GB/T 12971.2-2008 PDF in English
GB/T 12971.2-2008 (GB/T12971.2-2008, GBT 12971.2-2008, GBT12971.2-2008)
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| GB/T 12971.2-2008 | English | 150 |
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Trolley and contact wires for electric traction -- Part 2: Aluminium and steel composite trolley and contact wires
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Trolley and contact wires for electric traction - Part 2: Aluminium and steel composite contact wires
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Newer version: GB/T 12971.2-2023 Standards related to: GB/T 12971.2-2023
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GB/T 12971.2-2008: PDF in English (GBT 12971.2-2008) GB/T 12971.2-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.060.10
K 11
Replacing GB 12971.1-1991, GB 12971.3-1991
Trolley and Contact Wires for Electric Traction - Part 2.
Aluminum and Steel Composite Trolley and Contact Wires
ISSUED ON. JUNE 30, 2008
IMPLEMENTED ON. APRIL 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope .. 4
2 Normative References ... 4
3 Models ... 5
4 Specification ... 5
5 Materials ... 8
6 Test ... 8
7 Package and Marking ... 10
8 Storage and Transportation ... 11
Appendix A (Normative) Technical Requirements for Steel Profiles Semi-
Products .. 12
Appendix B (Normative) Technical Requirements for Aluminium Profiles Semi-
Products .. 13
Appendix C (Normative) Binding Force Test Method of Aluminium and Steel
Composite Contact Wires ... 14
Foreword
GB/T 12971 Trolley and Contact Wires for Electric Traction can be divided into the
following two parts.
--- Part 1. Copper and Copper-Alloy Contact Wires;
--- Part 2. Aluminum and Steel Composite Trolley and Contact Wires.
This Part belongs to Part 2 of GB/T 12971.
This Part replaced GB 12971.3-1991 Trolley and Contact Wires for Electric Traction –
Part 3. Aluminum and Steel Composite Trolley and Contact Wires; and enroll relevant
contents of GB 12971.1-1991 into this Part.
Compared with GB 12971.3-1991, this Part has the major changes as follows.
--- Add the normative references (Clause 2 of this edition);
--- Modify the test requirements (Clause 4 of previous edition; Clause 6 of this
edition);
--- Add the requirements for package and marking (Clause 7 of this edition);
--- Add the requirements for transportation and storage (Clause 8 of this edition);
The Appendix A, B, C in this Part are normative.
This Part was proposed by China Electrical Equipment Industrial Association.
This Part shall be under the jurisdiction of National Technical Committee for
Standardization of Wires and Cables (SAC/TC 213).
Drafting organizations of this Part. Shanghai Electric Cable Research Institute.
Participating drafting organizations of this Part. Tai’an Electric Trolley Wire Factory,
Tai’an Huaxun Electric Trolley Wire Co., Ltd., Hebei Xingtai Cable Co., Ltd., Shanghai
Cable Works Co., Ltd., and Liaoning Fushi Copper Co., Ltd.
Chief drafting staffs of this Part. Liu Bin, Duan Pengzheng, Zhang Xiuqin, Meng
Guangji, Xie Qilin, and Wang Daxin.
The historical editions replaced by this Standard are as follows.
--- GB 12971.1-1991;
--- GB 12971.3-1991.
Trolley and Contact Wires for Electric Traction - Part 2.
Aluminum and Steel Composite Trolley and Contact Wires
1 Scope
This Part of GB/T 12971 specifies the product models, specifications, materials, test,
package and marking, transportation and storage, etc. of aluminum and steel
composite trolley and contact wires.
This Part is applicable to the aluminum and steel composite trolley and contact wires
used for electric transport, lifting system in the railways, mining, urban traffic, etc.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Part of GB/T 12971. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Standard,
however, parties who reach an agreement based on this Standard are encouraged to
study if the latest versions of these documents are applicable. For undated references,
the latest edition of the referenced document applies.
