![]() These studies deal mainly with the physicochemical properties of natural esters as ecological and low-flammable esters. In order to find an alternative insulating liquid to the mineral oil used for the insulation and cooling of transformers, many studies have been carried out by several university research centers and by the manufacturers and users of power transformers. ![]() Despite the previously cited advantages, the disadvantages of naphthenic mineral oil, such as its high fire risk and low biodegradability potential in addition to its scarcity in the future because the oil resources will run out, have made it necessary to look for another ecological insulating liquid which has a high solubility in water and an excellent biodegradability. Naphthenic mineral oil has long been the most preferred insulating liquid for power transformer insulation because it has a good pouring point at low temperatures, good thermal cooling capacity, low cost, high efficiency and availability on the transformers market. The obtained results of testing new as well as aged oil samples concerning the resistivity, the dissipation factor tgδ, the conductivity, the viscosity, the breakdown voltage, the increase of the water content and the flexibility of the oil to the movement in an electrical field, show that a half mixture of naphthenic oil and olive oil could be a potential liquid for the insulation of electrical devices and especially power transformers mounted in areas which have a non-cold climate.įor decades and precisely with the beginning of energy evolution, insulating liquids have been used for the insulation and cooling of electrical devices such as transformers, cables, switches and capacitors. All tests have been realized in accordance with the standard test procedures: IEC 60156, IEC 60245 and IEC 61125. In order to determine mainly the breakdown voltage and the electrical field intensity of electro-convection, oils insulating should be mixed in precise amounts. This work presents an experimental study to compare between the physicochemical characteristics of mineral oil, olive oil, sunflower oil and different oil mixtures. However, their low fire safety and low biodegradability potential have made it necessary to look for other insulating liquids as an alternative to this mineral oil used in high voltage electrical equipment. Because of their availability and low cost, mineral oils have been widely used for a long time in power transformers to allow their insulation and cooling.
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