IEC 62219-2002 pdf – Overhead electrical conductors – Formed wire, concentric lay, stranded conductors.
1 Scope This International Standard specifies the electrical and mechanical characteristics of concentric lay, overhead conductors of wires formed or shaped before, during or after stranding, made of combinations of any of the following metal wires: a) hard aluminium as per IEC 60889 designated A1; b) hard aluminium as per IEC 60889 designated A1F wire shaped before stranding; c) hard aluminium alloy as per IEC 60104 designated A2 or A3; d) hard aluminium alloy as per IEC 60104 designated A2F or A3F shaped before stranding; e) regular strength steel, designated S1A or S1B, where A and B are zinc coating classes, corresponding respectively to classes 1 and 2; f) high strength steel, designated S2A or S2B; g) extra high strength steel, designated S3A; h) aluminium clad steel, designated SA. The following are examples of some possible conductor designations. Other combinations are also permitted. • A1F, A2F, A3F • A1F/S1A, A1F/S1B, A1F/S2A, A1F/S2B, A1F/S3A • A1F/A1, A1F/A2, A1F/A3 • A1F/SA, A2F/SA, A3F/SA Other possible conductor types not included above are not specifically excluded. 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 60050(466):1990, International Electrotechnical Vocabulary – Chapter 466: Overhead lines IEC 60104:1987, Aluminium-magnesium-silicon alloy wire for overhead line conductors IEC 60888:1987, Zinc-coated steel wires for stranded conductors IEC 60889:1987, Hard-drawn aluminium wire for overhead line conductors IEC 61089:1991, Round wire concentric lay overhead electrical stranded conductors IEC 61232:1993, Aluminium-clad steel wires for electrical purposes IEC 61395:1998, Overhead electrical conductors – Creep test procedures for stranded conductors
3 Definitions For the purpose of this International Standard the following definitions apply: 3.1 aluminium all types of aluminium and aluminium alloys listed 3.2 conductor material intended to be used for carrying electric current consisting of a plurality of uninsulated wires twisted together [IEV 466-01-15 modified] 3.3 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 3.4 direction of lay 3.4.1 direction of lay (general definition) direction of twist of a layer of wires as it moves away from the viewer NOTE A right-hand lay is a clockwise direction and a left-hand lay is an anti-clockwise direction. [IEV 466-10-07 modified] 3.4.2 direction of lay (alternative definition) the direction of lay is defined as right-hand or left-hand NOTE With right-hand lay, the wires conform to the direction of the central part of the letter Z when the conductor is held vertically. With left-hand lay, the wires conform to the direction of the central part of the letter S when the conductor is held vertically. 3.5 equivalent wire diameter the diameter of a round wire which would have the same cross-sectional area, mass and electrical resistance as a given formed wire of the same material 3.6 compactness ratio area 1/area 2 – where area 1 is the total cross-sectional area of the conductor including the core and area 2 is the area of a circle with diameter equal to the conductor outside diameter 3.7 fill ratio area 1/(area 2 − area 3) – where area 1 is the cross-sectional area of the aluminium portion of the conductor, area 2 is the area of a circle of diameter equal to the conductor outside diameter and area 3 is the area of a circle circumscribing the core of a composite conductor (0 for a homogeneous conductor)
4 Designation system A designation system is used to identify stranded conductors made of formed aluminium, with or without steel wires. Homogeneous aluminium conductors are designated AxF, where x identifies the type of aluminium. Composite aluminium conductors are designated AxF/Ay or AxF/AyF, where AxF identifies external wires (or the envelope) and Ay or AyF identifies internal wires (or the core). Composite aluminium-steel conductors are designated AxF/Syz or AxF/SA, where AxF identifies the external aluminium wires (envelope), and Syz or SA identifies the steel core. In the designation of zinc coated steel wires, y represents the type of steel (regular, high or extra high strength) and z represents the class of zinc coating (A or B). Conductors are identified as follows: a) a code number giving the equivalent conductive section of A1F aluminium expressed in mm 2 ; b) a code number giving the area of the core material in mm 2 , if used;