Brief introduction: Principle and application of three-phase auto transformer

Three-phase auto transformer is a special transformer, its winding primary and secondary are in the same tuning winding, that is, only one winding transformer, it is the output and input share a group of coils of the special transformer. This type of transformer is usually used for safe voltage sites and stability control of power systems. Follow Suttons STS to understand the principle and application of three-phase autotransformers.
The role of three-phase auto transformer:

1. Voltage conversion: Like ordinary transformers, three-phase auto transformers can raise or lower the circuit voltage. In power systems, autotransformers are often used for voltage boost and voltage drop to adapt to the voltage requirements of different electrical equipment and transmission lines.

2. Flexible control: the three-phase auto transformer can be made into an AC voltage regulator, which can meet different needs by changing the output voltage and is convenient to use in laboratories and other places.

Principle of three-phase auto transformer:

A three-phase auto transformer is a special type of transformer in which the primary and secondary coils share a single set of coils. The output voltage can be changed by changing the turn ratio. When used as a step-down transformer, a part of the turns is drawn from the winding as a secondary winding; When used as a booster transformer, the applied voltage is only applied to a partial turn of the winding. Its working principle is the same as that of ordinary transformers, which are based on the principle of electromagnetic induction.
Application industry of three-phase auto transformer:

1. Power industry: In power systems, three-phase autotransformers are widely used to raise or lower voltage to meet the needs of different equipment. In power plants, for example, autotransformers are used to connect generators to the grid; In substations, autotransformers are used to regulate the voltage of the grid.

2. Industrial manufacturing: In industrial manufacturing, three-phase autotransformers are often used to provide a stable voltage that meets the needs of equipment. For example, in the steel, petrochemical, paper and other industries, autotransformers are used to drive large electric motors and pumps.

3. Transportation: In rail, subway and light rail systems, three-phase autotransformers are used to convert high-voltage power into lower voltage for use by trains and vehicles.

4. Urban infrastructure: In urban power supply, water supply, gas supply and other systems, three-phase autotransformers are used to adjust and stabilize pressure and flow.

5. Scientific research and education: In laboratories and research institutions, three-phase autotransformers are used to provide adjustable and stable power supplies for various research and experiments.

6. Defense and security: In military installations and security systems, three-phase autotransformers are used to ensure the stability and safety of the power supply.

In general, the role of the three-phase autotransformer is to carry out voltage conversion, impedance matching and flexible control, and its principle is based on electromagnetic induction and mutual inductance between the windings. This kind of transformer is widely used in power system, and has the advantages of small volume, less consumables and high efficiency.