1、 IEC 60865-1 Edition 3.0 2011-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Short-circuit currents Calculation of effects Part 1: Definitions and calculation methods Courants de court-circuit Calcul des effects Partie 1: Dfinitions et mthodes de calcul IEC60865-1:2011 THIS PUBLICATION IS COPYRIGHT
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16、csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60865-1 Edition 3.0 2011-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Short-circuit currents Calculation of effects Part 1: Definitions and calculation methods Courants de court-circuit Calcul des effects Partie 1: Dfinitions et mthodes de
17、calcul INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XA ICS 17.220.01; 29.240.20 PRICE CODE CODE PRIX ISBN 978-2-88912-771-9 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60
18、865-1 IEC:2011 CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3 Terms, definitions, symbols and units . 7 3.1 Terms and definitions 7 3.2 Symbols and units . 9 4 General 12 5 Rigid conductor arrangements 13 5.1 General . 13 5.2 Calculation of electromagnetic forces 13 5.2.1 Calculation
19、 of peak force between the main conductors during a three-phase short-circuit 13 5.2.2 Calculation of peak force between the main conductors during a line-to-line short-circuit . 13 5.2.3 Calculation of peak value of force between coplanar sub-conductors . 14 5.3 Effective distance between main cond
20、uctors and between sub-conductors 14 5.4 Calculation of stresses in rigid conductors . 16 5.4.1 Calculation of stresses 16 5.4.2 Section modulus and factor q of main conductor composed of sub-conductors . 17 5.4.3 Permitted conductor stress 20 5.5 Structure loads due to rigid conductors . 21 5.6 Con
21、sideration of automatic reclosing . 21 5.7 Calculation with special regard to conductor oscillation . 22 5.7.1 General . 22 5.7.2 Determination of relevant natural frequency . 23 5.7.3 The factors VF, Vm, Vs, Vrmand Vrs. 23 6 Flexible conductor arrangements 26 6.1 General . 26 6.2 Effects on horizon
22、tal main conductors . 27 6.2.1 General . 27 6.2.2 Characteristic dimensions and parameter 27 6.2.3 Tensile force Ft,dduring short-circuit caused by swing out (short-circuit tensile force) without dropper in midspan 30 6.2.4 Dynamic change of sag due to elongation of conductor and change of shape of
23、the conductor curve . 31 6.2.5 Tensile force Ft,dduring short-circuit caused by swing out (short-circuit tensile force) with dropper in the middle of the span 32 6.2.6 Tensile force Ff,dafter short-circuit caused by drop (drop force) 33 6.2.7 Horizontal span displacement bhand minimum air clearance
24、amin. 33 6.3 Effects on vertical main conductors (droppers) 34 6.4 Effects on bundled conductors 35 6.4.1 Characteristic dimensions and parameter 35 6.4.2 Tensile force Fpi,din the case of clashing sub-conductors . 38 6.4.3 Tensile force Fpi,d in the case of non-clashing sub-conductors 38 6.5 Struct
25、ure loads due to flexible conductors . 41 6.5.1 Design load for post insulators, their supports and connectors 41 60865-1 IEC:2011 3 6.5.2 Design load for structures, insulators and connectors with tensile forces transmitted by insulator chains 41 6.5.3 Design load for foundations . 42 7 The thermal
26、 effect on bare conductors 42 7.1 General . 42 7.2 Calculation of thermal equivalent short-circuit current . 42 7.3 Calculation of temperature rise and rated short-time withstand current density for conductors . 43 7.4 Calculation of thermal short-time strength for different durations of the short-c
27、ircuit 44 Annex A (normative) Equations for calculation of diagrams 46 Bibliography 51 Figure 1 Factor k1s for calculating the effective conductor distance 15 Figure 2 Loading direction and bending axis for multiple conductor arrangements 18 Figure 3 Factor e for the influence of connecting pieces i
28、n Equation (17) . 24 Figure 4 Factors VF, Vm and Vsto be used with the three-phase and line-to-line short-circuits . 25 Figure 5 Factors Vrm and Vrsto be used with three-phase automatic reclosing . 26 Figure 6 Maximum swing out angle max for a given maximum short-circuit duration Tk130 Figure 7 Fact
29、or for tensile force in flexible conductors 31 Figure 8 Geometry of a dropper . 33 Figure 9 2as a function of 137 Figure 10 3sin n180as a function of as/d . 37 Figure 11 as a function of j and st38 Figure 12 as a function of j and st41 Figure 13 Relation between rated short-circuit withstand current
30、 density (Tkr = 1 s) and conductor temperature . 44 Table 1 Effective distance asbetween sub-conductors for rectangular cross-section dimensions . 16 Table 2 Maximum possible values of VmVrm, VsVrs, VFVrm19 Table 3 Factors , , for different busbar support arrangements 20 Table 4 Factor q . 22 Table
31、5 Section moduli Wmof main conductors with two or more stiffening elements between two adjacent supports. The stiffening elements are black. 22 Table 6 Recommended highest temperatures for mechanically stressed conductors during a short-circuit . 43 4 60865-1 IEC:2011 INTERNATIONAL ELECTROTECHNICAL
32、COMMISSION _ SHORT-CIRCUIT CURRENTS CALCULATION OF EFFECTS Part 1: Definitions and calculation methods FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The ob
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43、C 60865-1 has been prepared by IEC technical committee 73: Short-circuit currents. This third edition cancels and replaces the second edition published in 1993. This edition constitutes a technical revision. The main changes with respect to the previous edition are listed below: The determinations f
44、or automatic reclosure together with rigid conductors have been revised. The influence of mid-span droppers to the span has been included. For vertical cable-connection the displacement and the tensile force onto the lower fixing point may now be calculated. Additional recommendations for foundation
45、 loads due to tensile forces have been added. 60865-1 IEC:2011 5 The subclause for determination of the thermal equivalent short-circuits current has been deleted (it is now part of IEC 60909-0). The regulations for thermal effects of electrical equipment have been deleted. The standard has been reo
46、rganized and some of the symbols have been changed to follow the conceptual characteristic of international standards. The text of this standard is based on the following documents: CDV Report on voting 73/152/CDV 73/153/RVC Full information on the voting for the approval of this standard can be fou
47、nd in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 60865 series, under the general title, Short-circuit currents Calculation of effects can be found on the IEC website. The commi
48、ttee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised editi
49、on, or amended. 6 60865-1 IEC:2011 SHORT-CIRCUIT CURRENTS CALCULATION OF EFFECTS Part 1: Definitions and calculation methods 1 Scope This part of IEC 60865 is applicable to the mechanical and thermal effects of short-circuit currents. It contains procedures for the calculation of the electromagnetic effect on rigid conductors and flexible conductors,
