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IEC 61952-1
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
Insulators for overhead lines – Composite line post insulators for AC systems
with a nominal voltage greater than 1 000 V –
Part 1: definitions, end fittings and designations
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IEC 61952-1
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
Insulators for overhead lines – Composite line post insulators for AC systems
with a nominal voltage greater than 1 000 V –
Part 1: definitions, end fittings and designations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.080.10; 29.240.20 ISBN 978-2-8322-6511-6
– 2 – IEC 61952-1:2019 © IEC 2019
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Mechanical, dimensional and electrical characteristics . 7
Characteristics . 7
Maximum design cantilever load (MDCL) and specified cantilever load (SCL) . 8
Minimum lightning impulse withstand voltage class (BIL) . 8
Standard coupling codes . 8
Standard base-plate codes . 18
5 Line post insulator designation . 22
6 Marking . 23
Bibliography . 32
Table 1 – Types of couplings . 9
Table 2 – Types of base plates . 19
Table 3 – Designation and characteristic of composite Line post insulators (IEC
practice) for IEC 60815-3, Class b . 24
Table 4 – Designation and characteristic of composite line post insulators (ANSI
practice) . 28
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATORS FOR OVERHEAD LINES – COMPOSITE LINE
POST INSULATORS FOR AC SYSTEMS WITH A NOMINAL
VOLTAGE GREATER THAN 1 000 V –
Part 1: Definitions, end fittings and designations
FOREWORD
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International Standard IEC 61952-1 has been prepared by IEC technical committee 36:
Insulators.
The text of this standard is based on the following documents:
FDIS Report on voting
36/435/FDIS 36/441/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.
A list of all parts in the IEC 61952 series, published under the general title Insulators for
overhead lines – Composite line post insulators for AC systems with a nominal voltage greater
than 1 000 V, can be found on the IEC website.
– 4 – IEC 61952-1:2019 © IEC 2019
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.
A bilingual version of this publication may be issued at a later date.
INTRODUCTION
This part of IEC 61952 is intended to give the main mechanical and dimensional characteristics
of composite line post insulators and their fittings in order to ensure their interchangeability.
Since line post insulators are usually subjected to combined loads (for example vertical due to
the conductor plus compressive and lateral due to the pole being at a line corner or turn), only
the MDCL is given as a specified characteristic for the mechanical strength of the insulator.
Furthermore, composite line post insulators are often used in a braced configuration for higher
voltages and mechanical loads. In these configurations the overall strength depends on the
components and geometry of the whole assembly – including notably the buckling strength of
the line post component which depends more on the core dimensions and flexibility than on
ultimate flexural strength.
In order to address the matter of the strength of composite line post insulators under combined
or complex loads some information is already given in Annex B of IEC 61952:2008 and by the
IEEE [2] . It is intended to expand on this information in a second part of IEC 61952 which will
give application guidelines and examples for common line post usage scenarios.
____________
Numbers in square brackets refer to the bibliography.
– 6 – IEC 61952-1:2019 © IEC 2019
INSULATORS FOR OVERHEAD LINES – COMPOSITE LINE
POST INSULATORS FOR AC SYSTEMS WITH A NOMINAL
VOLTAGE GREATER THAN 1 000 V –
Part 1: Definitions, end fittings and designations
1 Scope
This part of IEC 61952 is applicable to composite line post insulators for AC overhead lines with
a nominal voltage greater than 1 000 V and a frequency not greater than 100 Hz.
It also applies to line post insulators of similar design used in substations or on electric traction
lines.
This document applies to line post insulators of composite type, generally with metallic
couplings, with and without a base plate. It also applies to such insulators when used in complex
structures. It does not apply to hollow insulators adapted for use as line post insulators.
The object of this document is to specify the main dimensions of the couplings to be used on
the composite line post insulators in order to permit the assembly of insulators or fittings
supplied by different manufacturers and to allow, whenever practical, interchangeability with
existing installations.
It also specifies a standard designation system for composite line post insulators.
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 60050-471, International Electrotechnical Vocabulary – Part 471: Insulators
IEC 60071-1, Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 61952:2008, Insulators for overhead lines – Composite line post insulators for A.C. systems
with a nominal voltage greater than 1 000 V – Definitions, test methods and acceptance criteria
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-471 and
IEC 61952 and the following 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
coupling
part of the end fitting designed for attachment of the composite line post insulator to line
equipment, supporting structures, base plates or other insulators
3.2
core diameter
nominal diameter of the load-bearing core of the insulator
3.3
line end fitting
fitting at the end of the line post insulator to which the conductor or other live equipment is to
be attached
Note 1 to entry: Line end fitt
...