Why Does The Diesel Generator Trip?

During the operation of diesel generators, tripping may occur. So why is there such a problem? What else should we do?

1. When the main circuit breaker at the outlet of the diesel generator-transformer unit automatically trips, first check whether the generator indicating device has an obvious failure symbol, and sometimes the excitation should be cut off immediately. If there is no abnormal symbol, the machine and furnace are in good condition. , The personnel on duty should adjust the generator voltage and frequency within the normal range, check whether the high-voltage power supply of the unit is tripped, and whether the starting transformer is connected to each other. Whether the power supply is normal.

2. According to the accident phenomenon and relay protection action, judge the nature and scope of the fault, and conduct a detailed external inspection of the generator transformer unit and related equipment to determine whether there are external fault characteristics.

3. If the busbar differential causes generator overcurrent protection, or the substation fault causes generator overcurrent protection, check that the generator is normal outside, and after the fault is isolated, contact the network to adjust and connect to the grid.

4. Before the trip, if there is a strong excitation, there is a current surge, which reflects the main protection (differential, heavy gas, etc.) of the internal fault of the generator-transformer unit. The grid is operating normally, and it should be dealt with at this time.

5. If there is no strong excitation, there is no inrush current before the trip, the grid is operating normally, the engine and the furnace are normal, the water and hydrogen oil systems of the generator and the main transformer are normal, such as checking the generator and its circuit; checking the action protection, such as all Normal generators can start at zero voltage. If everything is normal during the boost process, the generator can be connected to the grid, and then continue to find out the cause. When the voltage rises, strong excitation and automatic adjustment devices must not be put into use, and the neutral point of the high-voltage side of the generator-transformer unit should be grounded. If an abnormal phenomenon occurs, the generator-transformer unit should be stopped immediately for inspection.