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Transformer oil is used in oil-filled transformers, few kinds of HV capacitors, switches, circuit breakers, etc. Crude petroleum is fractional distilled and subsequently treated to obtain this kind of oil. This oils can be paraffin based or naptha based. When this oil is filled in electrical power transformers, it insulates and cools down the system. The best properties of this oil are High dielectric strength, Thermal conductivity and Chemical stability. The large power transformers are cooled down with such oils along with cooling fans. This oil is tested for chemical and physical parameters, like color, appearance, density, resistivity, breakdown voltage, water content, acidity, etc.