Emergency gates - model scale tests at turbine runaway condition

Emergency gates are the last link in chain of safety turbo-groups case distributor failure, safeguarding power station from severe damage. These can be located at turbine intake or outlet draft tube and controlled by gantry cranes hoist hydraulic cylinders. Gates must descend with high flow for a short time to prevent spinning runaway velocity periods longer than admissible, as that would entail rise uplift downpull forces may jeopardize their stability. Indeed, prototype scale, closing maneuver entails certain risk, because which it is usually tested avoiding extreme conditions.