Transformer

1. Operating frequency

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

2. Rated power

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

3. Rated voltage

Refers to the voltage that is allowed to be applied on the coil of the transformer, and shall not be greater than the specified value when working.

4. Voltage ratio

Refers to the ratio of the primary voltage and secondary voltage of the transformer, and has the difference between the no-load voltage ratio and the load voltage ratio.

5. No load current

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

6. No load loss

Refers to the transformer secondary open circuit, measured at the primary power loss. The main loss is the loss of the iron core, followed by the loss of the no-load current on the copper resistance of the primary coil (copper loss), which is very small.

7. Efficiency

Refers to the ratio of secondary power P2 to primary power P1. Usually the larger the rated power of the transformer, the higher the efficiency.

8. Insulation resistance

It indicates the insulation performance between the coils of the transformer and between the coils and the iron core. The level of insulation resistance is related to the performance of the insulation material used, the temperature level and the degree of humidity.