IEC TS 62818-1:2024

Conductors for overhead lines - Fiber reinforced composite core used as supporting member material - Part 1: Polymeric matrix composite cores

IEC TS 62818-1:2024 establishes a system of fiber reinforced composite core used as supporting member material in conductors for overhead lines which may be used as the basis for specifications. This document is applicable to fiber reinforced composite core, with polymeric matrix, used as supporting member material in conductors for overhead lines.
This document gives guidance on:
- defining the common terms used for fiber reinforced composite core with polymeric matrix,
- prescribing common methods and recommendations to characterize the properties of fiber reinforced composite core based on single or multi-wires with PMC (Polymeric Matrix Composite) used as supporting member material in conductors,
- prescribing or recommending acceptance or failure criteria when applicable.
These tests, criteria and recommendations are intended to ensure a satisfactory use and quality under normal operating and environmental conditions.
This document does not apply to compliance criteria which may be required but indicative values could be given in Annexes for guidance.

General Information

• Status: Published
• Publication Date: 11-Dec-2024
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: TC 7 - Overhead electrical conductors
• Drafting Committee: PT 62818 - TC 7/PT 62818
• Current Stage: PPUB - Publication issued
• Start Date: 06-Dec-2024
• Completion Date: 12-Dec-2024

Standards Content (Sample)

IEC TS 62818-1 ®
Edition 1.0 2024-12
TECHNICAL
SPECIFICATION
colour
inside
Conductors for overhead lines – Fiber reinforced composite core used as
supporting member material –
Part 1: Polymeric matrix composite cores

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IEC TS 62818-1 ®
Edition 1.0 2024-12
TECHNICAL
SPECIFICATION
colour
inside
Conductors for overhead lines – Fiber reinforced composite core used as

supporting member material –
Part 1: Polymeric matrix composite cores

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.240.20  ISBN 978-2-8322-6983-1

– 2 – IEC TS 62818-1:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Symbols and abbreviated terms . 10
5 Requirements . 10
5.1 Composite core manufacturing . 10
5.2 Composite core sampling and tests . 10
5.2.1 General . 10
5.2.2 Type tests . 11
5.2.3 Sample tests . 11
5.2.4 Routine tests . 11
5.3 Composite core traceability and packaging . 11
6 Composite core thermal performance . 11
6.1 General . 11
6.2 Maximum continuous temperature of the composite core: T . 12
C,CORE
6.3 Temperature limit for use in peak load of the composite core: T . 12
P,CORE
7 Tests for the composite core characterization . 12
7.1 Appearance . 12
7.2 Diameter . 12
7.2.1 Diameter measurement for single wire composite core . 12
7.2.2 Diameter measurement for multi-wires composite core . 13
7.3 Lay length measurement for multi-wires composite core . 14
7.4 Protective layer thickness . 15
7.5 DC electrical resistance . 15
7.6 Mass per unit length . 15
7.7 Tensile test . 15
7.8 Bending test . 16
7.8.1 General . 16
7.8.2 Mandrel test . 16
7.8.3 Coiling test . 17
7.9 Measurement of Glass transition temperature (by DMA). 18
7.10 Coefficient of thermal expansion . 19
7.10.1 Sample preparation . 19
7.10.2 Procedure . 19
7.11 T determination . 20
onset Thermolysis
7.12 Isothermal ageing . 21
7.12.1 General . 21
7.12.2 Product stability at T . 21
C,CORE
7.12.3 Product stability at T . 22
P,CORE
8 Optional tests . 22
8.1 Twisting test . 22
8.2 Crushing test . 23
8.3 Salt fog test . 24

8.4 Fiber volume ratio . 24
8.4.1 General . 24
8.4.2 TGA method . 24
8.4.3 Calculated method . 26
8.5 Porosity . 26
8.6 UV ageing . 27
Annex A (normative) Testing table . 28
Annex B (normative) Arrhenius thermal ageing test . 29
B.1 General . 29
B.2 Ageing temperatures, number of samples and picking frequency . 29
B.2.1 Overview . 29
B.2.2 Definition of the testing plan . 29
B.3 Test method . 30
Annex C (informative) For more info on composite core T . 34
g
Bibliography . 35

Figure 1 – Measurement of multi-wire core diameter . 13
Figure 2 – Illustration of the mandrel test . 17
Figure 3 – Illustration of the coiling test . 18
Figure 4 – CTE test setup . 19
Figure 5 – Illustration for T determination . 20
onset thermolysis
Figure 6 – Illustration of the twisting test . 23
Figure 7 – Illustration of the crushing test . 24
Figure 8 – TGA curve for the measurement of weight loss versus temperature . 25
Figure B.1 – Example of decay curves . 31
Figure B.2 – Example of decay curves and identification of times to end-point
according to method A . 31
Figure B.3 – Example of decay curves and identification of times to end-point
according to method B . 32
Figure B.4 – Example of Arrhenius curve with the long-term extrapolation to 40 years . 32
Figure C.1 – Example of storage modulus and loss modulus curves and Tg point

determination . 34

Table 1 – Testing table for core diameter measurement by core type . 14
Table 2 – DMA testing specification . 18
Table A.1 – Tests on composite core . 28

– 4 – IEC TS 62818-1:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONDUCTORS FOR OVERHEAD LINES – FIBER REINFORCED
COMPOSITE CORE USED AS SUPPORTING MEMBER MATERIAL –

Part 1: Polymeric matrix composite cores

FOREWORD
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