The situation in which the active power of a hydraulic generator becomes negative is called the process of switching from a generator to an electric device. The hydraulic generator passes output current to an electrical device that inputs current.
Hydraulic generator refers to a generator that uses a hydraulic turbine as the prime mover 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.