The following phenomena will occur when the generator oscillates offset:
(1) The stator current exceeds the normal value and the ammeter pointer will hit the block violently.
(2) The stator voltmeter pointer will oscillate rapidly.
(3) The active power meter pointer oscillates across the entire dial.
(4) The needle of the rotor ammeter oscillates rapidly near the normal value.
(5) The generator emits a chirping sound, and the change of the chirping sound corresponds to the swing frequency of the instrument pointer.
(6) The instruments of other generators operating in parallel also have corresponding oscillations.
When the generator oscillates out of synchronization, the service personnel should pay attention to ① restore the synchronization by increasing the excitation current ② The machine load should be adjusted by mappropriate manner to help restore synchronization; ③ When the entire plant loses synchronization with the system, all generators in the plant will oscillate in addition to trying to increase the excitation current of each. generator, if synchronization cannot be restored, in order to protect the generator from damage caused by direct current, the power plant should be disconnected from the system after 2 minutes according to regulations