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There is a tendency for excitation control system to upgrade to the digital-based type, with the functions and benefits discussed in (September 1997). New computer models had been developed for representation of the renewal digital-based excitation system in transient stability studies after IEEE Std 421.5  adoption. This paper provides a guide line for replacement of the excitation control system from analog-based to digital-based. These techniques had been used on large steam generator excitation systems of a nuclear power plant in Taiwan. An optimal set of excitation system settings plays a very important role in power system stability. This paper will address the parameters setting and field tuning method for a self-excited exciter rewired to be separated-excited with station auxiliary power. The performance indices were also checked and compared with IEEE Std 421.2.