IEC 62420:2008 pdfダウンロード

IEC 62420:2008 pdfダウンロードConcentric lay stranded overhead electrical conductors containing one or more gap(s)
1 Scope
This International Standard specifies the electrical and mechanical characteristics of concentric lay stranded overhead electrical conductors, containing one or more selfsupporting aluminium or aluminium alloy layer(s) as depicted in Figure 1 , made of combinations of any of the following metal wires:
a) hard-drawn aluminium as per IEC 60889, designated A1 ;
b) aluminium alloy type A or B as per IEC 601 04, designated A2 or A3;
c) thermal resistant aluminium alloy type as per IEC 62004, designated AT1 , AT2, AT3 or AT4;
d) regular strength steel as per IEC 60888, designated S1 A or S1 B;
e) high strength steel as per IEC 60888, designated S2A or S2B;
f) extra-high strength steel as per IEC 60888, designated S3A;
g) aluminium-clad steel as per IEC 61 232, designated 20SA, 27SA, 30SA or 40SA.
NOTE This standard covers the construction of self-damping conductors, as well as gap-type conductors.
Although both types of conductors share a common design feature and the presence of one or more gaps between layers, they are intended for different purposes. Self-damping conductors (SDC) may have more than one gap to provide increased self-damping, whereas gap-type conductors are so designed as to allow the aluminium layers to slide freely over the core during installation, and therefore usually do not require more than one gap.
The various metal combinations permitted by this standard shall be in accordance with Table 1 .
2 Normative references
The following referenced documents are indispensable for the application 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 601 04:1 987, Aluminium-magnesium-silicon alloy wire for overhead line conductors
IEC 60888:1 987, Zinc-coated steel wires for stranded conductors
IEC 60889:1 987, Hard-drawn aluminium wire for overhead line conductors
IEC 61 232:1 993, Aluminium-clad steel wires for electrical purposes
IEC 61 395:1 998, Creep test procedures for stranded conductors
IEC 62004:2007, Thermal resistant aluminium alloy wire for overhead line conductors
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
aluminium
all types of aluminium and aluminium alloys listed in Clause 1
3.2
annular gap
constant space, void of any material except for air or grease, between two layers of a conductor
3.3
canting
phenomena by which a formed wire is twisted relative to its own axis, thus producing a protuberance outside the layer
3.4
conductor
material intended to be used for carrying electric current consisting of a plurality of uninsulated wires twisted together
3.5
concentric lay stranded conductor
conductor composed of a central core surrounded by one or more adjacent layers of wires being laid helically in opposite directions