Analysis to the Reliability of Evaporative Cooling Turbo generator in Power System

Evaporative cooling technique is successfully applied for large turbo generator following the air-cooled, hydrogen-cooled and water-cooled techniques. Compared with the three techniques, evaporative cooling technique absorbs the heat of thermal parts of generator by vaporization latent heat of coolant, which is sharply more efficient than the specific heat cooling approaches. The temperature rise of evaporative cooling generator can be controlled really, and the ventures of generator which are charged of higher temperature rise could be avoided. The coolant is one of ideal insulating, nonflammable and nontoxic liquid, which likes an armor of generator. This paper shows the character of coolant, electrical safety, temperature rise controlling, affecting of power grid faults for generator, and analyzes that the evaporative cooling technique improves the reliability of turbo generator, which is beneficial to the safety of power system.