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A wind farm "generator overspeed" shut down, and then triggered multiple faults such as "generator bearing 1 temperature is too high". After accident investigation, the root cause was improper grease filling and too much grease in the front bearing of the generator. Check it out below:
As far as this accident is concerned, when the bearing cage is damaged, the friction between the inner and outer rings of the generator bearing and between the inner ring of the bearing and the generator shaft will cause violent heat generation. The bearing and the front end of the generator shaft will heat up seriously. Evaporation occurs when heated. When the evaporated grease is sprayed from the front end of the generator bearing, it will burn if the temperature exceeds the ignition point of the grease. The rolling elements of the bearing and the raceways of the inner and outer rings of the bearing are seriously blackened, and there is a melting phenomenon between the inner ring of the bearing and the generator shaft (the material is steel, the melting point of pure iron is 1535 ℃, and the melting point of steel is about 1515 ℃. As the content of carbon or other components in the iron increases, the melting temperature will decrease. For example, the temperature of the bearing inner ring and the front end of the generator shaft will be It is very high, which can cause a large amount of base oil to quickly vaporize. After a large amount of combustible gas is sprayed from the front bearing end cover of the generator, it is ignited at the front end of the generator shaft or at the torque limiter, causing ignition and combustion.
When the generator set has been used for a certain number of years, it is inevitable that the generator bearing will be damaged and stuck. The previous analysis shows that if there is no large amount of grease inside the front bearing of the generator, it will not cause the spread of fire and cause a fire.
Therefore, in order to avoid the recurrence of such accidents, effective measures should be taken to strictly control the amount of grease inside the bearing to prevent a large amount of grease from depositing in the generator bearing. More accurate control of the amount of oil injected into the front bearing of the generator is the fundamental method to avoid fire accidents.
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