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J. Bacher, C. Grabner, E. Schmidt:
"A Field Plot of a Turbo Generator with a Massive Rotor on the Basis of the Actual Current Distributions during a Sudden Short Circuit";
Vortrag: IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), Winnipeg CA; 12.05.2002 - 15.05.2002; in: "Proccedings of the IEEE Canadian Conference on Electrical and Computer Engineering (CCECE)", Vol.I (2002), ISBN: 07803-7514-9; S. 166 - 171.

A well known fact is, that there is a significant difference between the calculated and the measured reactance values of a turbo generator with a massive rotor. This difference can be minimised on the basis of an extended mathematical model which considers the influence of the eddy currents in the massive parts of the machine. The effects of the eddy currents in the massive rotor can be modelled by an additional complete damper cage. For a standard built damper cage there are analytic formulas for its parameters. But for a damper cage which should be replace the effects of the eddy currents in the massive rotor, the parameter identification is difficult because the calculation of the eddy current distribution in the rotor teeth
is complex. This is the reason why the parameters of this second damper cage will be found by field plots of the machine. These field plots base on currents which are measured during a sudden short circuit.