in the oil, which contaminates the oil from an external source such as humidity and free water or internal source where water is produced from the deterioration of cellulose insulation paper. Dissolved water content may affect the electrical properties of the oil and accelerate the chemical deterioration of insulation paper.
This test measured the lowest temperature from oil, corrected to a barometric pressure of 101,3 kPa, at which application of test causes the vapour of a test portion to ignite under specified condition of test. The result of this test can indicate the presence of contaminant.
this test measures the concentration of acidic constituents or contaminants in the oil. In conjunction with other test, the result will determine when the oil should be reclaimed or replaced.
Pour point is the lowest temperature at which oil will continue to flow when its cooled under standardized prescribed condition. After preliminary heating, the sample is cooled at specified rate and examined at intervals of 3 degreeÂ C for flow characteristics.
this test measures the interfacial forces acting between a layer of oil and water. These intermolecular forces are affected by the ageing of the oil. The test result indicates the degree of oxidation and deterioration of oil and possible sludging. These contaminants affect the oil in its ability to perform the functions of cooling, insulating, […]