Insulators for overhead lines with a nominal voltage above 1000 V - Ceramic insulators for AC systems - Characteristics of insulator units of the long rod type

IEC 60433:2021 is applicable to string insulator units of the long rod type with insulating parts of ceramic material intended for use in AC overhead power lines with a nominal voltage greater than 1000 V and a frequency not greater than 100 Hz. It is also applicable to insulators of similar design, used in substations. This document is applicable to ceramic string insulator units of the long rod type, either with a clevis end fitting at both ends for coupling with a tongue, or with a socket end fitting at both ends for coupling with a pin ball. The object of this document is to prescribe specified values for electrical and mechanical characteristics, and for the principal dimensions of ceramic string insulator units of the long rod type. This fourth edition cancels and replaces the third edition published in 1998. This edition includes the following significant technical changes with respect to the previous edition:
- wording in Scope changed from "should" to "are intended to";
- new normative references added;
- title of Clause 4 amended, new Note 4 added;
- Table 1 expanded to include more specified mechanical failing loads.

Isolateurs pour lignes aériennes de tension nominale supérieure à 1 000 V - Isolateurs en céramique pour réseaux à tension alternative - Caractéristiques des éléments d'isolateurs du type à long fût

L'IEC 60433:2021 s'applique aux éléments de chaînes d'isolateurs du type à long fût ayant des parties isolantes en matière céramique destinés aux lignes aériennes fonctionnant en courant alternatif à une tension nominale supérieure à 1 000 V et à une fréquence au plus égale à 100 Hz. Elle s'applique également aux isolateurs du même type utilisés dans les postes. Le présent document s'applique aux éléments de chaînes d’isolateurs en céramique du type à long fût ayant à chaque extrémité soit une chape destinée à recevoir un tenon, soit un logement de rotule pour assemblage avec une tige à rotule. Le présent document a pour objet de prescrire des valeurs spécifiées pour les caractéristiques électriques et mécaniques et pour les principales dimensions des éléments de chaînes d'isolateurs en céramique du type à long fût. Cette quatrième édition annule et remplace la troisième édition parue en 1998. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- reformulation du domaine d'application: "il convient d’utiliser les caractéristiques mécaniques ainsi que les longueurs L (voir Article 4) de la présente norme " remplacé par "les caractéristiques mécaniques ainsi que les longueurs L (voir Article 4) de la présente norme sont prévues pour être utilisées";
- ajout de nouvelles références normatives;
- modification du titre de l'Article 4, ajout d'une nouvelle Note 4;
- Le Tableau 1 a été étoffé pour intégrer un plus grand nombre de charges de rupture mécanique spécifiées.

General Information

Status
Published
Publication Date
11-Jan-2021
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
12-Jan-2021
Ref Project

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IEC 60433
Edition 4.0 2021-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulators for overhead lines with a nominal voltage above 1 000 V – Ceramic
insulators for AC systems – Characteristics of insulator units of the long rod
type
Isolateurs pour lignes aériennes de tension nominale supérieure a 1 000 V –
Isolateurs en céramique pour réseaux à tension alternative – Caractéristiques
des éléments d'isolateurs du type a long fût
IEC 60433:2021-01(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60433
Edition 4.0 2021-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Insulators for overhead lines with a nominal voltage above 1 000 V – Ceramic
insulators for AC systems – Characteristics of insulator units of the long rod
type
Isolateurs pour lignes aériennes de tension nominale supérieure a 1 000 V –
Isolateurs en céramique pour réseaux à tension alternative – Caractéristiques
des éléments d'isolateurs du type a long fût
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.080.10; 29.240.20 ISBN 978-2-8322-9204-4

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 – IEC 60433:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 6

4 Characteristics, dimensions and type of long rod insulators ............................................. 6

5 Designation and marking ................................................................................................. 6

Bibliography .......................................................................................................................... 11

Figure 1 – Long rod insulator with clevis couplings, type C ................................................... 10

Figure 2 – Long rod insulator with socket couplings, type B .................................................. 10

Table 1 – Specified values for long rod insulators ................................................................... 8

---------------------- Page: 4 ----------------------
IEC 60433:2021 © IEC 2021 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATORS FOR OVERHEAD LINES
WITH A NOMINAL VOLTAGE ABOVE 1 000 V –
CERAMIC INSULATORS FOR AC SYSTEMS –
CHARACTERISTICS OF INSULATOR UNITS OF THE LONG ROD TYPE
FOREWORD

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International Standard IEC 60433 has been prepared by IEC technical committee 36:

Insulators.

