IEC 62231-1:2015

IEC 62231-1 ®
Edition 1.0 2015-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Composite station post insulators for substations with AC voltages greater than
1 000 V up to 245 kV –
Part 1: Dimensional, mechanical and electrical characteristics

Supports isolants composites destinés aux postes à courant alternatif de
tensions supérieures à 1 000 V jusqu’à 245 kV –
Partie 1: Caractéristiques dimensionnelles, mécaniques et électriques

All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
15 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.

Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
Plus de 60 000 entrées terminologiques électrotechniques, en
La recherche avancée permet de trouver des publications IEC
en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et
comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus
projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des

CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
csc@iec.ch.
IEC 62231-1 ®
Edition 1.0 2015-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Composite station post insulators for substations with AC voltages greater than

1 000 V up to 245 kV –
Part 1: Dimensional, mechanical and electrical characteristics

Supports isolants composites destinés aux postes à courant alternatif de

tensions supérieures à 1 000 V jusqu’à 245 kV –

Partie 1: Caractéristiques dimensionnelles, mécaniques et électriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.10 ISBN 978-2-8322-2964-4

– 2 – IEC 62231-1:2015 © IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Mechanical and dimensional characteristics . 7
5 Electrical characteristics . 7
6 Designation . 7
7 Marking . 8
8 Tolerances . 8
9 Metal fitting arrangements . 8
Bibliography . 15

Table 1a – Designation and characteristics of composite station post insulators (ref
IEC 60273 Table IV) for IEC 60815-1 class c . 9
Table 1b – Designation and characteristics of composite station post insulators (ref
IEC 60273 Table IV) for IEC 60815-1 class d . 11
Table 2 – Designation and characteristics of composite station post insulators North
American Practice / ANSI . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMPOSITE STATION POST INSULATORS
FOR SUBSTATIONS WITH AC VOLTAGES GREATER
THAN 1 000 V UP TO 245 kV –
Part 1: Dimensional, mechanical and electrical characteristics

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 62231-1 has been prepared by IEC technical committee 36:
Insulators.
The text of this standard is based on the following documents:
FDIS Report on voting
36/372/FDIS 36/373/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.

– 4 – IEC 62231-1:2015 © IEC 2015
A list of all parts in the IEC 62231 series, published under the general title Composite station
post insulators for substations with a.c. voltages greater than 1 000 V up to 245 kV, can be
found on the IEC website.
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.
COMPOSITE STATION POST INSULATORS
FOR SUBSTATIONS WITH AC VOLTAGES GREATER
THAN 1 000 V UP TO 245 kV –
Part 1: Dimensional, mechanical and electrical characteristics

1 Scope
This part of IEC 62231 is applicable to composite station post insulators for substations with
a.c. voltages greater than 1 000 V up to 245 kV.
It also applies to composite station post insulators of similar design used in power stations of
railway systems.
This part of IEC 62231 specifies main dimensions and values for mechanical and electrical
characteristics of composite station post insulators.
NOTE The composite station post insulators covered by this standard are primarily intended for outdoor service,
but can also be used indoor.
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 60815-1:2008, Selection and dimensioning of high-voltage insulators intended for use in
polluted conditions – Part 1: Definitions, information and general principles
IEC 60815-3, Selection and dimensioning of high-voltage insulators intended for use in
polluted conditions – Part 3: Polymer insulators for a.c. systems
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 station post insulator
post insulator consisting of a solid load bearing cylindrical insulating core, a housing and end
fittings attached to the insulating core
[SOURCE: IEC 62231:2006, 3.1]
3.2
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

– 6 – IEC 62231-1:2015 © IEC 2015
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]
3.3
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]
3.4
maximum design cantilever load
MDCL
cantilever load level above which damage to the insulator begins to occur and that should not
be exceeded in service
[SOURCE: IEC 62231:2006, 3.18]
3.5
specified cantilever load
SCL
cantilever load which can be withstood by the insulator when tested under the prescribed
conditions
[SOURCE: IEC 62231:2006, 3.17]
3.6
specified compression load
SCoL
compression load which can be withstood by the insulator when tested under the prescribed
conditions
[SOURCE: IEC 62231:2006, 3.25]
3.7
specified tension load
STL
tension load which can be withstood by the insulator when tested under the prescribed
conditions
[SOURCE: IEC 62231:2006, 3.21]
3.8
specified torsion load
SToL
torsion load level which can be withstood by the insulator when tested under the prescribed
conditions
[SOURCE: IEC 62231:2006, 3.19]

