Protection of units with adjustable-blade turbines from racing

Abstract

Uplifting of rotating parts is sometimes observed on units with adjustable-blade turbines in transitional regimes. This can occur not only on dumping the load but also in normal operating regimes, e.g., upon fast closing of the guide vanes without disconnecting the hydroelectric generator from the power line.As the investigations performed by the V. V. Kuibyshev Moscow Civil Engineering Institute showed, uplifting of the rotating parts of the unit occurs in the case of a certain combination of the rotor speed, opening of the guide vanes, and runner-blade angle, when the turbine runner is operating in a pump regime.