Electromagnetic losses computation in existing large hydro electrical generators

The hydroelectric generation industry faces two related challenges: increasing the output the existing hydro electrical generators but without reducing the reliability of these aging facilities. Many aspect of hydroelectric generator should be considered during any up-rate study. Magnetic losses of the stator and rotor core may change significantly with any load increase. The open and short circuit core losses are major components in the efficiency and temperature rise calculations for any considered up-rate. Advanced numerical methods are used to determine different magnetic losses in the considered hydro electrical generator before any upgrade. Magnetic core losses results will be discussed in this present paper.