After-sales review: Solve the problems of oscillation and loss of steps in synchronous generator sets

Jiangsu Haixing Power reviewed the after-sales service information in 2010 and found that some customers failed to detect problems in time when the synchronous generator set oscillated and lost steps, resulting in damage to the unit. Then, Haixing Generator Unit guides you to judge which generator is out of step from the instructions of the meter, thereby solving the problem and ensuring the smooth operation of the unit.

There are generally three steps to deal with accidents. We need to understand the essence of the problem: what are the oscillations and loss of steps in the generator set?
As we all know, when the synchronous generator is operating normally, the rotation speed of the rotor and the synchronous rotation speed of the stator magnetic field are in a synchronous state. However, when the load suddenly changes, due to the inertia of the rotor, the rotor displacement cannot be stabilized at the new value immediately, but it will cause several oscillations around the new stable value. This phenomenon is the oscillation of the synchronous generator. When the speed of the unit that oscillates no longer coincides with the synchronous speed of the stator magnetic field, the generator and the power system will run at the same time. This phenomenon is the loss of step of the synchronous generator.

So, how should we observe the problem of generator set loss? The oscillation or loss of steps can be seen from the indicators of the meter. It is divided into the following steps:
(1) The pointer of the stator ammeter swings violently, and the current may exceed the normal value;
(2) The pointer of the generator voltmeter and other busbar voltmeters swings violently, and often decreases;
(3) The pointer of the active voltmeter swings on the full scale;
(4) The pointer of the rotor ammeter swings near the normal value.
However, in accidents, the meter of each motor running side by side is often swinging, which can be distinguished from the following aspects:
(1) The failure caused by an accident in our factory can always determine which unit may be lost from the operation reason or the location of the fault;
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If a tendency to stabilize occurs, the more the oscillation becomes smaller, there is no need to operate anything. The oscillation will pass after a few oscillations. Just be mentally prepared to deal with the accident.

As long as you take measures to solve the loss of steps, create conditions for the recovery of the same period as soon as possible:
(1) Increase the excitation of the generator;
(2) If a motor fails, its active output can be appropriately reduced;
(3) Processing according to the above method, if it does not enter the synchronous state after 1-2 minutes, the loss of steps can be delisted from the system.