The role of the transformer

Power transformers are one of the main equipment in power plants and substations. The role of the transformer is multi-faceted not only to increase the voltage to send electrical energy to the electricity consumption area, but also to reduce the voltage to the voltage used at all levels to meet the needs of electricity. In short, both step-up and step-down must be completed by a transformer. In the process of power system transmission of electric energy, two parts of voltage and power will inevitably be lost. When the same power is delivered, the voltage loss is inversely proportional to the voltage, and the power loss is inversely proportional to the square of the voltage. The transformer is used to increase the voltage, and the power transmission loss is reduced.
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 installation location of the transformer should be considered for ease of operation, maintenance and transportation, and a safe and reliable place should be selected. When using a transformer, the rated capacity of the transformer must be selected reasonably. When the transformer is running at no load, a larger reactive power is required. These reactive power must be supplied by the power supply system. If the capacity of the transformer is too large, it will not only increase the initial investment, but also keep the transformer in no-load or light-load operation for a long time, which will increase the proportion of no-load loss, reduce the power factor, and increase the network loss. This operation is neither economical nor uneconomical. reasonable. If the transformer capacity is too small, the transformer will be overloaded for a long time and the equipment will be easily damaged. Therefore, the rated capacity of the transformer should be selected according to the needs of the electrical load, and should not be too large or too small.