SN EN 60099-5 : 1996 AMD 1 1999

Foreword
Introduction
Section 1. General
1.1 Scope
1.2 Normative references
1.3 General principles for the application of surge
      arresters
1.4 General procedure for the selection of surge arresters
1.5 Polluted housing arrester withstand
Section 2. Non-linear resistor type gapped surge arresters
according to IEC 99-1
2.1 Characteristic data of gapped surge arresters
2.2 Selection of gapped arresters phase-to-earth
Section 3. Gapless metal-oxide surge arresters according
to IEC 99-4
3.1 Characteristic data of gapless metal-oxide surge
      arresters
3.2 Selection of gapless metal-oxide surge arresters
      phase-to-earth
Section 4. Application of arresters
4.1 Principle of insulation co-ordination
4.2 Protection from slow-front overvoltages
4.3 Protection from lightning overvoltages
Section 5. Surge arresters for special application
5.1 Surge arresters for transformer neutrals
5.2 Surge arresters between phases
5.3 Surge arresters for rotating machines
5.4 Further special applications of surge arresters
5.5 Surge arresters for abnormal service conditions
Section 6. Diagnostic indicators of metal-oxide surge
arresters in service
6.1 General
6.2 Discharge counters
6.3 Monitoring spark gaps
6.4 Device for monitoring the continuous current
6.5 Summary of diagnostic methods
Annex A (informative) Determination of temporary overvoltages due
        to earth faults
Annex B (informative) Current practice
Annex C (informative) Bibliography
Annex ZA (normative) Normative references to international
         publications with their corresponding European publications

Gives recommendations for selecting and applying surge arresters for use in three-phase systems having nominal voltages over 1 kV. Applicable to non-linear resistor type gapped surge arresters as specified in IEC 99-1, and to gapless metal-oxide surge arresters as in IEC 99-4.