteria
Isolateurs supports composites creux pour postes présentant une tension
alternative supérieure à 1 000 V et une tension continue supérieure à 1 500 V –
Définitions, méthodes d'essai et critères d'acceptation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.10 ISBN 978-2-8322-3601-7
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
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SIST EN 62772:2017
– 2 – IEC 62772:2016 © IEC 2016
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Terms and definitions . 8
4 Identification and marking . 12
5 Environmental conditions . 12
6 Information on transport, storage and installation . 12
7 Classification of tests . 12
7.1 General . 12
7.2 Design tests . 13
7.3 Type tests . 13
7.4 Sample tests . 13
7.5 Routine tests . 13
8 Design tests . 14
8.1 General . 14
8.2 Tests on interfaces and connections of end fittings . 15
8.2.1 General . 15
8.2.2 Test specimens . 15
8.2.3 Reference dry power frequency test . 15
8.2.4 Thermal mechanical pre-stressing test . 15
8.2.5 Water immersion pre-stressing test . 15
8.2.6 Verification tests . 15
8.3 Assembled core load tests . 16
8.3.1 Test for the verification of the maximum design cantilever load (MDCL) . 16
8.3.2 Test for the verification of the maximum design torsion load (MDToL) . 16
8.3.3 Verification of the specified tension load (STL) . 17
8.4 Tests on shed and housing material . 18
8.4.1 General . 18
8.4.2 Tracking and erosion test . 18
8.4.3 Flammability test . 18
8.5 Tests on the tube material . 18
8.5.1 General . 18
8.5.2 Dye penetration test . 18
8.5.3 Water diffusion test . 18
9 Type tests . 18
9.1 Internal pressure test . 18
9.2 Bending test . 18
9.3 Specified tension load test, compression and buckling withstand load test . 19
9.4 Electrical tests . 19
9.5 Wet switching impulse withstand voltage . 19
10 Sample tests . 19
11 Routine tests . 19
11.1 General . 19
11.2 Routine seal leak rate test . 19
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11.3 Test procedure . 19
11.4 Acceptance criteria . 19
12 Documentation . 20
Annex A (informative) Water diffusion test . 21
Bibliography . 22
Figure A.1 – Example of sample preparation for water diffusion test . 21
Table 1 – Required design and type tests . 14
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMPOSITE HOLLOW CORE STATION POST INSULATORS
FOR SUBSTATIONS WITH A.C. VOLTAGE GREATER THAN
1 000 V AND D.C. VOLTAGE GREATER THAN 1 500 V –
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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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 62772 has been prepared by IEC technical committee 36:
Insulators.
The text of this standard is based on the following documents:
FDIS Report on voting
36/386/FDIS 36/389/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.
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SIST EN 62772:2017
IEC 62772:2016 © IEC 2016 – 5 –
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.
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INTRODUCTION
Composite hollow core station post insulators consist of an insulating hollow core (tube),
bearing the mechanical load protected by a polymeric housing, the load being transmitted to
the core by end fittings. The hollow core is filled entirely with an insulating material. The core
is made of resin impregnated fibres.
Composite hollow core station post insulators are typically applied as post insulators in
substations. In order to perform the design tests, IEC 62217 is to be applied for materials and
interfaces of the insulator. Some tests have been grouped together as "design tests", to be
performed only once on insulators which satisfy the same design conditions. For all design
tests on composite hollow core station post insulators, the common clauses defined in
IEC 62217 are applied. As far as practical, the influence of time on the electrical and
mechanical properties of the components (core material, housing, interfaces etc.) and of the
complete composite hollow core station post insulator has been considered in specifying the
design tests to ensure a satisfactory life-time under normally known stress conditions in
service.
This standard relates to IEC 61462, Composite hollow insulators – Pressurized and
unpressurized insulators for use in electrical equipment with rated voltage greater than
1 000 V – Definitions, test methods, acceptance criteria and design recommendations, as well
as IEC 62231, Composite station post insulators for substations with a.c. voltages greater
than 1 000 V up to 245 kV – Definitions, test methods and acceptance criteria. Tests and
requirements described in IEC 62231 can be used although this standard has no voltage limit.
The use of polymeric housing materials that show hydrophobicity and hydrophobicity transfer
mechanism (HTM) is preferred for composite hollow core station post insulators. This is due
to the fact that the influence of diameter can be significant for hydrophilic surfaces (see also
IEC 60815-3). For instance silicone rubber is recognized as successful countermeasure
against severe polluted service conditions. The ageing performance of the polymeric housing
can be evaluated by the salt fog test standardized in IEC 62217. For the time being, no test is
defined to quantify the HTM, but CIGRE SC D.1 deals with this subject intensively and
Technical Brochure No. 442 is available for the evaluation of the retention of the
hydrophobicity.
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SIST EN 62772:2017
IEC 62772:2016 © IEC 2016 – 7 –
COMPOSITE HOLLOW CORE STATION POST INSULATORS
FOR SUBSTATIONS WITH A.C. VOLTAGE GREATER THAN
1 000 V AND D.C. VOLTAGE GREATER THAN 1 500 V –
DEFINITIONS, TEST METHODS AND ACCEPTANCE CRITERIA
1 Scope
This International Standard applies to composite hollow core station post insulators consisting
of a load-bearing insulating tube (core) made of resin impregnated fibres an insulating filler
material (e.g. solid, liquid, foam, gaseous – pressurized or unpressurized), a housing (outside
the insulating tube) made of polymeric material (for example silicone or ethylene-propylene)
and metal fixing devices at the ends of the insulating tube. Composite hollow core station post
insulators as defined in this standard are intended for general use in substations in both,
outdoor and indoor environments, operating with a rated AC voltage greater than 1 000 V and
a frequency not greater than 100 Hz or for use in direct current systems with a rated voltage
greater than 1 500 V.
