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Transformer oil is a kind of fractionation product of petroleum. Its main components are alkanes, naphthenic saturates, aromatic unsaturated hydrocarbons and other compounds. Commonly known as square shed oil, light yellow transparent liquid, relative density 0.895.
Main functions
(1) Insulation function: transformer oil has much higher insulation strength than air. The insulating material soaked in oil can not only improve the insulation strength, but also avoid the erosion of moisture.
(2) Heat dissipation: the specific heat of transformer oil is large, and it is often used as coolant. The heat generated during the operation of the transformer makes the oil close to the iron core and winding expand and rise by heating. Through the convection of the oil up and down, the heat is released through the radiator to ensure the normal operation of the transformer.
(3) Arc suppression: on the on load voltage regulating switch of oil circuit breaker and transformer, arc will be generated when the contact is switched. Because the transformer oil has good thermal conductivity and can contact a large number of gases under the action of high temperature of the arc, it can generate a large amount of pressure, thus improving the arc extinguishing performance of the medium and making the arc extinguish quickly.

Technical parameters

Items	I-0ºC	I-10ºC	I-20ºC	I-30ºC	I-40ºC
Appearance	Clear, free from sediment and suspended matter
Pour point /ºC	-12	-28	-33	-46	-55
Flash point(closed)/ºC	142.5	144	143.5	143	144.5
Acidity(KOH)/(mg/g)	0.008	0.005	0.007	0.007	0.007
Density(20ºC)/(kg/m3)	842.1	869	845.1	889	879.1
Kinematic Viscosity (40ºC) / (mm2/s)	6.5	9.4	6.7	9.4	8.1
Interfacial Tension/(mN/m)	42.5	44.9	43.5	45.8	44.5
Breakdown voltage /kV	57	58	58	62	59

Application The products are good to be used as the insulation and heat conduction medium for the electric equipment, such as transformer, transformer and casing, and it's also suitable to be used as insulation and arc extinguishing medium for oil circuit breaker.

Notice
1 Material of the containers used for storage and transportation (storage tanks, rail tankers, tankers, tanks, etc. ), and the pipelines has to meet certain compatibility requirement for the transformer oil.
2 To avoid oil emulsion, transformer oil's containers, including their pipes, must be strictly separated from other containers. Also, they must to be damp-proof or be sealed from exposure to moist air.