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Engineering
Electrical Engineering
Can we accurately model transformer oil degradation with mathematical equations?
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[QUOTE="Baluncore, post: 6017862, member: 447632"] Transformer oil is usually pure alpha-methyl naphthalene. The oil may be partially burnt by arcs at poor connections, so the oil becomes cloudy with carbon particles. If water is present it forms a hydroxide, a yellow soapy scum that will block filters. Water has a high dielectric constant only when it is a free liquid, there may be no change in dielectric constant between the good oil and hydrated oil, probably hydro-naphthalenes ? The hydrated oil usually floats to the surface rather than forming an emulsion. You will need to identify all the contaminant species that might be present. Transformer oil must be clean to function, so the impurities that must be detected will be in very small concentrations, say below 1 part in 1000. The change in dielectric constant will be very very small. You might do better estimating contamination by measuring the scattering of light with some form of turbidity sensor. There was an old test that plunged a red-hot iron rod into the oil. If it made a cracking noise it was wet and needed replacement. Be aware that some transformer oil is contaminated with PCB carcinogens, those remain from older oil previously used in some equipment. [/QUOTE]
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Can we accurately model transformer oil degradation with mathematical equations?
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