| 摘要 |
<p>PURPOSE:To improve a stability of operation by a method wherein when an electric power system is stabilized in case of an occurance of troubles, an intercept valve is fully closed at a high speed, and in turn a steam adjuster valve is closed to the desired degree of opening, thereafter controlled in reference to the desired load value varied in response to the degree of opening of the valve. CONSTITUTION:When a trouble occurs in an electric power system and high speed valve control (EVA) operating signal is produced, EVA starting instruction contact points 18 and 27 are turned on, and an intercept valve 5 is fully closed at a high speed through a servo valve 16. The steam adjuster valve 2 is closed through a servo valve 25 up to the desired degree of opening alpha of the unit 28 for setting the degree of opening of the steam valve at a relative slow rate of variation set by the steam adjuster valve closing speed setting unit 29. Upon generation of EVA, a difference between an output from an automatic load setting unit 33 through a change-over unit 34 and an actual load 35 is produced as a load setting signal 21 through an integrator 36. Then the signal 21 is compared with a correction value signal 20 of the degree of opening of the steam adjuster valve and then the difference signal is fed out at the servo valve 25 as a degree of opening instruction signal 22.</p> |
