Transformer insulating oil dielectric strength is high, mainly for use in electrical equipment, and therefore heat capacity is large, so it is used as cooling medium, in circuit breaker and load switch and starting compensator for the cooling effect of arc extinguishing medium and contact.
The electric strength of the pure transformer oil is 200 250kV/cm, 4-7 times higher than that of the air. Therefore, the use of transformer oil as insulation can greatly reduce the volume of the transformer. The paper and paperboard material is very rich, the price is cheaper, the mechanical strength is good, oil immersed transformers after high electrical strength, when the transformer oil breakdown after insulation can be restored, will not leave the discharge channel permanent, so the transformer oil has been widely used.
In high voltage cables, the transformer oil plays the role of filling and impregnating to remove the gas inside the cable and improve the electrical strength. In oil immersed capacitor, oil filling, impregnation, insulation, in order to improve the capacitance and dielectric strength.
The intensity of arc extinguishing mainly depends on the mixture of oil and gas produced by the decomposition of oil and gas. This oil pressure reduction will not significantly reduce its arc extinguishing capability, so the oil requirements of the oil - less circuit breaker can be lower than the requirements of the oil used in the transformer.
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