3.9
unified specific creepage distance
USCD
creepage distance of an insulator divided by the maximum operating voltage across the
insulator (for a.c. systems usually the highest voltage for equipment U /√3) which is
m
generally expressed in mm/kV and specified as a minimum value
Note 1 to entry: This definition differs from that of Specific Creepage Distance where the phase-to-phase value of
the highest voltage for the equipment is used. For phase-to-earth insulation, this definition will result in a value that
is √3 times that given by the definition of Specific Creepage Distance in IEC 60815:1986.
[SOURCE: IEC 60815-1:2008, 3.1.6, modified definition and Note 1 to entry]
4 Mechanical and dimensional characteristics
Composite station post insulators are characterized by the following mechanical and
dimensional characteristics, values of which are specified in Tables 1 and 2:
• maximum design cantilever load (MDCL)
• specified cantilever load (SCL),
• specified compression load (SCoL),
• specified tension load (STL),
• specified torsion load (SToL),
• insulator height,
• minimum creepage distance,
• maximum diameter of insulating part,
• metal fitting (end fitting) arrangement (see Clause 9).
Tables 1a and 1b give a minimum creepage distance for each insulator along with the highest
voltage for equipment based on a unified specific creepage distance (USCD) of 34,7 mm/kV
or 43,3 mm/kV (phase-to-earth). This voltage is given for information only. These USCD are
regarded as a representative value of the medium (c) and heavy (d) pollution classes as
defined in IEC 60815-1. Table 2 gives similar information for insulators based on North
American practice, with a USCD of 27,8 mm/kV corresponding to the light pollution class (b).
Creepage distances different to those given in the Tables can also be considered for the
insulators intended for use in various polluted conditions. Further information on USCD and
selection of the insulators for polluted conditions can be found in IEC 60815-1 and 60815-3.
5 Electrical characteristics
Composite station post insulators are characterized by the following electrical characteristics,
values of which are specified in Tables 1 and 2.
• dry lightning impulse withstand voltage,
• wet power frequency withstand voltage.
6 Designation
Composite station post insulators are designated in Tables 1a, 1b and 2 as follows:
• by the letters CSP or NCSP followed by a number indicating the dry lightning impulse
withstand voltage in kilovolts;
• then followed by the letter A or B, representing the pitch circle diameter of top and bottom
metal fittings (A:76mm, B:127mm);

– 8 – IEC 62231-1:2015 © IEC 2015
• and then followed by two numbers separated by a dash, which indicate the maximum
design cantilever load (MDCL) in kilo Newtons with two digits and the minimum creepage
distance in millimetres.
• For example, designation NCSP1050B-06-5030 stands for the composite station post
insulator with a dry lightning impulse withstand voltage of 1 050 kV, a pitch circle diameter
of 127 mm, a maximum design cantilever load of 0,6 kN and a minimum creepage distance
of 5 030 mm.
NOTE Each designation of composite station post insulators means:
CSP: Composite station post insulator
NCSP: Composite station post insulator for North America practice
7 Marking
The composite station post insulator shall be marked in accordance with IEC 62231.
8 Tolerances
The dimensions of creepage distance and maximum diameter of insulating part given in
Tables 1 and 2 are the absolute minima and maxima, respectively; hence no tolerances are
applicable. The tolerances of the insulator heights are given in Tables 1 and 2. Tolerances of
parallelism, eccentricity, and angular deviation shall be in accordance with IEC 62231.
The dimensions and tolerances of insulators supplied in compliance with this standard shall
be shown on the manufacturer’s drawing.
9 Metal fitting arrangements
The metal fitting arrangements shall be in accordance with Tables 1 and 2. Fixing holes shall
be equally spaced on the appropriate pitch circle, which shall be concentric with the axis of
the insulator. Holes in top and bottom fittings shall be in line, unless otherwise specified, and
they shall be so arranged as to permit the use of normal hexagon bolted heads and nuts.

Table 1a – Designation and characteristics of composite station post insulators (ref IEC 60273 Table IV) for IEC 60815-1 class c
Designation Dry Wet power Insulator Minimum Maximum Maximum Specified Specified Specified Metal fitting pitch Highest
lightning frequency height creepage diameter design torsion compressi tension circle diameter voltage
impulse withstand distance of cantilever load on load load for
withstand voltage insulating load equipment
voltage part based on
34,7 mm/
kV USCD
kV kV mm mm mm kN Nm kN kN mm kV
IEC 60815-   Top Bottom
1 Class c
CSP60A-40-240 60 20 190±5 240 220 4,0 1 200 45 70 76 76 12
CSP75A-40-240 75 28 215±5 240 220 4,0 1 200 45 70 76 76 12
CSP95A-50-240 95 38 255±5 240 220 5,0 1 200 45 70 76 76 12
CSP125A-50-480 125 50 305±5 480 220 5,0 1 200 45 70 76 76 24
CSP150A-50-720 150 50 355±5 720 220 5,0 1 200 45 70 76 76 36
CSP170A-40-720 170 70 445±5 720 220 4,0 1 200 45 70 76 76 36
CSP170B-50-720 170 70 445±5 720 240 5,0 3 000 45 80 127 127 36
CSP200A-40-720 200 70 475±5 720 220 4,0 1 200 45 70 76 76 36
CSP200B-50-720 200 70 475±5 720 240 5,0 3 000 45 80 127 127 36
CSP250B-40-1040 250 95 560±5 1 040 220 4,0 1 200 45 70 127 127 52
CSP250B-50-1040 250 95 560±5 1 040 240 5,0 3 000 45 80 127 127 52
CSP325B-24-1450 325 140 770±5 1 450 220 2,4 1 200 30 70 127 127 72.5
CSP325B-32-1450 325 140 770±5 1 450 240 3,2 3 000 110 80 127 127 72.5
CSP450B-32-2460 450 185 1020±5 2 460 240 3,2 3 000 60 80 127 127 123
CSP450B-64-2460 450 185 1020±5 2 460 255 6,4 4 000 100 110 127 127 123
CSP450B-32-2900 450 185 1020±5 2 900 240 3,2 3 000 60 80 127 127 145
CSP450B-32-2900 450 185 1020±5 2 900 255 3,2 4 000 100 110 127 127 145
CSP550B-16-2460 550 230 1 220±5 2 460 240 1,6 3 000 50 80 127 127 123
CSP550B-50-2460 550 230 1 220±5 2 460 255 5,0 4 000 90 110 127 127 123
CSP550B-16-2900 550 230 1 220±5 2 900 240 1,6 3 000 50 80 127 127 145
CSP550B-50-2900 550 230 1 220±5 2 900 255 5,0 4 000 90 110 127 127 145
CSP550B-16-3400 550 230 1 220±5 3 400 240 1,6 3 000 50 80 127 127 170
CSP550B-50-3400 550 230 1 220±5 3 400 255 5,0 4 000 90 110 127 127 170

– 10 – IEC 62231-1:2015 © IEC 2015

Designation Dry Wet power Insulator Minimum Maximum Maximum Specified Specified Specified Metal fitting pitch Highest
lightning frequency height creepage diameter design torsion compressi tension circle diameter voltage
impulse withstand distance of cantilever load on load load for
withstand voltage insulating load equipment
voltage part based on
34,7 mm/
kV USCD
kV kV mm mm mm kN Nm kN kN mm kV
IEC 60815-   Top Bottom
1 Class c
CSP650B-08-2900 650 275 1 500±5 2 900 240 0,8 3 000 25 80 127 127 145
CSP650B-50-2900 650 275 1 500±5 2 900 255 5,0 4 000 50 110 127 127 145
CSP650B-80-2900 650 275 1 500±5 2 900 290 8,0 6 000 110 110 127 127 145
CSP650B-08-3400 650 275 1 500±5 3 400 240 0,8 3 000 25 80 127 127 170
CSP650B-50-3400 650 275 1 500±5 3 400 255 5,0 4 000 50 110 127 127 170
CSP650B-80-3400 650 275 1 500±5 3 400 290 8,0 6 000 110 110 127 127 170
CSP750B-08-3400 750 325 1 700±5 3 400 240 0,8 3 000 22 80 127 127 170
CSP750B-40-3400 750 325 1 700±5 3 400 255 4,0 4 000 45 110 127 127 170
CSP750B-50-3400 750 325 1 700±5 3 400 290 5,0 6 000 80 110 127 127 170
CSP750B-08-4900 750 325 1 700±5 4 900 240 0,8 3 000 22 80 127 127 245
CSP750B-40-4900 750 325 1 700±5 4 900 255 4,0 4 000 45 110 127 127 245
CSP750B-80-4900 750 325 1 700±5 4 900 290 8,0 6 000 80 110 127 127 245
CSP850B-08-4900 850 360 1 900±5 4 900 240 0,8 3 000 20 80 127 127 245
CSP850B-32-4900 850 360 1 900±5 4 900 255 3,2 4 000 40 110 127 127 245
CSP850B-80-4900 850 360 1 900±5 4 900 290 8,0 6 000 70 110 127 127 245
CSP950B-16-4900 950 360 2 100±5 4 900 290 1,6 6 000 80 110 127 127 245
NOTE 1 Specific requirements on acceptable deflection of composite station post insulators on the actual application shall be discussed between users and suppliers.
NOTE 2 For applications where the deflection of the post under load is critical, refer to the manufacturer’s load deflection curve to ensure suitability. In some cases an
insulator of higher strength rating may be selected to provide adequate rigidity.
NOTE 3 For applications where two different types of force may be applied to the insulator simultaneously, e.g. a compressive and a cantilever load, the manufacturer’s
combined load curve may be consulted to ensure suitability.

