Transformer Characteristic Parameters

working frequency

Transformer core loss and the frequency of a great relationship, it should be based on the use of frequency to design and use, this frequency is called the operating frequency.

rated power

In the provisions of the frequency and voltage, the transformer can work long hours without exceeding the specified temperature rise of the output power.

Rated voltage

Refers to the transformer in the coil allows the applied voltage, the work shall not exceed the specified value.

Voltage ratio

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

No-load current

Transformer secondary open, the primary still have some current, this part of the current is called the no-load current. No-load current by the magnetizing current (to produce flux) and iron loss current (caused by the core loss) composition. For 50Hz power transformers, the no-load current is essentially equal to the magnetizing current.

Load loss

Refers to the transformer secondary open circuit, measured in the primary power loss. The main loss is the core loss, followed by no-load current in the primary copper resistance loss (copper loss), this part of the loss is small.


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

Insulation resistance

Said the transformer between the coils, the insulation between the coil and the core performance. The level of insulation resistance depends on the performance of the insulation material used, the temperature and humidity level.

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