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How to Maintain the Oil Temperature of Oil Immersed Transformers?

12 Jan 2024
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GNEE Steel oil immersed distribution transformer

The temperature of the oil-immersed transformer oil has a certain degree. If it exceeds this temperature, it will cause some unnecessary damage to the oil-immersed transformer. The obvious performance is that the oil-immersed transformer body heats up. The oil temperature of the oil-immersed transformer is generally controlled within a reasonable value. If the oil temperature of the oil-immersed transformer is too high, it will directly affect the heating of the engine of the oil-immersed transformer, which in turn will affect the heating of the oil-immersed transformer body. If the heat dissipation is not carried out in time, the oil-immersed transformer may explode.

 

1. Reasons for the rise in oil temperature of oil-immersed transformers

 

The reason for the abnormal rise of the oil temperature of the oil-immersed transformer may be the fault of the overload cooling device of the oil-immersed transformer or the incorrect indication of the internal fault temperature indicating device of the oil-immersed transformer when the cooling device is not fully put into operation. If the oil temperature of the oil-immersed transformer is found to rise abnormally, check the above possible causes one by one, make an accurate judgment, check and deal with it in time: if the operating instrument indicates that the oil-immersed transformer is overloaded, the single-phase oil-immersed transformer group three-phase The indications of each thermometer are basically the same (there may be a few degrees of deviation), and the oil-immersed transformer and cooling device have no signs of failure. If the oil temperature rise is caused by overload, it will be treated as overload. If the cooling device is not fully put into operation or is faulty, it should be dealt with immediately to eliminate the fault.

oil immersed self cooled transformer
oil immersed power transformer

2. Maintain the oil temperature of the oil-immersed transformer

 

If the fault cannot be eliminated immediately, the operating load of the oil-immersed transformer must be reduced, and the operation should be performed according to the corresponding value of the cooling performance and load of the corresponding cooling device. If the remote temperature measurement device sends out a temperature alarm signal, and the indicated temperature value is high, but the on-site thermometer indication is not high, and the oil-immersed transformer has no other faults, it may be a false alarm of the remote temperature measurement circuit fault. be excluded when appropriate. If the oil temperature of a phase in the three-phase oil-immersed transformer group rises, which is significantly higher than the operating oil temperature of the phase under the same load and the same cooling conditions in the past, and the cooling device and thermometer are normal, the overheating may be caused by If there is some kind of fault inside the oil-immersed transformer, professionals should be notified to immediately take oil samples for chromatographic analysis to further identify the fault. If the chromatographic analysis shows that the oil-immersed transformer has an internal fault, or the oil-immersed transformer continues to rise under the condition of constant load and cooling conditions, the oil-immersed transformer should be taken out of operation according to the regulations on site.

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