Improvement for reverse power trip of power plant;

When a small system is in on-load operation in the early stage of black start,unit paralleling may fail due to reverse power protection.

Aiming at a recent mis-energization accident of a generator set in China,a thorough analysis is madeof the relevant protection of generator mis-energization,reverse power,losing excitation,overload of stator winding and overvoltage ofrotor.

Reason analysis and its countermeasure of generator reverse power protection malfunction caused by the secondary circuit anomaly of voltage transformer;