Autotransformer and Voltage Transformation Ratio

Autotransformer is a type of transformer in which the primary and secondary windings share a common winding. The transformer operates on the principle of electromagnetic induction and is used to transfer electrical energy from one circuit to another.

The voltage transformation ratio (K) of a transformer is defined as the ratio of the secondary voltage to the primary voltage. The autotransformer is preferably employed in situations where the voltage transformation ratio (K) is near unity.

Reasons for employing Autotransformer with Near Unity Voltage Transformation Ratio

There are several reasons why an autotransformer is preferred in situations where the voltage transformation ratio (K) is near unity. These include:

1. Efficiency: Autotransformers are more efficient than other types of transformers because they use fewer windings. This means that there are fewer losses due to resistance in the windings, and the transformer can operate at higher efficiency.

2. Size: Autotransformers are smaller and lighter than other types of transformers, making them easier to transport and install.

3. Cost: Autotransformers are less expensive than other types of transformers because they require fewer materials and are easier to manufacture.

4. Voltage regulation: Autotransformers are better suited for applications where a high degree of voltage regulation is required. This is because they can provide a more precise output voltage, even when the input voltage varies.

5. Low voltage applications: Autotransformers are better suited for low voltage applications because they can provide a higher output voltage than other types of transformers with the same input voltage.

Conclusion

In conclusion, the autotransformer is preferred in situations where the voltage transformation ratio (K) is near unity because it is more efficient, smaller, less expensive, better suited for voltage regulation, and better suited for low voltage applications.