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details Electrical insulation oil has excellent insulation properties for electrical equipment，The breakdown field strength is high and the dielectric loss factor is small，Reasonable avoidance of DC charging and discharging conditions and output power damage;Good gas extraction resistance，Reasonably avoid magnetic density charge and discharge，Ensure harmless operation;The melting sludge is strong，Ensure that the sludge generated during the whole operation of electrical equipment is melted，Prevent damage to insulating raw materials and harm to heat conduction，Increase the operating time of the transformer;Lower viscosity，Show reasonable refrigeration and heat transfer and ultra-low temperature start-up;Does not cause sulfur etch to the transformer;Green energy saving，No PAHs。
Ultra-low temperature performance, air oxidation stability and material damage are the three key performance indexes of electrical insulation oil。
① Ultra-low temperature performance means that under the ultra-low temperature standard, the oil can be fully automatic heat convection in the electrical machinery and equipment, exported to generate heat and disconnect the current flow in an instant。It is generally stipulated that the viscosity of electrical insulation oil is small when the pour point is low and ultra-low temperature。The domestic and foreign electrical Research Institute divides the transformer oil into three levels of -30 ° C, -45 ° C and -60 ° C according to the pour point (refers to the temperature when the oil commodity is refrigerated in the standard tube until the loss of liquidity)。The pour point of power capacitor oil and cable oil is generally in the range of -30 ~ -50 ° C。
In electrical machinery and equipment, the oil is subjected to the action of heat and oxygen under the action of electrostatic field for a long time and the air is oxidized。In the past, naphthenic oil was used to produce oil with good air oxidation stability under the useful production standard, but the experiment proved that the oil with antioxidant and metal passivating agent had stronger air oxidation stability。
(3) Material damage is the level of dielectric loss of the oil product under the AC current field, which is generally indicated by the tangent value (tgδ) of the dielectric loss Angle (δ)。tgδ is a very clever index value, reflecting the production level of the oil, the calm level and the level of air oxidation mold, the oil with collagen fiber, benzene series, or mixed with water, residue, oil air oxidation reactants will expand the tgδ value。In general, the material damage measured by the transformer oil at 90 ° C should be less than 0.5%。
This type of oil includes transformer oil, oil power switch oil, power capacitor oil and cable oil。① Transformer oil is a kind of high-viscosity oil, used in transformers and other machinery and equipment, plays the role of refrigeration and insulation。② Oil power switch oil is a kind of insulation oil used for oil immersed power switch, which used to be replaced by transformer oil。(3) Power capacitor oil is used in power capacitors (mainly low-voltage capacitors or electrostatic induction power capacitors) to play the role of insulation prepreg or moisture insulation oil。④ Cable oil is a professional lubricant used for insulation, prepreg and refrigeration in cable lines, or a compound of lubricating oil and other viscosifying agents (such as soft wax, epoxy resin, high polymer or leaching, etc.)。
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