With a glass from the bottom of the transformer in a sampling valve remove a small amount of transformer oil samples after the sun, careful observation, good transformer oil should be clean and transparent, no precipitation, mechanical impurity, suspended matter and cotton wool material.
Transformer oil will be deteriorated by the environmental pollution and the resin and sediment produced by oxidation during operation, or it will lead to the change of outer shape when the transformer fails. It is the most basic and most intuitive method to judge the operation status of transformer oil and transformer by using the external oil.
First, if the oil sample is brown or brown, its acid value and water soluble acid tend to be close to or exceed the international standard, but its chromatographic analysis is not certain. Generally speaking, for the transformer oil with deep color, we should strengthen the chemical supervision test of the oil, shorten the experimental period, or we can say that it is not suitable for reuse. The transformer oil should be regenerated to prevent the accident. In general, the color dark, may be aging oil, no fault of power transformers.
In general, black color can be judged as possible transformer internal discharge phenomenon or discharge and overheating, transformer oil for transformer carbonization of solid medium and black, discharge can cause severe burning equipment, and even explosion.
A low flash point can also cause a transformer to fire, or even explode. The color black, and low flash point oil should be special attention.
In general, if the oil samples are cloudy and white, it is likely to be caused by water in the oil, and can be roughly diagnosed as moisture in the internal water of the transformer oil. Here is a simple method to determine whether the breakdown voltage of the distribution transformer oil is qualified or not, and it is not necessary to judge the dielectric strength tester of oil.
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