Calculation of negative-sequence losses and negative-sequence resistance of turbogenerators

The negative-sequence losses and their calculation are of great significance for large turbogenerators having high utilization factors. A generalized method for the determination of negative-sequence losses and negative-sequence resistance is given. With the help of equivalent circuits, accounting for all the given constructional particularities of the rotor, the influences of the construction of damper winding, wedges and massive rotor are thoroughly investigated and explicated. These studies yield indications on the mode of participation of the damper winding during steady state as well as transient unbalanced loading.