Exciter Model: ESST5B and ST5B

Following checks and corrections are applied during Validation and AutoCorrection.

• 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 < Tb1 < 0.5*Mult*TimeStep then Tb1 = 0, ElseIf 0.5*Mult*TimeStep < Tb1 < Mult*TimeStep then Tb1 = Mult*TimeStep
• If 0.0 < Tb2 < 0.5*Mult*TimeStep then Tb2 = 0, ElseIf 0.5*Mult*TimeStep < Tb2 < Mult*TimeStep then Tb2 = Mult*TimeStep
• If 0.0 < Tob1 < 0.5*Mult*TimeStep then Tob1 = 0, ElseIf 0.5*Mult*TimeStep < Tob1 < Mult*TimeStep then Tob1 = Mult*TimeStep
• If 0.0 < Tob2 < 0.5*Mult*TimeStep then Tob2 = 0, ElseIf 0.5*Mult*TimeStep < Tob2 < Mult*TimeStep then Tob2 = Mult*TimeStep
• If 0.0 < Tub2 < 0.5*Mult*TimeStep then Tob2 = 0, ElseIf 0.5*Mult*TimeStep < Tub2 < Mult*TimeStep then Tub2 = Mult*TimeStep
• If 0.0 < Tub1 < 0.5*Mult*TimeStep then Tub1 = 0, ElseIf 0.5*Mult*TimeStep < Tub1 < Mult*TimeStep then Tub1 = Mult*TimeStep
• T1: If Mult*TimeStep > 4 then T1 = 0.25*Mult*TimeStep, else 1 < T1 < Mult*TimeStep
• If Vrmax < Vrmin 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