The reverse power protection function of a generator is to prevent the power system from sending power back to the generator when the prime mover loses power. When the direction of power changes, the generator transforms into an electric motor, shifting from generating power to absorbing power. In this way, due to the extremely high rotational speed of the prime mover, a reverse torque will be generated on the prime mover after the power transformation here, damaging the prime mover and consuming electricity unnecessarily at the same time.
In principle, diesel generators can operate at reverse power. But in reality, when operating at reverse power, the generator becomes an electric motor. Not only does it consume its own electricity when sending it out, but it also uses electricity from the power grid. Long-term operation at reverse power may cause the winding to burn out. Therefore, under normal circumstances, the generator should not be operated at reverse power for a long time.
At present, two independent reverse power protection devices, namely programmed trip reverse power protection and simple electrical reverse power protection, are generally installed on large generator sets to limit the size of the generator’s reverse power. Generally, the rated power does not exceed about 10% of the rated active power.
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Post time: Nov-14-2025