On-load tests to measure operating parameters of apparatus in typical thermal and hydraulic power stations were performed. The results obtained by static characteristic tests of a generator were greatly affected by magnetic saturation. Authors propose a new method to estimate on-load synchronous reactances from no-load factory tests. For dynamic characteristic test, authors conducted a new arbitrary-axis load rejection method in addition to d-axis and q-axis load rejection method proposed by F. P. deMello. The frequency response and step response methods were used for measuring parameters of control systems. Comparison of actual phenomena and simulations was made to prove the appropriateness of measured parameters and the results showed considerable coincidences.