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The appearance of oil may show cloudiness or sediments which may indicate the presence of free water, insoluble sludge, carbon
The breakdown voltage is of importance as a measure of the suitability of an oil to withstand electric stress.
Water may originate from the atmosphere or be produced by the deterioration of the insulating materials.
The neutralization value of oil is a measure of the acidic constituents or contaminants in the oil. Its value, negligible in an unused oil,
This test distinguishes between sediment and total sludge that is oil insoluble sludge plus sludge which is precipitated by
These characteristics are very sensitive to the presence in the oil of soluble polar contaminants, ageing products or colloids.
The interfacial tension between oil and water provides a means of detecting soluble polar contaminants and products of deterioration.
A low flash point is an indication of the presence of volatile combustible products in the oil. Prolonged exposure of the oil
Pour point is a measure of the ability of the oil to flow at low temperature. There is no evidence to suggest that the property
Density is not significant in determining the quality of oil but may be useful for type identification or to suggest marked
Viscosity is a controlling factor in the dissipation of heat. Ageing and oxidation of the oil tend to increase viscosity but the effect
Mineral insulating oils are made of a blend of different hydrocarbon molecules containing CH3, CH2 and CH chemical groups linked
Furan is a chemical family. Atleast five types of furan are produced due to ageing of paper and they get dissolved in oil.
The degree of polymerization test is conducted on cellulosic paper insulation. The average number of monomer
Particles in insulating oil can have a detrimental effect on the dielectric properties of the fluid, depending on the size…