PREN 50526-1 : DRAFT 2009

Introduction
1 Scope
2 Normative references
3 Terms and definitions
  3.1 System voltages
  3.2 Terms and definitions of an arrester
  3.3 General terms
4 Metal-oxide gapless surge arresters
  4.1 Marking
  4.2 Service requirements
  4.3 Requirements
5 Arrester classification
6 Type test
  6.1 General
  6.2 Insulation withstand tests on the arrester
       housing
  6.3 Residual voltage tests
  6.4 Charge transfer test
  6.5 Operating duty tests
  6.6 Short-circuit tests
  6.7 Internal partial discharge tests
  6.8 Bending moment test
  6.9 Seal leak rate test
  6.10 Environmental tests
7 Routine tests and acceptance tests
  7.1 Routine tests
  7.2 Acceptance tests
Annex A (normative) - Flowchart of testing procedure
        of bending moment
Annex B (informative) - Application guide
  B.1 General
  B.2 Service conditions
  B.3 Nominal discharge current (I[n])
  B.4 Continuous operating voltage d.c. (U[c])
  B.5 Protection level (U[p]) and charge transfer capability
  B.6 Procedure to select a surge arrester
Annex C (normative) - Direct lightning current impulse
        withstand test
Bibliography

Specifies non-linear metal-oxide resistor type surge arresters without spark gaps 102 designed to limit voltage surges on d.c. systems with nominal voltage up to 3 kV.