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BSI PD IEC TR 61597:2021

BSI PD IEC TR 61597:2021

$167.15

Overhead electrical conductors. Calculation methods for stranded bare conductors

Published By Publication Date Number of Pages
BSI 2021 34
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This document, 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.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
3 Terms and definitions
9 4 Symbols, units and abbreviated terms
4.1 Symbols and units
10 4.2 Abbreviated terms
5 Current carrying capacity
5.1 General
5.2 Heat balance equation
11 5.3 Calculation method
5.4 Joule effect
5.5 Solar heat gain
5.6 Radiated heat loss
12 5.7 Convection heat loss
5.8 Method to calculate current carrying capacity (CCC)
5.9 Determination of the maximum permissible aluminium temperature
13 5.10 Calculated values of current carrying capacity
6 Alternating current resistance, Inductive and capacitive reactances
6.1 General
6.2 Alternating current (AC) resistance
14 6.3 Inductive reactance
15 Tables
Table 1 – Values of Kg for inductive reactance calculations
16 6.4 Capacitive reactance
7 Elongation of stranded conductors
7.1 General
17 7.2 Thermal elongation
19 Table 2 – Coefficient of linear expansion β of inhomogeneous conductors designated Ax/Sxy
20 7.3 Stress-strain properties
Table 3 – Coefficient of linear expansion β of inhomogeneous conductors designated Ax/20SA
22 7.4 Assessment of final elastic modulus
23 Table 4 – Typical stress-strain data of stranded conductors based on published test results
24 8 Conductor creep
8.1 General
Table 5 – Final modulus of elasticity calculated with Ea= 55 000 MPa and Es= 190 000 MPa
Table 6 – Final modulus of elasticity calculated with Ea= 55 000 MPa and Es= 159 000 MPa (20SA)
25 8.2 Creep of single wires
Figures
Figure 1 – Typical creep curve
26 8.3 Total conductor creep
8.4 Prediction of conductor creep
8.5 Creep values
27 9 Loss of strength
Table 7 – Indicative creep values of stranded conductors(25 % RTS, 20 ℃)
28 Figure 2 – Loss of strength of aluminium A1 as a function of temperature
Figure 3 – Loss of strength of aluminium A2
29 Annex A (informative)A practical example of CCC calculation
A.1 Basic Assumptions
A.2 CCC calculation
31 Annex B (informative)Indicative conditions for CCC calculation
Table B.1 – Indicative conditions for CCC calculation
32 Bibliography

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BSI PD IEC TR 61597:2021
$167.15