When the freezing point of transformer oil is not higher than -10 degrees (90 years for revision of pour point -7 C), 10# is the transformer oil; when the freezing point is not higher than -25 degrees (90 years for revision of pour point -22 C), 25# is the transformer oil; when the freezing point is not higher than -45 DEG C, 45# transformer oil.
When using the intermediate base or paraffin based raw materials by MEK dewaxing solvent refining clay finishing, freezing point below -25 DEG C, as 25# transformer oil; when using naphthenic oil as raw material of transformer oil, requires no ketone benzene dewaxing can be directly obtained by distillation is lower than the freezing point of transformer oil the raw materials of -45 DEG C.
(1) 绝缘作用 变压器油具有比空气高得多的绝缘强度。绝缘材料浸在油中，不仅可提高绝缘强度，而且还可免受潮气的侵蚀。
(1) insulation transformer oil has much higher insulation strength than air. The insulating material is soaked in oil, not only to improve the insulation strength, but also to avoid the erosion of moisture.
(2) 散热作用 变压器油的比热大，常用作冷却剂。变压器运行时产生的热量使靠近铁芯和绕组的油受热膨胀上升，通过油的上下对流，热量通过散热器散出，保证变压器正常运行。
(2) the heat dissipation transformer oil has a large specific heat, which is often used as a coolant. During the operation of the transformer so that the heat generated near the core and winding up by the thermal expansion of the oil, oil on the convection heat radiator through the shed, to ensure the normal operation of the transformer.
(3) 消弧作用 在油断路器和变压器的有载调压开关上，触头切换时会产生电弧。由于变压器油导热性能好，且在电弧的高温作用下能分触了大量气体，产生较大压力，从而提高了介质的灭弧性能，使电弧很快熄灭。
(3) arc suppression is produced when the arc is switched on the voltage switch of the oil circuit breaker and the transformer. Due to the good thermal conductivity of transformer oil and the high temperature of the arc, a large amount of gas can be touched and a large pressure is generated, which improves the arc extinguishing performance of the medium and extinguishes the electric arc quickly.
(4) the degree of oxidation is not too high. The degree of oxidation usually expressed in acid value, it refers to the amount of absorption of potassium hydroxide free acid 1 grams oil required (mg).
(5) the degree of stability should not be too low, stability usually test sediment acid value, which represents the ability of anti ageing oil.
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