The Characteristic Parameters Of The Power Transformer

1. 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 operating frequency.

2. 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

3. Rated voltage

It means that the voltage allowed to be applied to the coil of the transformer shall not be greater than the specified value during operation.

4. Voltage ratio

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

5. No-load current

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

6. No-load loss

Refers to the power loss measured in the primary when the secondary of the transformer is open circuited. The main loss is the core loss, followed by the loss (copper loss) caused by the no-load current on the copper resistance of the primary coil. This part of the loss is very small.

7. Efficiency

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

8. Insulation resistance

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 insulating material used, the level of temperature and the degree of humidity.