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Electrical insulation is a kind of lubricating oil, which is usually deeply refinedLubricating oil base oilIt is prepared by adding antioxidant (see Petroleum Product Additives) and is mainly used as the dielectric of electrical equipment.Such oil products include transformer oil, oil switch oil, capacitor oil andCable oil。
Chinese name
Electrical insulation
Properties
Lubricating oil
Made
Adding antioxidant to highly refined lube base oil
performance index
3
Category
4 kinds
introduce
Naphthenic base oil has long been a good raw material for manufacturing electrical oil due to its low pour point, good low-temperature fluidity, good electrical performance, good thermal stability and thermal conductivity.The pour point of electrical appliance oil produced from paraffin base oil is high. In recent years, synthetic oils such as hydrocarbons and alkylbenzene have been synthesized (seeSynthetic grease）It is also used as electrical oil.
Performance: low temperature performance, oxidation stability and medium lossElectrical insulating oilThree main performance indicators of.
① Low temperature performance refers to the fluidity necessary for oil to automatically convection in electrical equipment, derive heat and instantly cut off arc current under low temperature conditions.Generally, it is required that the electrical insulating oil has low pour point and low viscosity at low temperature.International Electrotechnical AssociationThe transformer oil is divided into three grades according to the pour point (the temperature at which the petroleum products are cooled in the standard pipe to lose their fluidity): - 30 ℃, - 45 ℃ and - 60 ℃.The pour point of capacitor oil and cable oil is generally within the range of - 30~- 50 ℃.
② Oxidation stability: in electrical equipment, oil is subject to heat and oxygen under electric field for a long timeoxidation。In the past, naphthenic base oil was used to produce oil with better oxidation stability under reasonable refining conditions, but the experiment proved that antioxidant andMetal passivatorIts oxidation stability is better.
③ Medium loss: it reflects the degree of medium loss of oil products under AC electric field. GenerallyDielectric loss angle(δ) The tangent value (tg δ) of.Tg δ is a very sensitive indicator, reflecting the degree of refining, purification and oxidative deterioration of the oil. The tg δ value will increase if the oil contains gum, polycyclic aromatic hydrocarbons, or mixed with water, impurities, oil oxidation products, etc.In general, the dielectric loss of transformer oil measured at 90 ℃ shall be less than 0.5%.
Classification: This type of oil includes transformer oil, oil switch oil, capacitor oil and cable oil. ①Transformer oil is a kind of low viscosity oil, which is used for cooling and insulation in transformer and other equipment. ②Oil switch oil is an insulating oil used for oil immersed switches, which was replaced by transformer oil in the past. ③Capacitor oil is used for insulation impregnation or moisture insulation in capacitors (mainly power capacitors or electrostatic capacitors). ④Cable oil is refined lubricating oil used for insulation, impregnation and cooling in cables, or lubricating oil and other thickening agents (such as soft wax, resinpolymerOr asphalt).
