Modification of synchronous generator cooling system control

The availability of a hydropower plant is very important. During the last few decades intermittent operation has increased, and power plants designed for base electrical energy production became the ones that cover peak power needs. This lead to greater strains on the stator package. Power generators are often very robust and can endure these new operating conditions but sometimes with reduced lifetime of stator package. Often, the main problem is a generator´s cooling system. Older synchronous generators often have cooling system control with very rough steps. This paper describes such a generator, its problems and presents a possible solution for cooling system control.