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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 17048-2009 Hard-drawn aluminium wire for overhead line conductors, and the following main technical changes have been made with respect to GB/T 17048-2009:
——The resistance level and section shape of hard-drawn aluminum wire has been added in the scope of application (see clause 1; 1.1 of Edition 2009);
——The resistivity and temperature coefficient of resistance of hard-drawn aluminium wires of different resistance levels at 20℃ have been added (see clause 3);
——The equivalent diameter and the tolerance on the equivalent diameter of the hard-drawn aluminium molded wire have been added (see clause 6);
——The mechanical properties of such hard-drawn aluminium round wire and hard-drawn aluminium molded wire as of different models have been added (see 11.1);
——In Annex A, A.1 "Code” has been changed to “Category code", and A.1.1 and A.1.2 have been deleted; the representation method and example of hard-drawn aluminium round wire have been modified, and the representation method and example of hard-drawn aluminium molded wire added (see Annex A; Annex A of Edition 2009).
This standard has been redrafted and modified in relation to IEC 60889: 1987 Hard-drawn aluminium wire for overhead line conductors.
Multiple structural adjustments have been made to this standard with respect to IEC 60889: 1987. Corresponding numbering equivalent clauses between this standard and IEC 60889: 1987 is given in Annex B.
There are technical deviations between this standard and IEC 60889: 1987, which are made to meet the practical needs of China's power industry:
——The resistance level of hard-drawn aluminium wire, the hard-drawn aluminium molded wire as well as its corresponding diameter range have been added in clause 1;
——Clause 2 "Normative references" has been added;
——The resistance level and corresponding electrical property requirements of Hard-drawn aluminium wire have been added In clause 3;
——The requirements for equivalent diameter and tolerance on the equivalent diameter of hard-drawn aluminium molded wire have been added in clause 6;
——The mechanical properties of hard-drawn aluminium molded wire have been added in 11.1;
——Annex A "Method for representing models of hard-drawn aluminium wires for overhead line conductors” has been added for the convenience of application of this standard.
This standard was proposed by China Electrical Equipment Industrial Association.
This standard is under the jurisdiction of the SAC/TC 422 National Technical Committee on Bare Wire of Standardization Administration of China.
The previous editions of this standard are as follows:
——GB/T 17048-1997 and GB/T 17048-2009.
Hard-drawn aluminium wire for overhead line conductors
1 Scope
This standard specifies the mechanical and electrical properties of hard-drawn aluminium round wire with nominal diameter ranging from 1.25 mm to 5.00 mm and hard-drawn aluminium molded wire with nominal equivalent diameter ranging from 2.00 mm to 6.00 mm. Hard-drawn aluminium wire is classified into four resistance levels, namely L, L1, L2 and L3. The hard-drawn aluminium wire is classified by section shape into round wire and molded wire.
This standard is applicable to hard-drawn aluminium wires for the manufacture of stranded conductors for overhead power transmission purposes.
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.
GB/T 3048.2-2007 Test methods for electrical properties of electric cables and wires - Part 2: Test of electrical resistivity of metallic materials (IEC 60468：1974，MOD)
GB/T 4909.2-2009 Test methods for bare wires - Part 2: Measurement of dimensions
GB/T 4909.3-2009 Test methods for bare wires - Part 3: Tensile test
GB/T 4909.7-2009 Test methods for bare wires - Part 7: Mandrel winding test
3 Electrical properties
The electrical properties of the hard-drawn aluminium wire shall meet those specified in Table 1. See Annex A for the method for representing models of hard-drawn aluminium wire.
Table 1 DC resistivity and temperature coefficient of resistance at 20℃
Model Maximum DC resistivity at 20℃
Ω·mm2/m(％IACS) Temperature coefficient of resistance at 20℃
1/℃
L, LX1 and LX2 0.028264 (61.0) 0.00403
L1, L1X1 and L1X2 0.028034 (61.5) 0.00407
L2, L2X1 and L2X2 0.027808 (62.0) 0.00410
L3, L3X1 and L3X2 0.027586 (62.5) 0.00413
For calculation purposes the following physical data for hard-drawn aluminium wire at 20℃ shall be used.
——Density: 2.703 kg/dm3;
——Coefficient of linear expansion: 23×106(1/℃).
4 Material
The wires shall be of aluminium of the requisite purity to achieve the mechanical and electrical properties specified hereinafter. The aluminium content shall be not less than 99.5%.
5 Surface quality
The wires shall be smooth in surface and free from all imperfections not consistent with good commodity.
6 Diameter and tolerance on diameter
The nominal diameter of the hard-drawn aluminium round wire as well as the nominal equivalent diameter of the hard-drawn aluminium molded wire shall be expressed to two decimal places.
The difference between each measured value and the nominal value of the diameter of hard-drawn aluminium round wire shall not be greater than the corresponding value specified in Table 2.
Table 2 Diameter and tolerance on diameter of hard-drawn aluminium round wire
Nominal diameter d
mm Tolerance on diameter
mm
d≤3.00
d>3.00 ±0.03
±1%d
For the purpose of checking compliance with the above requirement, the diameter shall be determined by two measurements at right angles taken at the same cross-section. The difference between each measured value and the nominal value of the equivalent diameter of the hard-drawn aluminium molded wire shall not be greater than the corresponding value specified in Table 3.
Foreword i
1 Scope
2 Normative references
3 Electrical properties
4 Material
5 Surface quality
6 Diameter and tolerance on diameter
7 Length and tolerance on length
8 Joints
9 Sampling
10 Place of testing
11 Mechanical tests
12 Resistivity test
13 Certificate of compliance
Annex A (Informative) Method for representing models of hard-drawn aluminimum wires for overhead line conductors
Annex B (Informative) Corresponding numbering equivalent clauses between this standard and IEC 60889:
Table 1 DC resistivity and temperature coefficient of resistance at 20℃
Table 2 Diameter and tolerance on diameter of hard-drawn aluminium round wire
Table 3 Equivalent diameter and tolerance on equivalent diameter of hard-drawn aluminium molded wire
Table 4 Mechanical properties of hard-drawn aluminium round wire
Table 5 Mechanical properties of hard-drawn aluminium molded wire
Table B.1 Corresponding numbering equivalent clauses between this standard and IEC 60889:
