What losses occur during operation of the transformer?

The losses during transformer operation include two parts: (1) It is caused by the iron core. When the coil is energized, the magnetic lines of force are alternating, causing eddy current and hysteresis losses in the iron core. This loss is collectively called iron loss.

(2) It is caused by the resistance of the coil itself. When current passes through the primary coil and secondary coil of the transformer, there will be a loss of electrical energy. This loss is called copper loss. The sum of iron loss and copper loss is the transformer loss. These losses are related to the transformer capacity, voltage and equipment utilization. Therefore, when selecting a transformer, you should try to make the equipment capacity consistent with the actual usage to improve equipment utilization, and be careful not to operate the transformer at light load.