The role and principle of the transformer

Transformer is a kind of electrical equipment used for power conversion. It is an indispensable and important device in the power grid. It can convert AC power of one voltage and current into AC power of another voltage and current of the same frequency. Transformers are used in all electronic products. Its principle is simple, but the winding process of the transformer will have different requirements according to different use occasions (different purposes). The main functions of the transformer are: voltage transformation; impedance transformation; isolation, voltage stabilization (magnetic saturation transformer), etc., The core shapes commonly used in transformers generally have E-type and C-type cores. Transformer.png In different environments, transformers have different uses, such as: 1. Increase the voltage during long-distance transmission to reduce power loss on the line 2. Reduce the voltage when it reaches the use area to meet the power needs of different users 3. The use of transformer connection during impedance matching can change the impedance. 4. The use of isolation transformers can isolate the two phases to prevent electric shock accidents. The general classification of transformers can be summarized as follows: 1. According to the number of phases: 1) Single-phase transformer: used for single-phase loads and three-phase transformer groups. 2) Three-phase transformer: used to increase and decrease the voltage of a three-phase system. 2. Divided by cooling methods: 1) Dry-type transformers: rely on air convection for natural cooling or increase fan cooling, which are mostly used for small-capacity transformers such as high-rise buildings, high-speed toll stations, local lighting, and electronic circuits. 2) Oil-immersed transformer: Relying on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooling, oil-immersed water-cooling, forced oil circulation, etc.