The sensor has helped us to observe the possible variations of the dielectric constant, the vegetable oil in this case, increasing its temperature and, therefore, stimulating a process of frying and re-using the oil … Even though there are other available methods for degrading vegetable oils using thermal degradation techniques like spectrophotometric methods, but the oil involves various modifications, thus causing lack of accuracy/specificity. of 13 saturated acids, 11 unsaturated acids, five aldehydo acids, two hydroxy acids, two keto acids, and five The chemical properties of the oil may change and its performance could be affected by the presence of ageing-by-products such as moisture and acids. However, the potential of vegetable oils as high voltage insulation liquids has yet to be fully realized. This article discusses some of these characteristics and the relationships between these characteristics and the production and in-service performance of mineral transformer oil. The ANOVA and the Tukey’s post hoc analyses indicated that time, mole ratio and temperature effects were significant for the transesterification process; while time, molar ratio of H2O2 and temperature effects were significant for the epoxidation process. specific to the paper and cannot be produced by general oxidation of the It is anticipated that most of the un-aged oil could satisfy the minimum requirement for dielectric insulation liquids in transformer. 0000003570 00000 n Physical properties like relative viscosity, refractive index and electric dipole moment of oil solution were used to estimate; apparent molecular relaxation time, polarization of oil solution using Wyman's analyses. The two vegetable oils have nearly the same dielectric constant which is relatively higher than that found in the Power transformer is a vital element in a power system as it continuously regulates power flow, maintaining good voltage regulation. The Kraft/cotton paper degraded at a significantly slower rate in natural ester than in mineral oil. Then the oils were impregnated with the Kraft paper and continue to age for selected duration time. When the sensor has a sufficiently low noise floor, HV is recommended because it provides the strongest slick-sea contrast. In recent years, the microwave assisted organic reaction technique has emerged as a new tool and has enabled chemists to achieve cleaner and more efficient chemical reactions with higher yields compared to conventional heating methods. oil, macauba’s almond oil, passion oil, paraffinic mineral oil, naphthenic oil (NH-140) and synthetic oil (Etro) was performed in inert and oxidative atmosphere to study the thermal and oxidative degradation of the vegetable oils related to the most common lubricants’ oils base. In addition, the impact of repeated heating of the oils to the smoke point is also studied, which demonstrates changes in the dielectric properties with smoking, for all the oils under consideration. dicarboxylic acids. Sealed ageing experiments were set at 90°C for 30 days, 90 days and 180 days. aging time. Furthermore, from the data obtained for the other oils, it should be safe to assume that this oil is representative of dielectric properties of the entire group. The dielectric relaxation and thermo physical properties of triglycerides present in some vegetable oils have been measured over the frequency range of 10 MHz to 7 GHz in the temperature region 25 to 10 °C using a time-domain reflectometry approach. Sealed steel aging vessels containing copper, aluminum, dried thermally upgraded Kraft paper, and dielectric fluid (transformer oil or natural ester) were aged at 160 and 170°C for 250, 500, 750, 1000, 1500, and 3000 hours. These advantages are particularly significant from kinetics and thermodynamics perspectives. Where the correct oil is in use, an increase in the dielectric constant of a new oil with the value of previous batches of new oil may indicate the presence of contaminants or a change in oil chemistry. The high flash point (260 °C) and fire point (345 °C) values of MESSO provide operational safety to the transformers when they are filled with the developed insulating fluid.

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