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Aluminium Strip for Transformers

AT ISSUE There is a common misconception that a distribution transformer with copper windings is in some way more efficient, more reliable, or has higher short circuit strength when compared to a transformer with aluminum windings. RECOMMENDATION Improvements in technology regarding the use of aluminum in transformers have made aluminum-wound transformers the ideal choice for today’s applications. RATIONALE Operating Cost - Cooper Power Systems designs aluminum-wound transformers with windings of a larger cross-sectional area than would be used for a copper wound unit. This larger cross-sectional area translates to a lower current density, and an equivalent operating temperature. By reducing the current density in the windings, a low-loss design can be achieved with aluminum or copper windings. Reliability - A transformer’s life is defined by the life of its insulation system. Because Cooper aluminum-wound and copper-wound units run at equivalent operating temperatures, the insulation systems age at the same rate for each design. Lower Cost First - Whether low losses are the goal or not

Specification

Alloy	Temper	Thickness, мм	Tolerance, мм	Width, мм	Tolerance, мм
1050, 1060, 1070, 1350	О	0,2-0,4|0,4-0,8|0,9-1,1|1,2-1,6|1,8-2,5	±0,01 ±0,015 ±0,02 ±0,025 ±0,03	<100 100-200 201-500 501-1250 >1250	±0,1 ±0,2 ±0,2 ±1 ±2

Chemical Composition

Alloy	Si	Fe	Cu	Mn	Mg	Cr	Ni	Zn	Ca	V	Ti	Other	Min.Al
1050	0.25	0.40	0.05	0.05	0.05	-	-	0.05	-	0.05	0.03	0.03	99.50
1060	0.25	0.35	0.05	0.03	0.03	-	-	0.05	-	0.05	0.03	0.03	99.60
1070	0.20	0.25	0.04	0.03	0.03	-	-	0.04	-	0.05	0.03	0.03	99.70
1350	0.10	0.40	0.05	0.01	-	0.01	-	0.05	0.03	-	-	0.03	99.50