GB/T 30552-2014 PDF English
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Aluminium alloy wires for conductors of insulated cables
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GB/T 30552-2014: PDF in English (GBT 30552-2014) GB/T 30552-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.10
K 11
Aluminium alloy wires for conductors of insulated cables
ISSUED ON: MAY 06, 2014
IMPLEMENTED ON: OCTOBER 28, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Product naming and representation ... 5
5 Specification ... 5
6 Materials ... 6
7 Appearance ... 6
8 Size deviation ... 6
9 Mechanical properties ... 7
10 Resistivity ... 7
11 Delivery requirements ... 8
12 Acceptance rules ... 8
13 Packaging and marking ... 9
Annex A (normative) Tensile test clamping method ... 10
Annex B (informative) Compressive creep test method ... 11
Aluminium alloy wires for conductors of insulated cables
1 Scope
This Standard specifies product model, specifications, materials, electrical and
mechanical properties, test methods, inspection rules, packaging and marking of
aluminium alloy wires for conductors of insulated cables.
This Standard is applicable to the manufacture of aluminum alloy wires with rated
voltage of 0.6kV~1kV aluminum alloy conductors and XLPE insulated cable
conductors.
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
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 16825.2-2005, Verification of static uniaxial testing machines - Part 2:
Tension creep testing machines - Verification of the applied force
GB/T 20141-2006, Overhead electrical conductors - Formed wire, concentric lay,
stranded conductors
GB/T 20975 (all parts), Methods for chemical analysis of aluminium and aluminium
alloys
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 20141-
2006 as well as the followings apply.
3.1 cross-section shape
The shape of a single wire cross section. The cross-section shape of aluminium alloy
wires for conductors of insulated cables is divided into two types: circular cross-section
and special-shaped cross-section.
3.2 nominal value
A nominal or flag value of a measurable performance, used to mark a single line and
give a tolerance.
3.3 equivalent wire diameter
The diameter of a circular single wire with the same cross-section area, mass and
resistance as the profiled wire of the same material and condition.
[GB/T 20141-2006, definition 3.5]
4 Product naming and representation
Aluminium alloy wires for conductors of insulated cables are indicated by model, state,
specification and serial number of this Standard. The representation method is as
follows:
Example: The aluminium alloy wire for conductors of insulated cables, of which the
nominal equivalent wire diameter is 3.000mm, the composition code is 1, the state is
soft, is expressed as:
DLH1/R-3.000 GB/T 30552-2014
5 Specification
The specification of aluminium alloy wires for conductors of insulated cables is
expressed by nominal diameter or nominal equivalent wire diameter. The range shall
comply with the provisions of Table 1.
Table 1 -- Model specifications of aluminium alloy wires for conductors of
Reference to this Standard
Specification [□ is the nominal diameter or the
nominal equivalent wire diameter, in millimeters
(mm)]
State (□ is soft state R or hard state Y)
Model (DLH means the aluminium alloy wires for
conductors of insulated cables, □ means component
code of 1, 2, 3, 4, 5, 6)
B.2.3 Use a heating device to heat the specimen to the specified temperature for the test.
The allowable deviation between the specified temperature and the displayed
temperature shall not be greater than ±3℃. The maximum allowable temperature
deviation in the length direction of the specimen is 3°C. The resolution of the
temperature display device shall be at least 0.5℃. The accuracy of the temperature
measuring device shall be equal to or better than 1°C. The temperature drift of the
thermocouple during the calibration period shall not exceed ±1°C.
B.2.4 The working surfaces of the upper and lower platens of the testing machine shall
be parallel. The parallelism within 100mm of the specimen installation area shall not
be less than 1:0.0002mm/mm. During the test, there shall be no lateral relative
displacement and rotation between the upper and lower pressing plates. The hardness
of the pressing plate shall not be lower than 55HRC.
B.3 Test method
B.3.1 The temperature of compressive creep test shall be 50℃~120℃. The test
compressive stress shall not be greater than the yield strength of the specimen. The
compressive stress shall not be less than 70% of the yield strength.
B.3.2 Place the specimen vertically between the upper and lower pressing plates of the
creep endurance testing machine. When the specimen is installed, adjust the specimen
to make its longitudinal axis coincide with the longitudinal axis of the pressure plate.
Close the environmental chamber. Heat the specimen to the specified test temperature.
To thermally equilibrate the specimen, gripping device, and extensometer, the specimen
shall be held at least 30min before the test force is applied. When testing with an
installed extensometer, a certain initial load (less than 10% of the test force) can be
applied during the heating process to maintain the coaxiality of the loading chain of the
specimen (for example, before t=0).
B.3.3 The test force shall be applied in the axial direction of the specimen in such a way
that the minimum bending moment and torque are produced. The test force shall be
accurate to at least ±1%. The application of the test force shall be vibration-free and as
fast as possible. When the load corresponding to the test stress is fully applied to the
specimen, start the creep test (t=0) and record the creep deformation. Carry out the
compressive creep test for 100h. The load shall be kept constant during the test. The
temperature fluctuation shall not be greater than ±3℃.
B.4 Data record
Creep deformation data shall be recorded continuously, or enough data shall be
recorded throughout the test to draw a "creep strain-time" curve. On the logarithmic
axis of creep strain versus time, the collected data will be close to a straight line. To
make the data collection points evenly distributed along the fitted line, when plotting
creep curves, within the first 20h after the start of the test, the creep data shall be taken
at 20min intervals. After 20h, the creep data shall be taken at the time interval of
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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