Table 1b – Designation and characteristics of composite station post insulators (ref IEC 60273 Table IV) for IEC 60815-1 class d
Designation Dry Wet power Insulator Minimum Maximum Maximum Specified Specified Specified Metal fitting pitch Highest
lightning frequency height creepage diameter design torsion compressi tension circle diameter voltage
impulse withstand distance of cantilever load on load load for
withstand voltage insulating load equipment
voltage part based on
43,3 mm/
kV USCD
kV kV mm mm mm kN Nm kN kN mm kV
IEC 60815-   Top Bottom
1 Class d
CSP60A-40-300 60 20 190±5 300 220 4,0 1 200 45 70 76 76 12
CSP75A-40-240 75 28 215±5 240 220 4,0 1 200 45 70 76 76 12
CSP95A-50-300 95 38 255±5 300 220 5,0 1 200 45 70 76 76 12
CSP125A-50-600 125 50 305±5 600 220 5,0 1 200 45 70 76 76 24
CSP150A-50-900 150 50 355±5 900 220 5,0 1 200 45 70 76 76 36
CSP170A-40-900 170 70 445±5 900 220 4,0 1 200 45 70 76 76 36
CSP170B-50-900 170 70 445±5 900 240 5,0 3 000 45 80 127 127 36
CSP200A-40-900 200 70 475±5 900 220 4,0 1 200 45 70 76 76 36
CSP200B-50-900 200 70 475±5 900 240 5,0 3 000 45 80 127 127 36
CSP250B-40-1300 250 95 560±5 1 300 220 4,0 1 200 45 70 127 127 52
CSP250B-50-1300 250 95 560±5 1 300 240 5,0 3 000 45 80 127 127 52
CSP325B-24-1812 325 140 770±5 1 812 220 2,4 1 200 30 70 127 127 72.5
CSP325B-32-1812 325 140 770±5 1 812 240 3,2 3 000 110 80 127 127 72.5
CSP450B-32-3075 450 185 1020±5 3 075 240 3,2 3 000 60 80 127 127 123
CSP450B-64-3075 450 185 1020±5 3 075 255 6,4 4 000 100 110 127 127 123
CSP450B-32-3625 450 185 1020±5 3 625 240 3,2 3 000 60 80 127 127 145
CSP450B-64-3625 450 185 1020±5 3 625 255 6,4 4 000 100 110 127 127 145
CSP550B-16-3075 550 230 1 220±5 3 075 240 1,6 3 000 50 80 127 127 123
CSP550B-50-3075 550 230 1 220±5 3 075 255 5,0 4 000 90 110 127 127 123
CSP550B-16-3625 550 230 1 220±5 3 625 240 1,6 3 000 50 80 127 127 145
CSP550B-50-3625 550 230 1 220±5 3 625 255 5,0 4 000 90 110 127 127 145
CSP550B-16-4250 550 230 1 220±5 4 250 240 1,6 3 000 50 80 127 127 170
CSP550B-50-4250 550 230 1 220±5 4 250 255 5,0 4 000 90 110 127 127 170

