What Are The Types Of Power Transformers?

In the power system, power transformer types are an indispensable device. These transformers are mainly used in power generation, transmission, and distribution systems, and are used in photovoltaic, energy engineering, hydropower stations and other engineering construction. The classification and application fields of electrical transformer types are diverse. Below is a list of various types of transformers that power engineers may encounter.

Classification of power transformer types

According to different classifications, there are many types of power transformer types. TSTY transformer manufacturers introduce the classification of power transformer types according to various aspects such as purpose, number of windings, structure, cooling method, etc.

Classification by purpose

1. Step-up transformer: The step-up transformer is used to increase the input voltage to the required output voltage. It is used to provide high voltage supply to long-distance transmission lines or high-power equipment.
2. Step-down transformer: The input end is a higher voltage, and the high voltage is output to a relatively low voltage through the step-down transformer, thereby achieving the purpose of stepping down.
3. Distribution transformer: The distribution transformer is a power transformer type that directly supplies power to end users.
4. Plant transformer: This type of transformer is dedicated to the power plant to supply power to itself, and its short-circuit resistance is larger than that of ordinary distribution transformers.
5. Station transformer: The station transformer provides AC power to the equipment in the substation, generally a dry 30-50KVA transformer.
6. Converter transformer: For DC transmission, one side is connected to AC power and the other side is connected to the converter valve.
7. Rectifier transformer: Thermal power plant uses it to supply power to electrostatic precipitators.

Classification by the number of windings

1. Double-winding transformer: This type of transformer is a common power transformer type, containing two windings, which are coupled to each other by the magnetic flux passing through the magnetic core. Used for step-up, step-down, and factory use.
2. Three-winding transformer: Contains three windings, high-voltage side, medium-voltage side, and low-voltage side. The three windings can provide more voltage levels. Commonly used for step-down and interconnection transformers.
3. Autotransformer: A special transformer whose output and input share a set of coils. Used for step-down transformers, interconnection transformers, etc.
4. Split transformer: The high-voltage side of the transformer has only one winding, and the low-voltage side has two windings with the same voltage, impedance, capacity, and connection group.

Classification by structure

1. Single-phase transformer: The primary winding of a single-phase transformer is a single-phase winding, which converts high-voltage power supply into single-phase low voltage.
2. Three-phase transformer: Three identical single-phase transformers are properly connected or combined on a core to form a three-phase system.
3. Combined transformer: A transformer is divided into several parts and then combined on site, which is used in areas with inconvenient transportation.

Classification by insulation medium cooling method

1. Oil-immersed transformer: It uses insulating oil as cooling and insulating medium, and has advantages in cooling effect and insulation performance.
2. Dry-type transformer: The core and winding of the dry-type transformer are not immersed in insulating oil. It uses natural cooling or air cooling. Use epoxy resin or other solid insulating materials for insulation.

Classification by conductor material

1. Copper winding transformer: copper wire is used as the conductor material, with lower loss.
2. Aluminum winding transformer: aluminum wire is used as the conductor material, with lower cost but higher loss.

Classification by core type

1. Core transformer: The high-voltage winding is far from the core, and the insulation is easy to handle.
2. Shell transformer: The high-voltage winding of the shell transformer is close to the core column, and the insulation is difficult to handle.

Classification by voltage regulation method

1. On-load voltage-regulating transformer: It can maintain voltage stability and ensure power supply quality.
2. Off-excitation voltage-regulating transformer: A device that switches the coil taps in the winding to achieve voltage regulation when the transformer is not energized. Simple structure and low cost.

The above are several common power transformer types. TSTY is a transformer manufacturer and provider with 15 years of production, manufacturing and R&D. If you want to know more about transformers, please contact us.