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The aging of generators is intimately associated with the hotspot temperature of the stator windings groundwall insulation. Common resistive thermal detectors (RTD) installed in the machine are well suited to monitor temperature changes and trends during normal operation, as long as temperature distribution is uniform, but are blind to some hotspots. Moreover, the relationship between the RTD temperature...
Some exiting generators may have more generation capability than their nameplate rating if they hold large security margin. However, before changing the limit of a generator one must do a thorough evaluation of its behavior in different conditions to extrapolate the effect of any increase. With the help of simulation models to calculate magnetic and stray losses of a machine, it is possible to couple...
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