Sustainable Mining and Metallurgy

Combining with the features of non-ferrous metal processing industry, this paper discussed the transformer loss and its calculation method. The total active power loss, reactive power loss and active energy loss of SCB11, SCB12 and SCB13 transformers were calculated. Taking SCB11 as baseline, this paper also calculated the payback period of the excess cost of selecting SCB12 and SCB13 transformers. Taking SCB9 as an example, the power saved through replacing high energy consumption transformer to SCB11, SCB12 and SCB13 were also calculated. The calculation results showed that the latest energy-saving transformer should be selected for new construction projects in high electricity price areas; in low electricity price areas, the latest energy-saving transformers should be selected as much as possible if available. Replacing high energy consumption transformer can save a lot of electric energy every year, and the larger the transformer capacity, the more electric energy can be saved. It was suggested that enterprises should replace the high energy consumption transformer with the latest energy-saving transformer with the opportunity of technical transformation and upgrading or site relocation in combination with enterprise development planning.