This fourth edition cancels and replaces the third edition published in 1998. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) wording in Scope changed from "should" to "are intended to";
b) new normative references added;
c) title of Clause 4 amended, new Note 4 added;
d) Table 1 expanded to include more specified mechanical failing loads.
---------------------- Page: 5 ----------------------
– 4 – IEC 60433:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
36/498/FDIS 36/500/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60433:2021 © IEC 2021 – 5 –
INSULATORS FOR OVERHEAD LINES
WITH A NOMINAL VOLTAGE ABOVE 1 000 V –
CERAMIC INSULATORS FOR AC SYSTEMS –
CHARACTERISTICS OF INSULATOR UNITS OF THE LONG ROD TYPE
1 Scope

This International Standard is applicable to string insulator units of the long rod type with

insulating parts of ceramic material intended for use in AC overhead power lines with a

nominal voltage greater than 1 000 V and a frequency not greater than 100 Hz. It is also

applicable to insulators of similar design, used in substations.

This document is applicable to ceramic string insulator units of the long rod type, either with a

clevis end fitting at both ends for coupling with a tongue, or with a socket end fitting at both

ends for coupling with a pin ball.

The object of this document is to prescribe specified values for electrical and mechanical

characteristics, and for the principal dimensions of ceramic string insulator units of the long

rod type.

This document is applicable to string insulator units for use on overhead lines situated in

lightly polluted areas, and the creepage distances given in Table 1 have been established

accordingly, using the IEC TS 60815-2 recommendation of 27,8 mm/kV for SPS class.

However, shorter creepage distances are applicable for use in some non-polluted areas. If

specific operating conditions require or allow non-standard (longer or shorter) creepage

distances, the mechanical characteristics as well as the lengths L (see Clause 4) of this

document are intended to be used unless the need for exceptionally long creepage distances

requires values of L greater than those given in Table 1. In the case of special requirements,

e.g. very heavy polluted areas and for other particular or extreme environmental conditions, it

may be necessary for certain dimensions to be changed.

As far as reasonably applicable, this document is also applicable to be applied to similar

insulator units outside the scope of this standard, such as insulators for electric traction lines.

This document does not include tests on insulators and dimensions of end fittings.

Ball and socket couplings are covered by IEC 60120, clevis and tongue couplings by

IEC 60471.

NOTE 1 For the definition of site pollution severity, see applicable part of IEC TS 60815.

NOTE 2 The term "ceramic" is used in this document to refer to porcelain materials and, contrary to North

American practice, does not include glass.
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 60383-1, Insulators for overhead lines with a nominal voltage above 1 000 V – Part 1:

Ceramic or glass insulator units for AC systems – Definitions, test methods and acceptance

criteria
---------------------- Page: 7 ----------------------
– 6 – IEC 60433:2021 © IEC 2021
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
long rod insulator

suspension or tension insulator consisting of an approximately cylindrical insulating part

provided with sheds and equipped at the ends with external metal fittings

Note 1 to entry: The insulator is designed in such a manner that the shortest puncture path through solid

insulating material is at least equal to half the arcing distance. Therefore it is a class A insulator according to

IEC 60383-1.
4 Characteristics, dimensions and type of long rod insulators

String insulator units of the long rod type are characterised by the following specified

characteristics:
– the standard lightning impulse withstand voltage (see IEC 60071-1);
– the wet power frequency withstand voltage (see IEC 60071-1);
– the tensile mechanical failing load;
– the maximum nominal length L of the insulator;
– the maximum nominal diameter D of the insulating part;
– the minimum nominal creepage distance;
– the standard coupling.

The corresponding values are specified in Table 1. The minimum nominal creepage distances

are based on a unified specific creepage distance of 27,8 mm/kV for the lowest value of the

highest voltage for equipment corresponding to the specified value of the standard lightning

impulse withstand (in accordance with IEC 60071-1).

NOTE 1 The tolerances given in IEC 60383-1 are applicable to all the dimensions in Table 1, even if the

adjectives "minimum" or "maximum" are used before the term "nominal".

NOTE 2 Dry lightning impulse withstand voltage and wet power frequency withstand voltage are specified in

Table 1 for single unit string insulators. Values of withstand voltages of insulator strings consisting of more than

one unit are not contained in this document.

NOTE 3 The rod diameter is not specified since it depends on the mechanical characteristics of the insulating

material. Information on the definition and classification of ceramic insulating materials can be found in

IEC 60672-1 and IEC 60672-3.

