NBN EN 61897 : 1999

1 Scope
2 Normative references
3 Definitions
4 General requirements
    4.1 Design
    4.2 Materials
    4.3 Mass, dimensions and tolerances
    4.4 Protection against corrosion
    4.5 Manufacturing appearance and finish
    4.6 Marking
    4.7 Installation instructions
5 Quality assurance
6 Classification of tests
    6.1 Type tests
          6.1.1 General
          6.1.2 Application
    6.2 Sample tests
          6.2.1 General
          6.2.2 Application
          6.2.3 Sampling, acceptance criteria
    6.3 Routine tests
          6.3.1 General
          6.3.2 Application and acceptance criteria
    6.4 Table of tests to be applied
7 Test methods
    7.1 Visual examination
    7.2 Verification of dimensions, materials and mass
    7.3 Corrosion protection tests
          7.3.1 Hot dip galvanized components (other than
                  messenger cable wires)
          7.3.2 Ferrous components protected from corrosion
                  by methods other than hot dip galvanizing
          7.3.3 Hot dip galvanized messenger cable wires
    7.4 Non-destructive tests
    7.5 Clamp slip test
    7.6 Breakaway bolt test
    7.7 Clamp bolt tightening test
    7.8 Attachment of weights to messenger cable
    7.9 Attachment of clamp to messenger cable test
    7.10 Corona and radio interference voltage (RIV) tests
    7.11 Damper performance tests
          7.11.1 Performance test variants
          7.11.2 Damper characteristic test
          7.11.3 Damper effectiveness evaluation
                  7.11.3.1 Methods of evaluation
                  7.11.3.2 Laboratory test
                  7.11.3.3 Field test
                  7.11.3.4 Analytical method
    7.12 Damper fatigue test
          7.12.1 Test methods
          7.12.2 Swept frequency method
          7.12.3 Resonant frequency method
          7.12.4 Acceptance criteria
Annex A (normative) Minimum technical details to be agreed
between purchaser and supplier
Annex B (informative) Examples of graphs relevant to damper
characteristic test
Annex C (normative) Wind power input curve
Annex ZA Normative references to international publications
with their corresponding European publications
Bibliography

Applicable to Stockbridge type aeolian vibration dampers meant for single conductors or earth wires or conductor bundles where dampers are directly attached to each subconductor.