Calculation and analysis of the loss and heat on damper bars in large tubular hydro-generator

Abstract

Abstract:In order to research the losses and heat of damper bars thoroughly, a multislice moving electromagnetic field-circuit coupling FE model of tubular hydro-generator and a 3D temperature field FE model of the rotor are built respectively. The factors such as rotor motion and non-linearity of the time-varying electromagnetic field, the stator slots skew, the anisotropic heat conduction of the rotor core lamination and different heat dissipation conditions on the windward and lee side of the poles are considered. Furthermore, according to the different operating conditions, different rotor structures and materials, compositive calculations about the losses and temperatures of the damper bars of a 36 MW generator are carried out, and the data are compared with the test. The results show that the computation precision is satisfied and the generator design is reasonable.

Influence factors to affect eddy current loss of damper winding in 24 MW bulb tubular turbine generator

“…The internal factors are mainly related to generator structure design. Some experts and scholars have made related researches on the eddy current loss of damper bars in generator (Liao et al , 2013; Keller et al , 2007). The generator performance is improved when shifting the center of the pole shoes or/and the damper bars (Han et al ., 2008).…”