NOTE 4 Examples of shed profile are given in Clause 8, “Choice of profile” of IEC TS 60815-2:2008.

5 Designation and marking

Long rod insulators are designated in Table 1 by the letter L, followed by a figure indicating

the specified mechanical failing load in kilonewtons. Then follows the letter B or C indicating

socket or clevis coupling respectively, followed by the value of the lightning impulse withstand

voltage in kilovolts.
---------------------- Page: 8 ----------------------
IEC 60433:2021 © IEC 2021 – 7 –
EXAMPLE:
L 160 B 550 indicates:
L: long rod insulator;
160: specified mechanical failing load, tension, 160 kN;
B: socket coupling;
550: dry lightning impulse withstand voltage 550 kV.

The insulators shall be marked either on the upper shed or on the metal parts with the name

or trade mark of the manufacturer and the year of manufacture. In addition, each unit shall be

marked with the specified mechanical failing load, by using the first part of the designation; for

instance, the insulator shall be marked L 160 for the units with 160 kN specified mechanical

failing load.
These markings shall be legible and indelible.

Figure 1 shows a long rod insulator with clevis couplings. Figure 2 shows a long rod insulator

with socket couplings.
---------------------- Page: 9 ----------------------
– 8 – IEC 60433:2021 © IEC 2021
Table 1 – Specified values for long rod insulators
Coupling B Coupling C

Designation Standard Wet power Specified Maximum Minimum Standard Maximum Standard coupling size

Maximum

lightning frequency mechanical nominal nominal creepage nominal coupling size nominal (coupling pin diameter,

impulse withstand failing load diameter D on distance length L (pin diameter, length L see IEC 60471 –

withstand voltage the insulating (27.8 mm/kV, see IEC 60120) non-preferred
voltage part see Clause 4) sizes in brackets)
kV kV kN mm mm mm mm
L 40 B/C 170 170 70 40 160 576 380 11 400 13L
L 60 B/C 170 170 70 60 160 576 400 11 420 13L
L 100 B/C 170 170 70 100 180 576 450 16 475 19L (16L)
L 100 B/C 250 250 95 100 180 832 580 16 605 19L (16L)
L 100 B/C 325 325 140 100 180 1 160 870 16 900 19L (16 L)
L 100 B/C 450 450 185 100 180 1 968 1 085 16 1 120 19L (16L)
L 100 B/C 550 550 230 100 180 1 968 1 240 16 1 270 19L (16L)
L 120 B/C 325 325 140 120 200 1 160 870 16 905 19L (16L)
L 120 B/C 450 450 185 120 200 1 968 1 085 16 1 120 19L (16L)
L 120 B/C 550 550 230 120 200 1 968 1 240 16 1 275 19L (16L)
L 120 B/C 650 650 275 120 200 2 320 1 430 16 1 465 19L (16L)
L 160 B/C 325 325 140 160 210 1 160 885 20 920 19L
L 160 B/C 450 450 185 160 210 1 968 1 100 20 1 135 19L
L 160 B/C 550 550 230 160 210 1 968 1 255 20 1 290 19L
L 160 B/C 650 650 275 160 210 2 320 1 445 20 1 465 19L
L 210 B/C 325 325 140 210 220 1 160 905 20 940 22L
L 210 B/C 450 450 185 210 220 1 968 1 120 20 1 155 22L
L 210 B/C 550 550 230 210 220 1 968 1 275 20 1 310 22L
L 210 B/C 650 650 275 210 220 2 320 1 465 20 1 500 22L
---------------------- Page: 10 ----------------------
IEC 60433:2021 © IEC 2021 – 9 –
Coupling B Coupling C

Designation Standard Wet power Specified Maximum Minimum Maximum Standard Maximum Standard coupling size

lightning frequency mechanical nominal nominal creepage nominal coupling size nominal (coupling pin diameter,

impulse withstand failing load diameter D on distance length L (pin diameter, length L see IEC 60471 –

withstand voltage the insulating (27.8 mm/kV, see IEC 60120) non-preferred
voltage part see Clause 4) sizes in brackets)
kV kV kN mm mm mm mm
L 250 B/C 550 550 230 250 230 1 968 1 305 24 1 335 22L
L 250 B/C 650 650 275 250 230 2 320 1 500 24 1 530 22L
L 300 B/C 550 550 230 300 240 1 968 1 330 24 1 365 25L
L 300 B/C 650 650 275 300
...

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