There are transformers which are classified depending upon the applications they have. Many of these transformers are large and bulky. Most of them are used by the Electricity department.

Power Transformers

The Power transformers are used in high power transfer applications for both step-up and step-down applications, where the operating voltages are more than 33KV generally rated above 200MVA. The flux density is much higher for them.

All the transformers that are used for power control applications such as laminated core transformers, toroidal transformers, variable auto transformers, polyphaser transformers, stray leakage transformers come under this category.

These are usually big in size depending upon the power handling capacity and its application. These transformers are available in three phase or single phase type. As these transformers are bulky, they are placed in large open area. These transformers tend to provide 100% efficiency in full load applications.

Advantages

• They have high insulation level.
• Noise is low.
• They are highly efficient.
• High voltage rated ones to handle high power applications.

Applications

• They are used in power generation systems.
• They are used in transmission sub stations.