Technology
This standard is in strict accordance with GB / t18813-2014, and specifies the requirements, test methods, inspection rules, marks, packaging, transportation, storage and contract contents of copper strip for transformer. This standard is applicable to copper strip for winding transformer coil.
Table 1 brand, state and specification of strip
Brand
Supply status
Specifications
Thickness(mm)
Width(mm)
TU1,T2
M(060)
0.1～＜0.50
≤820
0.50～3.50
≤820
Note: other grades, states and specifications can also be supplied after negotiation between the supplier and the supplier
Table 2 allowable deviation of strip thickness
Thickness
Width(mm)
≤200
＞200～400
＞400～600
＞600～820
Thickness tolerance/±
Ordinary grade
High precision
Ordinary grade
High precision
Ordinary grade
High precision
Ordinary grade
Higher level
0.1～0.20
0.010
—
0.010
—
0.010
—
—
—
＞0.20～0.30
0.015
0.010
0.020
0.010
0.020
0.010
—
—
＞0.30～0.50
0.020
0.015
0.025
0.020
0.030
0.020
—
—
＞0.50～0.70
0.030
0.025
0.035
0.030
0.040
0.035
0.050
0.040
＞0.70～1.10
0.035
0.030
0.040
0.035
0.045
0.040
0.060
0.050
＞1.10～1.50
0.045
0.040
0.045
0.040
0.050
0.045
0.070
0.050
＞1.50～2.50
0.050
0.045
0.055
0.050
0.070
0.060
0.090
0.080
＞2.50～3.00
0.055
0.050
0.060
0.055
0.080
0.070
0.100
0.090
Table 3 width of strip and allowable deviation of width
Width
Thickness
≤1.0
＞1.0～1.5
＞1.5～2.5
Thickness tolerance/±
Ordinary grade
Higher level
Ordinary grade
Higher level
Ordinary grade
Higher level
≤100
0.20
0.10
0.30
0.20
0.40
0.25
＞100～300
0.30
0.15
0.40
0.25
0.50
0.30
＞300～820
0.50
0.30
0.60
0.40
0.60
0.50
Note: when the demander requires one-way deviation, the value should be twice of the value in the table.
Table 4 mechanical properties of strip
Brand
State
Tensile strength
Rm/MPa
Elongation
A11.3/%
Vickers hardness
HV
TU1,T2
M(060)
195～260
≥35
45～65
Note: for the strip with thickness less than 0.20 mm, the test results are for reference only.
Table 5 electrical properties of strip (20 ℃)
Brand
Conductivity/
%IACS
Resistance coefficient/
Ω·mm²/m
TU1
≥100
≤0.017 241
T2
≥98
≤0.017 593
Note: either conductivity or resistance coefficient shall be selected and indicated in the contract. If not specified, the conductivity shall be tested.
Conductivity = 100% × 0.017241 / measured value of resistance coefficient.