Exciter Model: ST8C

Following checks and corrections are applied during Validation and AutoCorrection.

• If 0.0 < Ta < 0.5*Mult*TimeStep then Ta = 0, ElseIf 0.5*Mult*TimeStep < Ta < Mult*TimeStep then Ta = Mult*TimeStep
• If 0.0 < Tr < 0.5*Mult*TimeStep then Tr = 0, ElseIf 0.5*Mult*TimeStep < Tr < Mult*TimeStep then Tr = Mult*TimeStep
• If 0.0 < Tf < 0.5*Mult*TimeStep then Tf = 0, ElseIf 0.5*Mult*TimeStep < Tf < Mult*TimeStep then Tf = Mult*TimeStep
• Kpa and Kia: Kpa can't be 0 if Kia = 0, if true then Kpa changed to 1.
• Kpr and Kir: Kpr can't be 0 if Kir = 0, if true then Kpr changed to 40.
• If Ka = 0 then Ka = Mult*TimeStep
• If Kf = 0 then Kf = Mult*TimeStep
• If Vrmax < Vrmin then swap the values
• If VAmax < VAmin then swap the values
• If VPImax < VPImin then swap the values

Mult represents the user-specified value Minimum time constant size as multiple of time step option on the Validation page of the Transient Stability Dialog

TimeStep represents the integration time step being used as described on TimeStep

Following treatment is handled during the transient numerical simulation

• If Vr > Vrmax, then Vrmax = Vr or if Vr < Vrmin, then Vrmin = Vr
• If Va > Vamax, then Vamax = Va or if Va < Vamin, then Vamin = Va
• If IFDref > VPImax, then VPImax = IFDref or if IFDref < VPImin, then VPImin = IFDref