1、 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)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2021 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publ
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9、line.IEC TR 61597 Edition 2.0 2021-06 TECHNICAL REPORT Overhead electrical conductors Calculation methods for stranded bare conductors INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.240.20 ISBN 978-2-8322-9938-8 Registered trademark of the International Electrotechnical Commission Warning!Make sur
10、e that you obtained this publication from an authorized distributor.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
11、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.9 5.7 Convection heat loss.10 5.8 Method to calculate current carrying capacity(CCC).10 5.9 Determination of the maximum permissible aluminium temperature.10 5.10 Calculated
12、 values of current carrying capacity.11 6 Alternating current resistance,Inductive and capacitive reactances.11 6.1 General.11 6.2 Alternating current(AC)resistance.11 6.3 Inductive reactance.12 6.4 Capacitive reactance.14 7 Elongation of stranded conductors.14 7.1 General.14 7.2 Thermal elongation.
13、15 7.3 Stress-strain properties.18 7.4 Assessment of final elastic modulus.20 8 Conductor creep.22 8.1 General.22 8.2 Creep of single wires.23 8.3 Total conductor creep.24 8.4 Prediction of conductor creep.24 8.5 Creep values.24 9 Loss of strength.25 Annex A(informative)A practical example of CCC ca
14、lculation.27 A.1 Basic Assumptions.27 A.2 CCC calculation.27 Annex B(informative)Indicative conditions for CCC calculation.29 Bibliography.30 Figure 1 Typical creep curve.23 Figure 2 Loss of strength of aluminium A1 as a function of temperature.26 Figure 3 Loss of strength of aluminium A2.26 IEC TR
15、61597:2021 IEC 2021 3 Table 1 Values of Kg for inductive reactance calculations.13 Table 2 Coefficient of linear expansion of inhomogeneous conductors designated Ax/Sxy.17 Table 3 Coefficient of linear expansion of inhomogeneous conductors designated Ax/20SA.18 Table 4 Typical stress-strain data of
16、stranded conductors based on published test results.21 Table 5 Final modulus of elasticity calculated with Ea=55000 MPa and Es=190000 MPa.22 Table 6 Final modulus of elasticity calculated with Ea=55000 MPa and Es=159000 MPa(20SA).22 Table 7 Indicative creep values of stranded conductors(25%RTS,20).25 Table B.1 Indicative conditions for CCC calculation.29 4 IEC TR 61597:2021 IEC 2021 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OVERHEAD ELECTRICAL CONDUCTORS CALCULATION METHODS FOR STRANDED BARE C
