TB/T 2809-2017 English PDF (TBT2809-2017)

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TB/T 2809-2017: Copper and copper alloy contact wires for electric railway
TB/T 2809-2017
TB
NATIONAL RAILWAY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.280
S 82
Replacing TB/T 2809-2005
Copper and copper alloy contact
wires for electric railway
ISSUED ON. OCTOBER 12, 2017
IMPLEMENTED ON. MAY 01, 2018
Issued by. National Railway Administration of the PRC
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Product classification ... 5 
5 Material ... 6 
6 Technical requirements ... 7 
7 Inspection methods ... 11 
8 Inspection rules and judgement of results ... 16 
9 Packaging and marking ... 18 
10 Storage and transportation... 19 
Bibliography ... 20 
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces TB/T 2809-2005 “Copper and Copper-Alloy Contact
Wires for Electric Railway”. As compared with TB/T 2809-2005, in addition to
editorial changes, the main technical changes of this Standard are as follows.
- Delete the common strength copper-silver alloy contact wire varieties (see
Table 3 of the 2005 edition);
- Delete the specifications of 85 mm2 and 110 mm2 in copper and copper
alloy contact wires (see Table 3 of the 2005 edition);
- Delete the test tension values for vibration and fatigue tests (see 6.2.2 of
the 2005 edition)
- Delete the manufacturing length (see 6.4 of the 2005 edition);
- Delete the interval of rounding off for numerical values (see 7.1.5 of the
2005 edition);
- Delete the “acceptance” (see 7.2 of the 2005 edition);
- Delete the “drum” (see 8.1 of the 2005 edition);
- Modify model development rules (see 4.1; 4.1 of the 2005 edition);
- ADD copper-chromium-zirconium alloy contact wire variety (see Table 1);
- Modify the electromechanical properties of copper-silver, copper-tin,
copper-magnesium alloy contact wires (see Table 3; Table 3 of the 2005
edition);
- ADD copper-tin alloy contact wire varieties (see Table 3);
- ADD copper-magnesium alloy contact wire varieties (see Table 3);
- ADD indoor current-carrying capacity requirements (see 6.6);
- ADD indoor straightness requirements (see 6.7);
- ADD indoor abrasion requirements (see 6.8);
- ADD internal quality requirements (see 6.9);
- Modify the inspection methods for the contact wires (see Clause 7; Clause
Copper and copper alloy contact
wires for electric railway
1 Scope
This Standard specifies the terms and definitions, product classification,
technical requirements, inspection methods, inspection rules, packaging and
marking, storage and transportation of copper and copper alloy contact wires
for electric railway (known as contact wires for short).
This Standard applies to copper and copper alloy contact wires for electric
railway contact systems.
Contact wires for overhead contact systems of urban rail transit and industrial
and mining enterprises may also refer to this Standard.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 467-2010 Copper cathode
3 Terms and definitions
The following terms and definitions apply to this document.
Contact wire
The wire in the overhead contact system of electric railway which is in contact
with a locomotive pantograph strip and transmits current.
4 Product classification
4.1 Model
Contact wire product model is classified according to copper and its alloying
element category, tensile strength grade, and nominal sectional area; and is
Refer to GB/T 3048.2. Prepare a sample with a length of 40 mm; USE buoyancy
method to measure the density of contact wire; and then calculate the cross-
sectional area.
7.3 Resistivity, conductivity test
Refer to GB/T 3048.2. USE four-end method for double-arm bridge to measure.
Before the measurement, LET the sample stand at a constant temperature of
20 °C±0.5 °C for 24 h. When measuring, the sample is mounted on a fixture;
and a current of 8 A is applied. In order to eliminate the influence of
thermoelectric potential, USE the method of switching the positive and negative
polarities of power supply to take the average to measure. If the sample surface
is dirty or rusted, it shall be treated with alcohol cotton or fine sandpaper before
measurement. If the ambient temperature does not meet 20 °C±0.5 °C (but the
ambient temperature still needs to be controlled within 20 °C±5 °C), according
to the temperature coefficient of resistance, it shall be converted to the
resistance, resistivity, or conductivity at 20 °C. The temperature coefficient of
resistance is given in Table 3.
7.4 Breaking force, tensile strength, and elongation tests
Refer to GB/T 4909.3. The gauge length of sample is 250 mm. At a speed of 20
mm/min, uniaxially STRETCH until breaking. RECORD the breaking force
value; and calculate the tensile strength. The breaking force value is the
maximum force value during the breaking of contact wire.
After aligning the two breaks of the contact wire after the break, USE a Vernier
caliper to measure the length after the break. Then the elongation is calculated.
7.5 Breaking force test after softening
After the sample is placed in a thermostat at a temperature of 300 °C±5 °C for
2 h, the sample is taken out, naturally cooled to room temperature. According
to the test method of 7.4, the breaking force test is carried out.
7.6 Torsion test
Refer to GB/T 4909.4. The gauge length of sample is 250 mm. During the test,
the tension applied is 1% of the rated breaking force. The torsion test speed is
1 r/min~10 r/min. One-way torsion of 360° is 1 loop, until the specified number
of loops is reached, or the sample is broken. RECORD the number of torsion
loops.
7.7 Reverse bend test
Refer to GB/T 4909.5. Install and clamp the sample to fix the bending point. The
bending radius is 30 mm. When starting the test, first BEND to the small arc
surface. It is counted as once when the sample is bent 180° (i.e. starting from
the original position and back to the original position). The test speed shall be
no more than 30 times/min. During the test, the bending point is carefully
observed. The number of times when the sample has a crack with a length of
about 5 mm and a depth of about 1 mm is recorded as “number of cracks”. The
number of times when the sample is completely broken is recorded as “number
of breaks”.
7.8 Winding test
Refer to GB/T 4909.7. The diameter of the winding mandrel of copper and
copper-silver alloy contact wires is φA. The diameter of the winding mandrel of
copper-tin, copper-magnesium, and copper-chromium-zirconium alloy contact
wires is 2φA. At the beginning of the test, the small arc surface faces outward;
and the great arc surface is evenly wound 3 coils inward. The sample surface
shall be free from cracks, peeling, and fracture. The test speed shall be no more
than 10 r/min.
7.9 Current-carrying capacity test
The test shall be carried out indoors, without wind and sunshine. There shall be
no objects which affect heat dissipation around.
Continuous current-carrying capacity I∞. A sample with a length of 6 m is
mounted on the test rack. A 10 kN tension is applied. A thermocouple with
compensation is used as the tem...