As the transformer runs for a long time, oil filling is unavoidable. At the same time, equipment after maintenance, oil change is also present.
1, electrical equipment insufficient oil, need to add oil, should be preferred to meet the relevant new oil standard, unused transformer oil. It is better to add the same oil base, the same brand and the same type of additive oil. The characteristics of the oil supplement shall be no less than the oil in the equipment. When the new oil added in small amount, such as less than 5%, usually do not have any problem; but if the adding amount of more new oil, do first sludge precipitation test should be fill in the confirmation before oil sludge precipitation, acid value, dielectric loss factor values is not greater than the oil in the equipment, can fill oil.
2, different oil-based oil, in principle, should not be mixed use.
In special circumstances, such as the new oil mixed with different grades, should according to the actual point of mixed oil to decide whether suitable for this region, then the oil blending test, and mixed samples results should not be the worst kind of oil than the individual difference.
The new oil as in the operation of oil mixed with different brands or have used oil, in addition to the prior determination of mixed oil pour point outside, should also be aging test and sludge test, and observe the sludge precipitation, no precipitation can be used, the obtained results should not be mixed samples than the original running oil poor, can decide the mix.
For the imported oil or origin, manufacturer of unknown sources of oil, use can not be mixed with the oil of different grades of operation principle, when must mix, should advance to the mixed oil and mixed oil after aging test, in the case of no sludge precipitation, the quality of mixed oil should not be less than the original operation oil, can be mixed use; if the mix is the new oil, the mixed quality should not be less than one of the worst oil, and according to the actual need to decide whether the pour point can be adapted to the area to use.
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