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Interfacial Tension (ISO 6295)

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, […]

Density or Relative Density (ISO.3675)

Density is not significant in determining the quality of an oil but may be useful for type identification or to suggest marked compositional changes. In cold climates, density may be pertinent in determining suitability for use, e.g. ice crystal formed from separated water may float on oil of high density and lead to flashover on […]

Breakdown Voltage (IEC 60156/AS 1767.1)

this test measures the suitability of oil to withstand electrical stress. High level of dissolved matter and solid particles in the oil will reduce the breakdown voltage of the oil.

Kinematic Viscosity (ASTM D 445)

Viscosity is a controlling factor in the dissipation of heat. Ageing and oxidation of the oil tend to increase viscosity, but the effect is not discernible at the deterioration levels.

OQIN (Oil Quality Index Number) (WP 222)

these number will shown to us, when we need to replace or reclaime oil of the transformer.