The generator in the power plant are designed for continuous operation. Thus, the cooling system plays an important role in order to keep it's reliability. Generators used in power generation applications can be placed in three major design classifications based on the cooling medium used:
- Open ventilated (OV) - In the OV design, outside air is drawn directly from outside the unit through filters, passes through the generator and is discharged outside the generator.
- Totally enclosed water to air cooled (TEWAC)- In the TEWAC design, air is circulated within the generator, passing through frame-mounted air to water heat exchangers. In this process, the water is circulating and enters the heat exchanger that cools down the air which directly penetrate the internal part of the generator.