type ExcitationPuType = enumeration(NoLoad "1 pu gives nominal air-gap stator voltage at no load", NoLoadSaturated "1 pu gives nominal air-gap stator voltage at no load, accounting for saturation", UserBase "User defined base for the excitation voltage", Nominal "Base for excitation voltage in nominal conditions (PNomAlt, QNom, UNom)", Kundur "Base voltage as per Kundur, Power System Stability and Control");