A power transformer is a stationary electrical device, and is a device for changing an AC voltage (current) of a certain value to another voltage or a voltage (current) of the same frequency.
The transformer is composed of two or more coil windings wound on the same iron core. The windings are connected by an alternating magnetic field and work according to the principle of electromagnetic induction. The transformer installation position should be considered for ease of operation, maintenance and transportation. , At the same time should choose a safe and reliable place.
When using a transformer, the rated capacity of the transformer must be used reasonably. When the transformer is unloaded, a large amount of reactive power is required. These reactive powers must be supplied by the power supply system. If the capacity of the transformer is too large, it will not only increase the initial power. Investment, and long-term transformers in no-load or light-load operation, so that the proportion of no-load losses increased, power factor decreases, network losses increase, this operation is neither economic nor unreasonable. Transformer capacity selection is too small, will make the transformer long-term Overloading, easy to damage the equipment. Therefore, the rated capacity of the transformer should be selected according to the needs of the power load, should not be too large or too small.