The object of this standard is:
– to define the terms used;
– to prescribe test methods;
– to prescribe acceptance criteria.
All the tests in this standard, apart from the thermal-mechanical test, are performed at normal
ambient temperature. This standard does not prescribe tests that may be characteristic of the
apparatus of which the composite hollow core station post insulator ultimately may form a
part. Further technical input is required in this area.
NOTE 1 "Pressurized" means a permanent gas or liquid pressure greater than 0,05 MPa (0,5 bar) gauge. The gas
can be dry air or inert gases, for example sulphur hexafluoride, nitrogen, or a mixture of such gases.
NOTE 2 "Unpressurized" means a gas or liquid pressure smaller than or equal to 0,05 MPa (0,5 bar) gauge.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60168:2001, Tests on indoor and outdoor post insulators of ceramic material or glass for
systems with nominal voltages greater than 1 000 V
IEC 61109:2008, Insulators for overhead lines – Composite suspension and tension insulators
for a.c. systems with a nominal voltage greater than 1 000 V – Definitions, test methods and
acceptance criteria
IEC 61462:2007, Composite hollow insulators – Pressurized and unpressurized insulators for
use in electrical equipment with rated voltage greater than 1 000 V – Definitions, test
methods, acceptance criteria and design recommendations
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IEC 62217:2012, Polymeric HV insulators for indoor and outdoor use – General definitions,
test methods and acceptance criteria
IEC 62231:2006, Composite station post insulators for substations with a.c. voltages greater
than 1 000 V up to 245 kV – Definitions, test methods and acceptance criteria
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
composite hollow core station post insulator
insulator consisting of at least three insulating parts, namely a tube, an internal filler and a
housing
Note 1 to entry: The housing may consist either of individual sheds mounted on the tube, with or without an
intermediate sheath, or directly applied in one or several pieces onto the tube. A composite hollow core station
post insulator unit is permanently equipped with fixing devices.
3.2
tube (core)
insulating part of a composite hollow core station post insulator designed to ensure the
mechanical characteristics
Note 1 to entry The tube is generally cylindrical or conical, but may have other shapes (for example barrel). The
tube is made of resin impregnated fibres.
Note 2 to entry Resin impregnated fibres are structured in such a manner as to achieve sufficient mechanical
strength. Layers of different fibres may be used to fulfil special requirements.
3.3
filler
insulating material filling the entire space (e.g. solid, liquid, foam, gaseous – pressurized or
unpressurized) of the hollow core station post insulator which has no load bearing function
3.4
fixing device (end fitting)
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]
3.5
coupling
part of the end fitting which transmits the load to the accessories external to the insulator
[SOURCE: IEC 62217:2012, definition 3.13]
3.6
connection zone
zone where the mechanical load is transmitted between the insulating body and the end fitting
[SOURCE: IEC 62217:2012, definition 3.12]
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3.7
housing
external insulating part of composite hollow core station post insulator providing necessary
creepage distance and protecting the tube from the environment
Note 1 to entry: If an intermediate sheath is used it forms a part of the housing
[SOURCE: IEC 62217:2012, definition 3.7, modified ("composite insulator" replaced by
"composite hollow core station post insulator", "protecting core" replaced by "protecting the
tube")]
3.8
shed
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
insulator trunk
central insulating part of an insulator from which the sheds protrude
Note 1 to entry: Also known as shank on smaller insulators.
[SOURCE: IEC 60050-471:2007, 471-01-11]
3.10
creepage distance
shortest distance or the sum of the shortest distances along the surface of an insulator
between two conductive parts which normally have the operating voltage between them
Note 1 to entry: The surface of any 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]
3.11
arcing distance
shortest distance in the 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]
3.12
interface
surface between the different materials
Note 1 to entry: Various interfaces occur in most composite insulators, e.g.
– between housing and end fittings,
– between various parts of the housing; e.g. between sheds, or between sheath and sheds,
– between core and housing
– between core and filler.
[SOURCE: IEC 62217:2012, definition 3.11]
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3.13
damage limit of the tube under mechanical stress
limit below which mechanical loads can be applied, at normal ambient temperature, without
micro damage to the composite tube
Note 1 to entry: Applying such loads means that the tube is in a reversible elastic phase. If the damage limit of
the tube is exceeded, the tube is in an irreversible plastic phase, which means permanent damage to the tube
which may not be visible at a macroscopic level (for a quantitative definition see Annex C of IEC 61462:1997).
3.14
specified mechanical load
SML
cantilever load specified by the manufacturer that is used in the mechanical tests in
accordance with IEC 61462
Note 1 to entry The load is normally applied by bending at normal ambient temperature.
Note 2 to entry The SML forms the basis of the selection of composite hollow station post insulators with regard
to external loads.
3.15
maximum mechanical load
MML
highest cantilever load which is expected to be applied to the composite hollow core
...
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