Principle of electric braking of hydraulic turbine generator:
Electric braking of hydraulic turbine generator is realized by using the principle of electromagnetic induction to generate electromagnetic force. When the unit speed is between 50% and 60% of the rated speed, the electric brake is activated. At this time, the generator excitation transformer is disconnected and the braking transformer access switch is closed. The braking transformer takes direct current. The AC power and rectification are then re-excited and transmitted to the generator, and then the three-phase output of the generator rotor is short-circuited. At this time, the generator rotor generates a reverse torque opposite to the original direction. of rotation, causing the unit to accelerate to a stop when the unit speed reaches 20% ——When it reaches about 30%, the mechanical brake will be atapplied again and eventually the unit will shut down completely.
Extension of knowledge point:
Hydraulic generator refers to a generator that uses a hydraulic turbine as the main engine to convert water energy into electrical energy. As water flows through the turbine, the energy of the water is converted into mechanical energy. The rotating shaft of the turbine drives the generator rotor, which converts mechanical energy into electrical energy and produces it. It is the main electrical equipment for producing electrical energy in hydroelectric power stations.