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There are many types of transformers, and it is also one of the power transmission equipment to be used in life, but in terms of their working characteristics, they are all transformer equipment made by the principle of electromagnetic induction. The following is the classification of common transformers and their main characteristics.

1. Transformers can be divided into power transformers, test electrical transformers, instrument transformers, and special-purpose transformers according to their use.

Transformers used in power systems are generally divided into two types: step-up and step-down, which are common and common transformers; transformers used in testing electric transformers to produce high voltages and high-voltage tests with electrical equipment; instrument transformers are mainly used for measurement Instruments and relay protection devices; special-purpose transformer industry includes special-purpose transformers for smelting electric furnaces, electrolytic rectification, etc.

2. It can be divided into single-phase and three-phase according to the number of transformer phases.

3. According to the winding form, it can be divided into three types: self-coupling, double winding and triple winding.

Autotransformers are mostly used to connect high-voltage, large-capacity power systems; dual-winding types are used to connect power systems with two voltage levels; three-winding types are used to connect three voltage levels, and are generally used in regional substations in power systems.

4. According to the form of iron core, it can be divided into: core type iron core and shell type iron core. The core-type iron core is mostly used in high-voltage transformers, and the shell-type iron core is mostly used in high-current special transformers.