Transformer technology, voltage ratio and efficiency

For different types of transformers have the appropriate technical requirements, can be expressed with the corresponding technical parameters. Such as the main technical parameters of pole mounted transformers are: rated power, rated voltage and voltage ratio, rated frequency, operating temperature level, temperature, voltage regulation, insulation and moisture resistance for low-frequency transformer main technical parameters are: Frequency characteristics, nonlinear distortion, magnetic shielding, electrostatic shielding, efficiency and so on. Transformer voltage than the two sets of transformer coils were N1 and N2, N1 for the primary, N2 secondary. In the primary coil with an AC voltage, in the secondary coil will have induced electromotive force at both ends.When N2> N1, the induced electromotive force than the primary plus the voltage is higher, this kind of transformer called the step-up transformer: When N2 is the voltage ratio (turns ratio), when n <1, then N1> N2, U1> U2, the transformer step-down transformer.