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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 (mm)	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.