After comparing experimental result and theoretical calculation

some disputable problems such as the time constant of relay

the axial force of pilot valve and the shut-down speed of servo-motor are approached

referring to the evaluation of dynamic characteristics of the governing systems on N125 and N300 steam turbines. Other problems are as well discussed as follows;the simplification of math models in calculating dynamic characteristics; the changes of system structure and disturbing amplitude in using electro accelerator; the variation and deterioration phenomena of dynamic parameters of math models; and the importance of carrying the experimental research of system identification

etc.