IEC 61854:1998 pdf download – overhead lines – Requirements and tests for spacers

IEC 61854:1998 pdf download – overhead lines – Requirements and tests for spacers.
It does not apply to interphase spacers, hoop spacers and bonding spacers.
NOTE — ThIs standard a written to cover the line desn practices and spacers most commonly u5ed at me time ot writing. There may be other spacers avaiLabt for wti’ch tiw ap.cbc tests reported in this standard may fbi be appIic.aie
In many cases, test procedures and test values are left to agreement between purchaser and supplier and are stated in the procurement contract. The purchaser is best able to evaluate the intended service conditions, which should be the basis for establishing the test severity.
In annex A. the minimum technical details to be agreed between purchaser and suppher are listed.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of thts International Standard. At the time of publication of this standard, 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 01 currently valid International Standards.
IEC 60050(466):1 990, International Elecirotechnical vocabulary (1EV) — Chapter 466: Overhead Ines
lEG 61284:1997, Overhead lines — Reqwrernents and tests for fittings IEC 60888:1987, Zinc-coated steel wires for stranded conductors
ISO 34-1:1994, Rubber, vulcanized or thermoplastic — Determination of tear strength — Part 1:
Trouser, angle and crescent test pieces
ISO 34-2:1996, Rubber, vulcanized or thermoplastic — Determination of tear strength — Par: 2:
Small (Deilt) test pieces
ISO 37:1994. Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
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 ate given belOw.
3.1
rigid spacer
spacer allowing no relative movement between the subconductors at the spacer location
3.2
flexible spacer
spacer allowing relative movements between the subconductors at the spacer location
3-3
spacer system
complex of spacers and the relevant in.span distribution
4 General requirements
4.1 Design
The spacer shall be designed as to
— maintain subconductor spacing (at spacer locations), within any prescribed limits, under all conditions of service excluding short-circuit currents:
— prevent. in subspans between spacers, physical contact between subconductors. eacept during the passage of short circuit currents when the possibility of contact is accepted provided that the specified spacing is restored immediately following fault clearance;
– withstand mechanical loads imposed on the spacer during Installation, maintenance and service (including short circuit conditions) without any component failure or unacceptable permanent deformation:
— avoid damage to the subconductor under specified service conditions;
— be free from unacceptable levels of corona and radio interference under specified service conditions:
— be suitable for safe and easy Installation. For the bolted and latching clamp the design shall retain all parts when opened for attachment to the conductor;
— ensure that lndivdual components will not become loose in service;
— be capable of being removed and re-installed on the subconductors without damage to the spacer or subconductors:
— maintain its function over the entire service temperature range;
— avoid audible noise,
NOTE — Other desirable characteristics, which are not essentisi to the basic functions of the spacer but which may
be advantageous to the purchaser. Inciude
– verihication of proper instaliation from the ground,
— ease ol insialialion and removal from energized lines
4.3 Mass, dimensions and tolerances
Spacer mass and significant dimensions, including appropriate tolerances, shall be shown on contract drawings.
NOTE — Toteances applied to the ness and to the dimensions Should ensure that the spacers meet their specitied mechanical and escirical r.quIr.m.nls
4.4 Protection against corrosion
In addition 10 the applicable requirements of IEC 61284, stranded steel wires, ii used, shall be protected against corrosion in accordance with IEC 60888.
4.5 Manufacturing appearance and finish
The spacers shall be tree of defects and irregularities: all outside surfaces shall be smooth and all ed9es and corners well-rounded.
4.6 Marking
The filling marking requirements of IEC 61284 shall be applied to all clamp assemblies including those using breakaway bolts.
Correct position of the top of the spacer (for example arrows pointing upward), it necessary. shall also be provided.