The density of the oil product quality in unit volume of oil that the unit is kg/m (or g/cm fand, fand g/mL).
The density effect of transformer oil thermal conductivity, and can also be used to determine whether the oil used in some special occasions, especially for its work in the cold area in winter period of transformer temporarily disabled does not appear ice is more practical. In cold climates, free moisture in transformer oil will condense into ice, if the oil density is greater than the density of ice, is floating ice in transformer oil on the surface of the ice itself, generally do not have what effect on the transformer insulation.
However, when the oil temperature rises, the ice melts into water and enters the oil field. The region with high electric field intensity will cause the insulation strength to decrease obviously, and then lead to the breakdown of the insulation. Therefore, the density of the oil should not be greater than the density of the ice to avoid the emergence of such a dangerous state. 0 degrees of ice, the density can be varied over a considerable range (0.880-0.920x10 kg/m fand fand).
The provisions in the detection standard of transformer oil in transformer oil density at 20 C not more than 0.895x10 kg/m fand fand. This basically meets the requirement of transformer operation in cold condition. For transformer oil, only the other properties of the oil (such as flash point) are not affected, and the lower density is better.
The density of oil is related to the chemical composition and the content of water, and the oil density of different producing areas and manufacturers is obviously different. In the production practice from the oil density estimated oil properties, containing much oil than alkanes containing naphthenic hydrocarbons and aromatic hydrocarbons of oil density, and sulfur, oxygen and nitrogen compounds and petroleum coke much oil density is big.
At the same time, for transformer oil, to control its density, in a sense, it also controls the content of water in the oil. Oil density is also related to temperature, high oil temperature, volume expansion, density is small, otherwise, the density is large. The provisions of China oil density at 20 C for the standard density to 20 P said detection equipment corresponding to the Shanghai plume YT-1884 petroleum products density instrument factory production apparatus. When the density of the determination is not 20 degrees, the density can be checked by the petroleum density conversion table
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