Transformer characteristic parameters

working frequency

The loss of transformer core is closely related to frequency, so it should be designed and used based on the frequency of use, which is called the working frequency.

Rated power

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

Rated voltage

The voltage allowed to be applied on the coil of a transformer during operation shall not exceed the specified value.

Voltage ratio

Refers to the ratio of the primary voltage to the secondary voltage of a transformer, which differs between the no-load voltage ratio and the load voltage ratio.

No-load current

When the secondary circuit of the transformer is open, there is still a certain amount of current in the primary, which 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 magnetization current.

No-load loss

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

efficiency

The percentage of the ratio of secondary power P2 to primary power P1. Usually, the higher the rated power of a transformer, the higher its efficiency.

insulation resistance

Indicates the insulation performance between the coils of a transformer and between the coils and the iron core. The level of insulation resistance is related to the performance, temperature, and humidity of the insulation materials used.