Transformer Impedance Definition

Transformer impedance refers to the electrical resistance inside the transformer, which is mainly composed of factors such as wire resistance, insulation material resistance, and iron loss in the magnetic circuit. Specifically, transformer impedance includes resistance, inductive reactance and capacitive reactance. When the secondary winding of the transformer is short-circuited and the rated current flows through the primary winding, the voltage applied is called the impedance voltage Uz, which is usually expressed as a percentage of the rated voltage. The size of the impedance voltage will affect the level of the secondary side output voltage when the transformer is running at full load, as well as the size of the electric force the transformer withstands when the load is short-circuited.