Generator Rotor Temperature calculation can be find by empiric formula from http://control.com/thread/1415075379
Tx = [(Vx^2)/(Vx*Ix*Ro)]*(Kcu+T0)-Kcu
Where
Tx = Generator Rotor Temperature
Vx = Field Voltage Excitation
Ix = Filed Current Excitation
Ro = No Load Resistance (but I took these value at 75 deg C as Toshiba Generator Specification data) = 0.0914 ohm
Kcu = Material constant, 234.5 for copper
To = No Load Temperature (but I took 75 deg C as Toshiba Generator Specification data)
The Generator Rotor Temperature calculation as Average Rotor Temperature is quite same with DCS value.
As a picture below show that at 6:00 to 8:00 the line increase linear, so we can predict how much current and voltage field excitation if the 105C rotor temperature is max limit.
As a picture below show that current and voltage field excitation are quite high at rotor temperature 105C.
Another reference
Kcu = 235 for copper
To = 20 deg C
Ro = 0.0743 ohm
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