IEC TS 60071-5:2002

FOREWORD
1 General
   1.1 Scope
   1.2 Additional background
2 Normative references
3 Definitions
4 Symbols and abbreviations
   4.1 Subscripts
   4.2 Letter symbols
   4.3 Abbreviations
   4.4 Typical HVDC converter station schemes and
        associated graphical symbols
5 Principles of insulation co-ordination
   5.1 Essential differences between a.c. and d.c.
        systems
   5.2 Insulation co-ordination procedure
6 Voltages and overvoltages in service
   6.1 Arrangements of arresters
   6.2 Continuous operating voltages at various locations
        in the converter station
   6.3 Peak (PCOV) and crest value (CCOV) of continuous
        operating voltage applied to valves and arresters
   6.4 Sources and types of overvoltages
   6.5 Overvoltage limiting characteristics of arresters
   6.6 Valve protection strategy
   6.7 Methods and tools for overvoltage and surge arrester
        characteristic studies
   6.8 Necessary system details
7 Design objectives of insulation co-ordination
   7.1 Arrester requirements
   7.2 Characteristics of insulation
   7.3 Representative overvoltages
   7.4 Determination of the required withstand voltage
   7.5 Determination of the specified withstand voltage
   7.6 Creepage distances
   7.7 Clearances in air
8 Creepage distances and clearances in air
   8.1 Creepage distance for outdoor insulation under d.c.
        voltage
   8.2 Creepage distance for indoor insulation under d.c.
        voltage
   8.3 Creepage distance of a.c. insulators (external)
   8.4 Clearances in air
9 Arrester requirements
   9.1 Arrester specification
   9.2 AC bus arrester (A)
   9.3 AC filter arrester (FA)
   9.4 Valve arrester (V)
   9.5 Bridge arrester (B)
   9.6 Converter unit arrester (C)
   9.7 Mid-point d.c. bus arrester (M)
   9.8 Converter unit d.c. bus arrester (CB)
   9.9 DC bus and d.c. line/cable arrester (DB and DL)
   9.10 Neutral bus arrester (E)
   9.11 DC reactor arrester (DR)
   9.12 DC filter arrester (FD)
   9.13 Earth electrode station arrester
Annex A (informative) Example of insulation co-ordination
        for conventional HVDC converters
Annex B (informative) Example of insulation co-ordination
        for Controlled Series Capacitor Converters (CSCC)
        and Capacitor Commutated Converters (CCC)
Annex C (informative) Considerations for insulation
        co-ordination of some special converter configurations
Bibliography
Figures
Tables

Provides guidance on the procedures for insulation co-ordination of high-voltage direct current (HVDC) converter stations, without prescribing standardized insulation levels. Applies only for HVDC applications in high-voltage a.c. power systems and not for industrial conversion equipment. Principles and guidance given are for insulation co-ordination purposes only. The requirements for human safety are not covered.