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Phenomenon When The Transformer Oil Level of Silent Generator Set is Abnormal

Sep. 18, 2021

When the silent generator set transformer is running, the normal oil level must be maintained. The personnel on duty should check the instructions of the oil level gauge on time. When the oil level is too high (such as summer), the oil should be drained in time; when the oil level is too low (such as winter), the oil should be refilled in time to maintain the normal oil level and ensure the safe operation of the transformer.

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The oil level is too high. The oil level of the silent generator set is higher than the highest oil level line due to the increase of oil temperature, and sometimes the oil level is at the top and the oil level cannot be seen. The reason for the excessive oil level is: the abnormal operation of the transformer cooler causes the transformer oil temperature to rise, and the oil expands due to heat, which causes the oil level to rise; the oil level is higher when the transformer is refueled, and once the ambient temperature rises significantly, the oil level is excessive. high. If the oil level is too high due to abnormal operation of the cooler, check whether the surface of the cooler is clogged with dust, whether the upper and lower valves of the oil pipe are open, whether the pipe is blocked, whether the fan and submersible pump are operating normally and reasonably, and the cooling medium Whether the temperature is appropriate and whether the flow rate is sufficient. If the oil level is too high due to excessive refueling, the oil should be drained to an appropriate height. If the oil level is not visible, it should be judged that the oil level is indeed higher than the highest oil level line, and then drain the oil to an appropriate height.

The oil level is too low. When the oil level of the transformer of the silent generator set is significantly lower than the oil level corresponding to the current oil temperature, and the oil level is below the lowest oil level line or is not visible, it should be judged that the oil level is too low. The reasons for the low oil level are: oil leakage in the transformer; the original oil level of the transformer is not high, and the oil level is too low when the load of the transformer drops suddenly or the temperature of the external environment drops significantly; the time when the oil of the strong oil-water-cooled transformer flows into the oil cooler Longer will also make the oil level too low. If the oil level is too low, it will cause the light gas protection to operate, and if it is a float relay, it will also cause the heavy gas protection to trip. When there is a serious shortage of oil, the transformer core and windings will be exposed to the air, which will not only be susceptible to moisture and reduce the insulation capacity, but also may cause insulation breakdown. Therefore, if the transformer oil level is too low or the oil level is significantly reduced, oil should be replenished to the normal oil level as soon as possible. If the oil level is significantly reduced due to severe oil leakage, it is forbidden to change the gas protection from trip to signal to eliminate the oil leakage and restore the oil level to normal. If a large amount of oil leaks, the oil level drops below the gas relay or continues to drop, the transformer should be stopped immediately.

Fake oil level. The reasons for the false oil level may be: false oil level will appear when the non-capsule-sealed oil pillow oil standard tube of the low noise generator is blocked, the respirator is blocked, or the air hole of the explosion-proof tube is blocked. When the capsule-sealed oil pillow has a certain amount of air, the capsule is blocked from breathing, the capsule is installed in an unreasonable position, and the capsule bag ruptures, it will also cause a false oil level. When handling, the heavy gas protection should be lifted first.

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