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ABSTRACT
A two-dimensional finite-element method of obtaining the magnetic field and eddy currents distribution, and the power loss therefrom, in the cross-section of a turbogenerator rotor during transient unbalanced operation is presented. The symmetrical component of the decaying stator fault current is represented in various time steps by ‘steady’ currents of constant amplitude. The transient heat conduction equation is solved simultaneously for the same finite-element configuration of the rotor to give the temperature rise distribution in its various part3. The method is applied to the study of a BH8L built 120 MW turbogenerator where, by a simplifying procedure, the average temperature rise on the pole surface calculated by the present method is used to predict the temperature rise at the ends of transverse slots.