Characteristic parameters of transformer 

working frequency

Transformer core loss has a great relationship with frequency, so it should be designed and used according to the frequency of use. This frequency is called the operating frequency.

rated power

Under the specified frequency and voltage, the transformer can work for a long time without exceeding the output power of the specified temperature rise.

Rated voltage

Refers to the voltage allowed to be applied to the coil of the transformer, which shall not exceed the specified value during operation.

Voltage ratio

Refers to the ratio of the primary voltage to the secondary voltage of the transformer. There is a difference between the no-load voltage ratio and the load voltage ratio.

No-load current

When the transformer secondary is open, the primary still has a certain current, and this part of the current is called no-load current. No-load current is composed of magnetizing current (generating magnetic flux) and iron loss current (caused by iron core loss). For a 50Hz power transformer, the no-load current is basically equal to the magnetizing current.