GB/T 1196-2002 Unalloyed Aluminum Ingots for Re-melting
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 60648.1974,
MOD)
GB/T 4909.2-1985 Test Methods for Bare Wires – Part 2. Measurement of
Dimensions
GB/T 4909.3-1985 Test Methods for Bare Wires – Part 3. Tensile Test
GB/T 4909.4-1985 Test Methods for Bare Wires – Part 4. Torsion Test
JB/T 8137.2-1999 Delivery Drums for Electric Wires and Cables - Part 2. Wood
Delivery Drums
JB/T 8137.4-1999 Delivery Drums for Electric Wires and Cables - Part 4. Steel
Shapes Composite Delivery Drums
5 Materials
The materials of aluminum and steel composite contact wires shall conform to the
following provisions.
Steel shall conform to the provisions of Appendix A in this Part.
Aluminum shall conform to the provisions of Appendix B in this Part.
6 Test
6.1 Test classification
The test can be divided into type test and routine test.
The type test is mainly used for inspecting the major performance of contact wires; its
performance mainly depends on the design of contact wires. For the newly-designed
contact wires or the contact wires produced by new production processes, the test is
only carried out once; and the test can only be repeated when the design and
production process change.
The type test can only be carried out on the contact wires that meet all the requirements
for routine test.
The routine test is carried out for ensuring the quality of contact wires, and meeting the
requirements of this Part.
6.2 Type test
6.2.1 Comprehensive breaking force
The comprehensive breaking force of contact wires shall pull the tensile tester which
is fixed on a proper position, with accuracy of ±1%; the effective gauge length is
250mm; the comprehensive breaking force test shall be carried out as per the GB/T
4909.3-1985; the test results shall meet the requirements of Table 3.
6.2.2 Binding force
The binding force test of contact wires shall be carried out as per the specified method
of Appendix C; the effective gauge length for the specimen of binding force test shall
be 100mm; the test results shall meet the requirements of Table 3.
6.2.3 Torsion
The torsion test shall be carried out as per the GB/T 4909.4-1985; the test speed is
15r/min ~ 20r/min; 180° repeated torsion; the effective gauge length of specimen is
contact wire.
7.2 Marking
7.2.1 Each coil of the contact wire shall have the firm mark that is easy to find; and
the following contents shall be indicated.
a) The name of the manufacturer;
b) Product name;
c) Product model;
d) Manufacturing standard;
e) Length;
f) Gross weight and net weight (kg);
g) Exit-factory No. and production date (year, month, day);
h) The arrow for wire-placing direction of the contact wires.
7.2.2 Each coil of contact wires shall be attached the following accompanying
documents.
a) Product certification;
b) Such coil products’ exit-factory number, production date, model, this Standard
number, length, and net weight.
8 Storage and Transportation
8.1 The coil loaded with contact wires is strictly prohibited to be thrown from the high
place during the transporting process, neither the mechanical damage or abrasion of
product surface is allowed.
8.2 The coil is not allowed to place horizontally, neither it is allowed to lift or transport
in the horizontal mode, so as to prevent the damage of coil or the sequence confusion
of the contact wires.
8.3 The rotating direction of the coil shall be opposite to the wire-placing arrow
direction.
Appendix B
(Normative)
Technical Requirements for Aluminium Profiles Semi-Products
B.1 The aluminum profile shall be made of the “Special No.1 Aluminum” specified in
GB/T 1196-2002.
B.2 The cross-section shape, dimension and deviation of aluminum profiles shall
make the aluminum and steel composite contact wires conform to the relevant
provisions of this Part.
B.3 The resistivity of aluminum profiles at 20°C shall be no greater than 0.028264
Ω•mm2/m.
B.4 The shape of aluminum profiles shall be symmetrical, the surface shall be flat
and smooth; be free of cracks, creases, dents, bubbles and deeper grooves.
B.5 After cold-rolling, the tensile strength of aluminum profiles shall be no less than
103MPa; the elongation at break shall be no less than 6%; the tensile strength on the
welding place shall be no less than 90% of the above tensile strength.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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