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Appearance
Color of oil in service indicate deterioration stage, Cloudiness indicates the pressence of dissolved water & suspended particle of sediments indicates the products of oxidation.
Kinematic Viscosity
Influences heart transfer characteristics of oil.
Interfacial Tension (IFT)
Indicates the presence of deterioration products of oil oxidation (Sludge) & excessive polar contaminants.
Flash Point
Indicates the presence of lower hydrocarbon (i.e Highly Volatile & Flammable materials) in oil.
Neutralization Value (Total Acidity)
Indicates the acid content in the oil which increases corrosion of metal in the equipment & decreases Dielectric properties.
Sludge & Sediments
Indicates the deposition of sticky sludge & fibrous particle contamination which enhances the restriction in hit transfer & decreases insulation resistance of windings.
Electric Strength (or Breakdown Voltage)
Indicates the presence of free water, dirt, conducting particles & moist cellulosic fibers.
Water Content (or Moisture Content)
Indicates the total dissolved water in the oil which decreases the insulation value resistance of windings.
Specific Resistance (resistivity)
Indicates the absence of Conducting impurities & free-ion content in the oil which maintains a high insulation resistance of windings.
Dielectric Dissipation Factor (Or Tan Delta)
Indicates the presence of soluble varnish, polar contaminants & product of deterioration in the oil.
Dissolved Gas Analysis (D.G.A)
1) Hydrogen 2) Carbon Monoxide & Dioxide 3) Hydrocarbons 4) Total Combustible Gas Contents Monitors the internal condition of the transformer. Also reveals the presence of incipients fault in the transformer & also gives a fair indication of the severity of the such fault.
Furan Analysis (for furan content)
Periodical evaluation of furan compound in the oil help to know the condition of soil insulation.
PCB Anaylysis
Indicates the presence of polychlorinated biphenyl compounds in the oil which is banned by the pollution control board.
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