IEC_60071-4_Insulation_Co-Ordination.pdf

PUBLISHED DOCUMENTPD IEC TR 60071-4:2004Insulation co-ordination Part 4:Computational guide to insulation co-ordination and modelling of electrical networksICS 29.080.30?Copyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Qatar Petroleum/5943408001,12/08/200421:49:44 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-PD IEC TR 60071-4:2004This Published Document was published under the authority of the Standards Policy and Strategy Committee on 17 August 2004 BSI 17 August 2004ISBN 0 580 44284 5National forewordThis Published Document reproduces verbatim IEC TR 60071-4:2004.The UK participation in its preparation was entrusted to Technical Committee GEL/28,Insulation coordination,which has the responsibility to:A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled“International Standards Correspondence Index”,or by using the“Search”facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract.Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.aid enquirers to understand the text;present to the responsible international/European committee any enquiries on the interpretation,or proposals for change,and keep the UK interests informed;monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover,an inside front cover,the IEC TR title page,pages 2 to 118,an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd.No.DateCommentsCopyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Qatar Petroleum/5943408001,12/08/200421:49:44 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-TECHNICAL REPORT IEC TR 60071-4 First edition2004-06 Insulation co-ordination Part 4:Computational guide to insulation co-ordination and modelling of electrical networks Reference number IEC/TR 60071-4:2004(E)Copyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Qatar Petroleum/5943408001,12/08/200421:49:44 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-CONTENTS FOREWORD.7 1 Scope and object.9 2 Normative references.9 3 Terms and definitions.9 4 List of symbols and acronyms.12 5 Types of overvoltages.12 6 Types of studies.13 6.1 Temporary overvoltages(TOV).14 6.2 Slow-front overvoltages(SFO).14 6.3 Fast-front overvoltages(FFO).15 6.4 Very-fast-front overvoltages(VFFO).15 7 Representation of network components and numerical considerations.15 7.1 General.15 7.2 Numerical considerations.15 7.3 Representation of overhead lines and underground cables.18 7.4 Representation of network components when computing temporary overvoltages.19 7.5 Representation of network components when computing slow-front overvoltages.25 7.6 Representation of network components when computing fast-front transients.30 7.7 Representation of network components when computing very-fast-front overvoltages.42 8 Temporary overvoltages analysis.44 8.1 General.44 8.2 Fast estimate of temporary overvoltages.45 8.3 Detailed calculation of temporary overvoltages 2,9.45 9 Slow-front overvoltages analysis.48 9.1 General.48 9.2 Fast methodology to conduct SFO studies.48 9.3 Method to be employed.49 9.4 Guideline to conduct detailed statistical methods.49 10 Fast-front overvoltages analysis.52 10.1 General.52 10.2 Guideline to apply statistical and semi-statistical methods.53 11 Very-fast-front overvoltage analysis.58 11.1 General.58 11.2 Goal of the studies to be performed.58 11.3 Origin and typology of VFFO.58 11.4 Guideline to perform studies.60 12 Test cases.60 12.1 General.60 12.2 Case 1:TOV on a large transmission system including long lines.60 12.3 Case 2(SFO)Energization of a 500 kV line.68 12.4 Case 3(FFO)Lightning protection of a 500 kV GIS substation.73 12.5 Case 4(VFFO)Simulation of transients in a 765 kV GIS 51.80 PD IEC TR 600714:20042Copyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Qatar Petroleum/5943408001,12/08/200421:49:44 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-Annex A(informative)Representation of overhead lines and underground cab