When the brush of the diesel generator sparks, each brush group of the generator has four parallel brush columns, and each brush column is connected by a brush braid (copper resistance wire). We have to wear insulating gloves because the generator is energized. the rated voltage is 365V, and 180-200V under normal conditions, which exceeds the safety voltage of the human body. Repeatedly pull the brush braid corresponding to the sparks to adjust the brush current distribution evenly to maximize the release of spring pressure and prevent the brush column from sticking and grinding. Also, don't use too much force when pulling to prevent the braids from breaking. By the way, sparks from generator brushes rarely occur. Some comrades have never seen a sparkling broom and don't know how to deal with it. They think the broom handle iszoelectric is sufficient. . The handle is fixed, installed and used to take electric brushes. You cannot push or pull the brushes. If you want to remove the brushes, hold the handle and turn it 90 degrees to the left. Then gently pull on all the brushes and remove them.
Sparking from diesel brushes is severe or several brushes are on fire. Appropriately reduce the reactive power to reduce the excitation current and reduce the working pressure of local faulty brushes. However, it is necessary to prevent the generator excitation regulator from losing excitation in manual mode and there being high excitation in automatic mode. At this time, it is very necessary to warn the generator to reduce the active power (the reactive power will decrease accordingly). It is true that when the generator brush produces serious sparks, the series of measures we takes only serves to save time for maintenance.
The above is the experience brought by Weichai parts manufacturers. I hope this information helps.
Why can water be used to extinguish the fire after the generator catches fire
1 When the oil leak in the oil system causes a fire, a foam extinguisher can be used to do so. put out the fire.
2. When adjusting the When a fire occurs due to oil leakage in the speed system and the safe operation of the unit cannot be extinguished in time, the vacuum should be destroyed for shutdown. 'emergency. . After stopping, the oil pump must be stopped and started manually.
3. In the event of a fire in the oil tank, the vacuum must be destroyed and the engine must be stopped in time. emergency stop, manual start after stopping, open the fuel tank and release the accelerator.
The reWater cooling is a separate circuit that does not directly contact the winding or iron core, but the water flows through the pipe, winding or iron core Achieve a cooling effect outside. The sand is so fine that it would be very difficult to pour and remove, and there is no guarantee that it can be completely removed. It will cause problems in work after extinguishing the fire. If you want to use nitrogen for cooling, it is no different from air cooling, because our atmospheric nitrogen accounts for 78.12% of the total air, which cannot achieve the cooling effect. The cost of using liquid nitrogen is too high.