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IEC TR 61597:2021

(Main)

Overhead electrical conductors - Calculation methods for stranded bare conductors

Overhead electrical conductors - Calculation methods for stranded bare conductors

IEC 61597:2021(E) which is a Technical Report provides information with regard to conductors specified in IEC 61089 and other aluminium and aluminium steel conductors. Such information includes properties of conductors and useful methods of calculation. The following chapters are included in this document.
– current carrying capacity of conductors: Calculation method and typical example
– alternating current resistance, inductive and capacitive reactances
– elongation of conductors: Thermal and stress-strain data
– conductor creep
– loss of strength of aluminium wires due to high temperatures
It is noted that this document does not discuss all theories and available methods for calculating conductor properties, but provides users with simple methods that provide acceptable accuracies.
This second edition cancels and replaces the first edition published in 1995. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Addition of Clause 2 and Clause 3 since the “Normative references” and “Terms and definitions” clauses are mandatory elements of the text according to the new IEC template.
b) In Clause 6, addition of new kinds of aluminium alloy and aluminium clad steel and their values of temperature coefficients of resistance.
c) In Clause 6, addition of guidelines for the calculation of AC resistance taken into account hysteresis and eddy current losses.
d) In Clause 7, addition of the values of coefficient of linear expansion of aluminium alloy conductor aluminium-clad steel reinforced series.
e) Deletion of Clause 8 “Calculation of maximum conductor length on drums” in the last version.
f) Annex A, replaced by “A practical example of CCC calculation”.
g) Annex B, replaced by “Indicative conditions for CCC calculation”.

General Information

Status
Published
Publication Date
28-Jun-2021
ICS
29.240.20 - Power transmission and distribution lines
Technical Committee
TC 7 - Overhead electrical conductors
Drafting Committee
MT 1 - TC 7/MT 1
Current Stage
PPUB - Publication issued
Start Date
23-Jul-2021
Completion Date
29-Jun-2021
Ref Project

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IEC TR 61597:2021 - Overhead electrical conductors - Calculation methods for stranded bare conductors
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IEC TR 61597
®

Edition 2.0 2021-06
TECHNICAL
REPORT



Overhead electrical conductors – Calculation methods for stranded bare
conductors
IEC TR 61597:2021-06(en)

---------------------- Page: 1 ----------------------
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IEC TR 61597

®


Edition 2.0 2021-06




TECHNICAL



REPORT



















Overhead electrical conductors – Calculation methods for stranded bare

conductors


























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ICS 29.240.20 ISBN 978-2-8322-9938-8




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® Registered trademark of the International Electrotechnical Commission

---------------------- Page: 3 ----------------------
– 2 – IEC TR 61597:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols, units and abbreviated terms . 7
4.1 Symbols and units. 7
4.2 Abbreviated terms . 8
5 Current carrying capacity . 8
5.1 General . 8
5.2 Heat balance equation . 8
5.3 Calculation method . 9
5.4 Joule effect . 9
5.5 Solar heat gain . 9
5.6 Radiated heat loss .
...

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