| 摘要 |
PURPOSE:To prevent the variation of a motor output due to the sudden change of water volume by controlling the opening of a guide vane at a previously fixed rate after turning on a prarllel braker. CONSTITUTION:When the parallel breaker is connected to a system, the value of a guide vane deviation signal is large and a contact KC is closed to the (b) side, so that the real opening eta of the guide vane 4 is gradually opened. If a rated water level Href is held at the time to when the water level H turns on a parallel breaker, an integrating time constant To decided by the water surface area of an adjusting pond 2 and a signal etaa decided by a water level adjusting ratio R are ''0'', and when the guide vane 4 is opened by an opening bias signal while keeping an inclination, the signal etaa is moved in the negative direction. Since a guide vane opening command signal obtained by adding a guide vane opening bias etaF to the signal etaa coincides with a real guide vane opening eta at a crossing point of time t1, (etaF+etaa-eta), a guide vane deviation signal, is turned to ''0'' and the titled device is turned to automatic water level adjusting operation. |
