Causes and Solutions for Diesel Generator Set Tripping

During the operation of diesel generator sets, various faults are inevitable. Only by thoroughly understanding the unit can we respond with ease. Fault causes include issues like the generator not producing electricity, emitting black smoke, unit vibration, excessive noise, or sudden tripping and stoppage. Today, the editor of Dingbo Power will introduce in detail the reasons for diesel generator set tripping and the corresponding solutions.

The following phenomena may cause diesel generator tripping:

1.Diesel generator overheating;

2.Unstable generator voltage being too high or too low;

3.The generator's output power being lower than the load power, resulting in increased current and tripping;

4.Relay leakage, control switch automatic protection causing tripping;

5.Other personnel's misoperation.

To determine the cause of this tripping and then take corresponding measures, the specific steps are as follows:

1.When the main circuit breaker at the outlet of the generator - transformer group trips automatically, first check whether there are obvious fault problems on the generator indicator instruments. If there are, immediately cut off the excitation. If there are no abnormal features, under good boiler conditions, the electrical duty officer should adjust the generator voltage and frequency within the normal range, check whether the high - voltage power used by the unit has tripped, whether the start - up transformer is interlocked and put into operation, and whether the power consumption is normal.

2.According to the accident phenomena and relay protection action situation, judge the nature and scope of the fault, and make a detailed external inspection of the generator - transformer group and related equipment to find out whether there are any external fault signs.

3.If it is caused by bus differential protection action or substation outgoing line fault causing generator over - current protection over - tripping, check that the generator is normal externally, isolate the fault, and then contact the network dispatching for grid connection.

4.If strong excitation action occurred before tripping, there was a current impact, and the main protection (differential, heavy gas, etc.) reflecting internal faults of the generator - transformer group acted while the power grid was operating normally, the unit should be shut down for processing at this time.

5.If there was no strong excitation action before tripping, no impact current, normal power grid operation, normal boiler, normal water - hydrogen - oil system of the generator and main transformer, handle as follows: check the generator and its circuit; calibrate the protection that acted. If the normal generator can be zero - started and boosted. When boosting, if everything is normal, the generator can be connected to the grid, and then continue to find the cause. When boosting, strong excitation and automatic adjustment devices must not be put into operation, the neutral point on the high - voltage side of the generator - transformer group should be grounded, and if any abnormal phenomena are found, stop the machine immediately for inspection.

If it is found that the tripping was not caused by a fault in the diesel generator set, it may be caused by relevant personnel accidentally touching or misoperating. At this time, the extinction switch is often still in the closing position, and the operator should manually trip the extinction switch first, and then immediately reconnect the unit to the grid for operation.

Dingbo Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to [email protected] we will pay highly attention on your question.