This paper describes the techniques employed for extraction of device param
eters for a 20MVA hydro-turbine generator in the Tennessee Valley Authority
(TVA) power system. Several approaches were implemented in the extraction
of parameters. Measurements on the generator were made prior, and subsequen
t, to extensive rework as part of a generator upgrade project. In addition,
static exciter and overall response tests on the complete system were perf
ormed after the upgrade. The identified generator parameters before and aft
er the upgrade are compared.