Transformer oil is a mineral insulating oil consisting of various kinds of different hydrocarbons. It is divided into 10, 25 and 45 types according to its condensation point. It is widely used in insulation, heat transfer and arc suppression.
Sampling is very important in the whole insulation oil test. The correct sampling method is the premise to obtain representative samples, and the prerequisite to ensure the truth of the results. Sampling is usually divided into routine analysis and sampling, sampling of oil and dissolved gas in transformer oil, and sampling of oil samples. The sampling containers are different.
When the transformer operates normally, the internal insulating oil and organic solid insulating material will gradually decompose and decompose due to the effect of electric field, heat, oxygen and so on. Hydrogen, various low molecular hydrocarbon gases and carbon monoxide, carbon dioxide and so on are produced. These gases are dissolved in oil first and then precipitate from the oil after reaching saturation. When there is a fault in the transformer, it will accelerate the production of these gases, and the gas content in the oil will also increase significantly.
Transformer oil, as an insulation medium in transformer and other power equipment, is directly related to the safety of power equipment. Therefore, the physical and chemical test of transformer oil and chromatographic analysis can ensure the safe operation of transformer and other electrical equipment, and improve the reliability of power supply to the maximum limit.
1000mL Brown grinding bottle is usually used for oil quality analysis. When the moisture and dissolved gas are analyzed, a well sealed syringe should be selected for sampling. The oil sample shall represent the oil of the equipment body, and avoid sampling at the dead corners where the oil circulation is not enough. Generally, sampling valve should be sampled at the bottom of the device, and sampling can be done at different sampling locations under special circumstances.
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