In general, for the deep color transformer oil, the chemical supervision test of oil should be strengthened to shorten the experimental period, or, to be said, it is not suitable for reuse. The transformer oil should be regenerated to prevent accidents.
After taking a small amount of transformer oil and oil samples from the bottom sampling valve of the transformer, the good transformer oil should be clean and transparent after taking out a small amount of transformer oil and oil samples from the sampling valve at the bottom of the transformer, and there should be no precipitation, mechanical impurities, suspended matter and cotton like substance.
If the oil sample is blackened, the flash point tends to be close to or lower than the international standard requirement in the simplified analysis. The increase of the components of hydrogen and acetylene is also an important feature in chromatographic analysis.
Generally, the oil black can be judged to be the phenomenon of discharge or overheating in the transformer, and the transformer oil is blackened by the carbonization of the solid medium of the transformer. When the discharge is serious, the equipment will be burned and even explode. Too low flash point can cause a transformer to fire or even explode. For oil black and low flash point oil, special attention should be paid to it.
If the oil sample is cloudy and white, it may be caused by moisture in the oil. It can be generally diagnosed as the influent and wetness of the transformer oil. Here is a simple way to know the distribution transformer oil breakdown voltage value is qualified or not, and no need to use oil dielectric strength tester to judge.
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