Electromagnetic modelling of existing large hydro generator

Abstract

The electromagnetic modelling of existing large hydro generator is the main focus of this paper. Electromagnetic commercial software was used where all geometrical parameters of the generator are taking into account such as: pole face geometry, air gap size, the slots geometry and pattern winding sequence. The approach used to model the machine and some simulation results are presented in this paper. The analysis of a 122.6 MVA, 60 poles, 13.8 kV generator is presented as a case study on how advanced electromagnetic numerical field simulations are employed to evaluate generator parameters and performances.

Open-circuit and short-circuit core losses computation in a large hydro generator

“…It can be observed in this case that the flux density magnitude did not exceed 1.2 Tesla for all sensors. Many other core loss models were proposed in the last decade [5][6][7][8][9][10][11] that considered the Steinmetz model as a base for the iron separation method. The recent time-domain dynamic core loss model proposed recently in [6] is used in this case study to compute the magnetic core losses.…”

“…The time-domain dynamic-core loss model proposed in [6] was initially applied to compute instantaneous core losses in small electromagnetic devices in both twodimensional and three-dimensional finite element analysis. The model proposed in [6] was extended [7][8][9][10] to compute the magnetic-core losses and their corresponding spatial distribution in large hydroelectric generators.…”