– 12 – IEC 62231-1:2015 © IEC 2015

Designation Dry Wet power Insulator Minimum Maximum Maximum Specified Specified Specified Metal fitting pitch Highest
lightning frequency height creepage diameter design torsion compressi tension circle diameter voltage
impulse withstand distance of cantilever load on load load for
withstand voltage insulating load equipment
voltage part based on
43,3 mm/
kV USCD
kV kV mm mm mm kN Nm kN kN mm kV
IEC 60815-   Top Bottom
1 Class d
CSP650B-08-3625 650 275 1 500±5 3 625 240 0,8 3 000 25 80 127 127 145
CSP650B-50-3625 650 275 1 500±5 3 625 255 5,0 4 000 50 110 127 127 145
CSP650B-80-3625 650 275 1 500±5 3 625 290 8,0 6 000 110 110 127 127 145
CSP650B-08-4250 650 275 1 500±5 4 250 240 0,8 3 000 25 80 127 127 170
CSP650B-50-4250 650 275 1 500±5 4 250 255 5,0 4 000 50 110 127 127 170
CSP650B-80-4250 650 275 1 500±5 4 250 240 8,0 6 000 110 110 127 127 170
CSP750B-08-4250 750 325 1 700±5 4 250 290 0,8 3 000 22 80 127 127 170
CSP750B-40-4250 750 325 1 700±5 4 250 255 4,0 4 000 45 110 127 127 170
CSP750B-50-4250 750 325 1 700±5 4 250 290 5,0 6 000 80 110 127 127 170
CSP750B-08-6125 750 325 1 700±5 6 125 240 0,8 3 000 22 80 127 127 245
CSP750B-40-6125 750 325 1 700±5 6 125 255 4,0 4 000 45 110 127 127 245
CSP750B-80-6125 750 325 1 700±5 6 125 290 8,0 6 000 80 110 127 127 245
CSP850B-08-6125 850 360 1 900±5 6 125 240 0,8 3 000 20 80 127 127 245
CSP850B-32-6125 850 360 1 900±5 6 125 255 3,2 4 000 40 110 127 127 245
CSP850B-80-6125 850 360 1 900±5 6 125 290 8,0 6 000 70 110 127 127 245
CSP950B-16-6125 950 360 2 100±5 6 125 290 1,6 6 000 80 110 127 127 245
NOTE 1 Specific requirements on acceptable deflection of composite station post insulators on the actual application shall be discussed between users and suppliers.
NOTE 2 For applications where the deflection of the post under load is critical, refer to the manufacturer’s load deflection curve to ensure suitability. In some cases an insulator
of higher strength rating may be selected to provide adequate rigidity.
NOTE 3 For applications where two different types of force may be applied to the insulator simultaneously, e.g. a compressive and a cantilever load, the manufacturer’s
combined load curve may be consulted to ensure suitability.

Table 2 – Designation and characteristics of composite station post insulators
North American Practice / ANSI
Designation Dry Wet power Insulator Minimum Maximum Maximum Specified Specified Specified Metal fitting pitch Highest
lightning frequency height creepage diameter design torsion compressi tension circle diameter voltage
impulse withstand distance of cantilever load on load load for
withstand voltage insulating load equipment
voltage part based on
27,8 mm/
kV USCD
kV kV mm mm mm kN Nm kN kN mm kV
Top Bottom
NCSP95A-36-267 95 30 190±0,8 267 200 3,6 700 31,1 31,1 76 76 12
NCSP95B-71-267 95 30 254±0,8 267 200 7,1 700 71,2 71,2 127 127 12
NCSP110A-36-274 110 40 254±0,8 274 200 3,6 700 37,8 37,8 76 76 12
NCSP110B-71-394 110 45 305±0,8 394 200 7,1 700 71,2 71,2 127 127 24
NCSP150A-36-610 150 60 357±0,8 610 200 3,6 700 44,5 44,5 76 76 36
NCSP150B-71-610 150 60 381±0,8 610 200 7,1 700 71,2 71,2 127 127 36
NCSP200A-36-864 200 80 457±0,8 864 200 3,6 700 44,5 44,5 76 76 52
NCSP200B-71-940 200 80 508±0,8 940 200 7,1 700 71,2 71,2 127 127 52
NCSP250A-36-1092 250 100 559±0,8 1 092 200 3,6 700 44,5 44,5 76 76 52
NCSP250B-71-1092 250 100 610±0,8 1 092 200 7,1 700 71,2 71,2 127 127 52
NCSP350A-27-1829 350 145 762±0,8 1 829 240 2,7 700 71,2 71,2 76 76 72.5
NCSP350B-27-1829 350 145 762±0,8 1 829 240 2,7 700 71,2 71,2 127 127 72.5
NCSP350B-36-1524 350 145 762±0,8 1 524 240 3,6 700 77,8 77,8 127 127 72.5
NCSP550B-30-2515 550 230 1 143±1,6 2 515 240 3,0 1 600 77,8 77,8 127 127 145
NCSP550B-46-2515 550 230 1 143±1,6 2 515 240 4,6 1 600 77,8 77,8 127 127 145
NCSP650B-25-2946 650 275 1 372±1,6 2 946 240 2,5 1 600 77,8 77,8 127 127 170
NCSP650B-39-2946 650 275 1 372±1,6 2 946 240 3,9 2 000 77,8 77,8 127 127 170

– 14 – IEC 62231-1:2015 © IEC 2015

Desig
...