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IEC TR 60071-4 : 1.0

IEC TR 60071-4 : 1.0

INSULATION CO-ORDINATION - PART 4: COMPUTATIONAL GUIDE TO INSULATION CO-ORDINATION AND MODELLING OF ELECTRIC NETWORKS

International Electrotechnical Committee

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Table of Contents

FOREWORD<br>1 Scope and object<br>2 Normative references<br>3 Terms and definitions<br>4 List of symbols and acronyms<br>5 Types of overvoltages<br>6 Types of studies<br>&nbsp;&nbsp;&nbsp;6.1 Temporary overvoltages (TOV)<br>&nbsp;&nbsp;&nbsp;6.2 Slow-front overvoltages (SFO)<br>&nbsp;&nbsp;&nbsp;6.3 Fast-front overvoltages (FFO) <br>&nbsp;&nbsp;&nbsp;6.4 Very-fast-front overvoltages (VFFO)<br>7 Representation of network components and numerical <br>&nbsp;&nbsp;&nbsp;considerations <br>&nbsp;&nbsp;&nbsp;7.1 General <br>&nbsp;&nbsp;&nbsp;7.2 Numerical considerations<br>&nbsp;&nbsp;&nbsp;7.3 Representation of overhead lines and underground cables<br>&nbsp;&nbsp;&nbsp;7.4 Representation of network components when computing <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;temporary overvoltages <br>&nbsp;&nbsp;&nbsp;7.5 Representation of network components when computing <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;slow-front overvoltages <br>&nbsp;&nbsp;&nbsp;7.6 Representation of network components when computing <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fast-front transients<br>&nbsp;&nbsp;&nbsp;7.7 Representation of network components when computing <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;very-fast-front overvoltages<br>8 Temporary overvoltages analysis<br>&nbsp;&nbsp;&nbsp;8.1 General <br>&nbsp;&nbsp;&nbsp;8.2 Fast estimate of temporary overvoltages <br>&nbsp;&nbsp;&nbsp;8.3 Detailed calculation of temporary overvoltages [2], [9] <br>9 Slow-front overvoltages analysis <br>&nbsp;&nbsp;&nbsp;9.1 General<br>&nbsp;&nbsp;&nbsp;9.2 Fast methodology to conduct SFO studies <br>&nbsp;&nbsp;&nbsp;9.3 Method to be employed<br>&nbsp;&nbsp;&nbsp;9.4 Guideline to conduct detailed statistical methods <br>10 Fast-front overvoltages analysis <br>&nbsp;&nbsp;&nbsp;10.1 General <br>&nbsp;&nbsp;&nbsp;10.2 Guideline to apply statistical and semi-statistical <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;methods <br>11 Very-fast-front overvoltage analysis <br>&nbsp;&nbsp;&nbsp;11.1 General <br>&nbsp;&nbsp;&nbsp;11.2 Goal of the studies to be performed <br>&nbsp;&nbsp;&nbsp;11.3 Origin and typology of VFFO <br>&nbsp;&nbsp;&nbsp;11.4 Guideline to perform studies <br>12 Test cases<br>&nbsp;&nbsp;&nbsp;12.1 General <br>&nbsp;&nbsp;&nbsp;12.2 Case 1: TOV on a large transmission system including <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;long lines <br>&nbsp;&nbsp;&nbsp;12.3 Case 2 (SFO) - Energization of a 500 kV line <br>&nbsp;&nbsp;&nbsp;12.4 Case 3 (FFO) - Lightning protection of a 500 kV GIS <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;substation <br>&nbsp;&nbsp;&nbsp;12.5 Case 4 (VFFO) - Simulation of transients in a 765 kV <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GIS [51]<br>Annex A (informative) Representation of overhead lines and <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;underground cables<br>Annex B (informative) Arc modelling: the physics of the circuit-<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;breaker <br>Annex C (informative) Probabilistic methods for computing <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lightning-related risk of failure of <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;power system apparatus <br>Annex D (informative) Test case 5 (TOV) - Resonance between a <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;line and a reactor in a 400/220 kV <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;transmission system<br>Annex E (informative) Test case 6 (SFO) - Evaluation of the risk <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;of failure of a gas-insulated line due to SFO<br>Annex F (informative) Test case 7 (FFO) - High-frequency arc <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;extinction when switching a reactor <br>Bibliography<br>Figures<br>Tables

Abstract

Provides guidance on conducting insulation co-ordination studies which purpose internationally recognized recommendations for the numerical modelling of electrical systems, and for the implementation of deterministic and probabilistic methods adapted to the use of numerical programmes.

General Product Information

Document Type Standard
Status Current
Publisher International Electrotechnical Committee
Committee TC 28

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