Characteristic parameters of EI low frequency transformer

Characteristic parameters of EI low frequency transformer

working frequency

The core loss of EI low frequency transformer 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.

Load loss

Refers to the power loss measured at the primary of the transformer when the secondary of the transformer is open. 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.

Efficiency of EI low frequency transformer

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

Insulation resistance

It indicates the insulation performance between each coil of the transformer and between each coil and the iron core. The insulation resistance is related to the performance, temperature and humidity of the insulating material used.