IEC_TR_60865-2-2015.pdf

IEC TR 60865-2 Edition 2.0 2015-04 TECHNICA L REPOR T Short-circuit currents Calculation of effects Part 2:Examples of calculation IEC TR 60865-2:2015-04(en)THIS PUBLICA TION IS COPYRIGHT PROTECTED Copyright 2015 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no par t of this publication may be reproduced or utilized in any for m or by any means,electronic or mechanical,including photocopying and microfilm,without per mission in writing fr om either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional r ights to this publication,please contact the address below or your local IEC member National Committee for further infor mation.IEC Centr al Office Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About t he IEC The International Electr otechnical Commission(IEC)is the leading global organization that prepar es and publishes Inter national Standards for all electr ical,electronic and related technologies.A bout IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sur e that you have the latest edition,a cor rigenda or an amendment might have been published.IEC Cat alogue-webstore.iec.ch/cat alogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards,Technical Specifications,Technical R eports and other documents.A v ailable for PC,Mac OS,A ndroid Tablets and iPad.IEC publications search-w w w.iec.ch/searchpub The adv anced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projec ts,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.A v ailable online and also once a month by email.Elect ropedia-w w w.elect ropedia.org The worlds leading online dic tionary of elec tronic and electrical terms containing more than 30 000 terms and definitions in English and French,with equiv alent terms in 15 additional languages.Also known as the International Elec trotechnical Vocabulary (IEV)online.IEC Glossar y-st d.iec.ch/glossary More than 60 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries hav e been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC Customer Service Cent re-webstore.iec.ch/csc If y ou wish to giv e us y our feedback on this publication or need further assistance,please contact the Customer Serv ice Centre:csciec.ch.IEC TR 60865-2 Edit ion 2.0 2015-04 TECHNICA L R EPOR T Short-circuit currents Calculation of effects Part 2:Examples of calculation INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 17.220.01;29.240.20 ISBN 978-2-8322-2551-6 Warning!Make sure that you obtained this publication from an authorized distributor.2 IEC TR 60865-2:2015 IEC 2015 CONTENTS FOREWORD.5 1 Scope.7 2 Normative references.7 3 Symbols and units.7 4 Example 1 Mechanical effects on a 10 kV arrangement with single rigid conductors.8 4.1 General.8 4.2 Data.9 4.3 Normal load case:Conductor stress and forces on the supports caused by dead load.9 4.4 Exceptional load case:Effects of short-circuit currents.10 4.4.1 Maximum force on the central main conductor.10 4.4.2 Conductor stress and forces on the supports.11 4.5 Conclusions.13 5 Example 2 Mechanical effects on a 10 kV arrangement with multiple rigid conductors.14 5.1 General.14 5.2 Data(additional to the data of Example 1).14 5.3 Normal load case:Conductor stress and forces on the supports caused by dead load.15 5.4 Exceptional load case:Effects of short-circuit currents.15 5.4.1 Maximum forces on the conductors.15 5.4.2 Conductor stress and forces on the supports.16 5.5 Conclusions.20 6 Example 3.Mechanical effects on a high-voltage arrangement with rigid conductors.20 6.1 General.20 6.2 Data.21 6.3 Normal load case:Conductor stress and forces on the supports caused by dead load.22 6.4 Exceptional load case:Effects of short-circuit currents.23 6.4.1 Maximum force on the central main conductor.23 6.4.2 Conductor stress and forces on the supports.23 6.4.3 Conclusions.29 7 Example 4.Mechanical effects on a 110 kV arrangement with slack conductors.30 7.1 General.30 7.2 Data.31 7.3 Electromagnetic load and characteristic parameters.32 7.4 Tensile force Ft,d during short-circuit caused by swing out.34 7.5 Dynamic conductor sag at midspan.35 7.6 Tensile force Ff,d after short-circuit caused by drop.36 7.7 Horizontal span displacement bh and minimum air clearance amin.36 7.8 Conclusions.36 8 Example 5.Mechanical effects on strained conductors.37 8.1 General.37 8.2 Common data.37 8.3 Centre-line distance between sub-conductors as=0,1 m.38