IEC 61897-2020 pdf download.Overhead lines – Requirements and tests for Aeolian vibration dampers (IEC 61897:2020).
This document applies to aeolian vibration dampers intended for single conductors or earth wires or conductor bundles where dampers are directly attached to each subconductor.
The purchaser may adopt part(s) of this document when specifying requirements for cables different from those mentioned above (e.g. optical ground wires (OPGW), all dielectric selfsupporting optical cables (ADSS)).
In some cases, test procedures and test values are left to agreement between the purchaser and the supplier and are stated in the procurement contract.
Annex A lists the minimum technical details to be agreed between purchaser and supplier.
Throughout this document, the word “conductor” is used when the test applies to dampers for conductors or earth wires.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60050(466):1 990, International Electrotechnical Vocabulary (IEV) – Chapter 466: Overhead lines
IEC 60888:1 987, Zinc-coated steel wires for stranded conductors
IEC 61 284:1 997, Overhead lines – Requirements and tests for fittings
IEC 61 854, Overhead lines – Requirements and tests for spacers
IEC 62567:201 3, Overhead lines – Methods for testing self-damping characteristics of conductors
ISO 1 461 :2009, Hot dip galvanized coatings on fabricated iron and steel articles – Specifications and test methods
ISO 2859-1 :1 999/AMD1 :201 1 , Sampling procedures for inspection by attributes – Part 1: Sampling schemes indexed by acceptable quality limit (AQL) for lot-by-lot inspection
ISO 2859-2:1 985, Sampling procedures for inspection by attributes – Part 2: Sampling plans indexed by limiting quality level (LQ) for isolated lot inspection
ISO 3951 -1 :201 3, Sampling procedures for inspection by variables – Part 1: Specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection for a single quality characteristic and a single AQL
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-466 apply, as well as the following.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 stockbridge-type aeolian vibration damper
device comprising a steel cable with a weight at each end and one bolted clamp or a helical rod attachment,attachable to a conductor, for the purpose of damping aeolian vibration
3.2 spiral aeolian vibration damper
SVD device made of helical plastic which wraps around the conductor for purposes of damping aeolian vibration (these are commonly used on earth wires, OPGW and ADSS cables)
3.3 elastomeric aeolian vibration damper
device comprising suspended weights connected to elastomeric articulations and one bolted clamp or a helical rod attachment, attachable to a conductor for the purpose of damping aeolian vibration
3.4 high temperature conductors
HTC conductors which are designed to have a maximum continuous operating temperature over 95 °C
3.5 maximum continuous operating temperature
conductor temperature specified by the manufacturer and measured at the outer wire layers
4 General requirements
4.1 Design
The damper shall be designed so as to
– damp aeolian vibration;
– withstand mechanical loads imposed during installation, maintenance and specified service conditions;
– avoid damage to the conductor under specified service conditions;
– be capable of being removed and re-installed without damage to the conductor.IEC 61897 pdf download.