Power transformers are one of the main equipments in power plants and substations. The role of the transformer is not only to increase the voltage to send electricity to areas where electricity is used, but also to reduce the voltage to various levels of voltage to meet the needs of electricity use. In short, both boost and buck must be done by the transformer. In the process of transmitting electrical energy in the power system, there will inevitably be two parts of voltage and power loss. When the same power is transmitted, the voltage loss is inversely proportional to the voltage, and the power loss is inversely proportional to the square of the voltage. Using transformers to increase voltage reduces transmission losses.
The transformer is composed of two or more coil windings wound on the same core. The windings are connected by alternating magnetic fields and work according to the principle of electromagnetic induction. Transformer installation location should be considered for ease of operation, maintenance and transportation, and should choose a safe and reliable place. When using a transformer, the rated capacity of the transformer must be properly selected. When the transformer is idling, it requires a large amount of reactive power. These reactive powers are supplied by the power supply system. If the capacity of the transformer is chosen too large, not only the initial investment is increased, but also the transformer is put into no-load or light-load operation for a long time, so that the proportion of no-load loss increases, the power factor decreases, and the network loss increases. This operation is neither economical nor efficient. reasonable. Transformer capacity selection is too small, it will overload the transformer for a long time and it is easy to damage the equipment. Therefore, the rated capacity of the transformer should be selected according to the needs of the power load and should not be too large or too small.