IEC 61897:1998 pdf download – overhead lines – Requirements and tests for Stockbridge type aeolian vibration dampers

IEC 61897:1998 pdf download – overhead lines – Requirements and tests for Stockbridge type aeolian vibration dampers.
IEC 61897 applies to Stockbridge type 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 standard when specifying requirements for other types of aeolian vibration dampers or for Stockbridge dampers used on conductors or cables different from those mentioned above (e.g. optical ground wires, all dielectric self-supporting optical cables).
In many 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 standard, the word conductor is used when the test applies to Stockbridge
dampers for conductors or earth wires.
2 Normative references
The following normative documents contain provisions which, through reference In this text. constitute provisions of this International Standard, At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 604)5O(468):1990, International Electrolechnical Vocabulary (1EV) – Chapter 466:
Overhead lines
IEC 61284:1997, Overhead lines — Requirements and tests for fittings
IEC 60888:1987, Zinc-coated steel wires for stranded conductors
ISO 1461. Hot dip gatvanized coatings on fabricated ferrous products — Specifications ‘I
ISO 2859-1 1989, Sampling procedures for inspection by attributes — Part f: Sampling plans indexed by acceptable quality level (AOL) for lot -by-lot inspection
ISO 2859-2:1985, Sarnplh’ig procedures for inspection by attributes — Part 2: Sampling plans indexed by limiting quality level (LO) for isolated lot inspection
ISO 3951:1989, Sampling procedures and charts for inspection by variables fo* percent nonconforming
3 Definitions
For the purpose of this International Standard, the definitions of the International Electrotechnical Vocabulary (1EV) apply, in particular IEC 60050(466). Those which differ or do not appear in the 1EV are given below
Stockbridge-type aeolian vibration damper
device comprising a messenger cable with a weight at each end and one bolted clamp. attachable to a conductor for the purpose of damping aeolian vibration
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 specitied service conditions:
— be capable of being removed and re-Installed without damage to the conductor:
— be free from unacceptable levels of corona and radio interference under all service conditions:
— be suitable for safe and easy installation. The clamp design shall retain all parts when opened for attachment to conductor. Furthermore, the clamp design shall be such that the damper, during installation, can be suspended on the conductor before tightening the clamp:
— ensure that individual components will not become loose in service; maintain its function over Ihe entire service temperature range:
— avoid audible noise:
— prevent water collection,
NOTE — OTher desirable ciaractanstics wtiich are riot essential to the basic functions of the damper but which may be advantageous include:
– v.rification of proper installation from th. ground:
— ease 04 installation and removal from energized iinea
In th case of vibraben dampers br conductors or •arth ,r.s containing integral fibr, optic elements (or an entemally apied optical cable wrapped around the eaflh w.re account should be made ol me po,B.ble effects 01 the damper on theie fibre optic elements.
4.2 Materiats
The materials shall conform to the requirements of lEG 61284.
4.3 Mass, dimensions end tolerances
Damper mass and significant dimensions. including appropriate tolerances, shall be shown on contract drawings.