The insulation condition of a transformer decides the longevity of the equipment. The unpredicted failure of power transformer will lead to major disaster in the distribution network and it affects both environment and public safety. Nowadays synthetic oil and natural esters are alternatives to transformer oil because of the biodegradable nature. In this paper, investigations were carried out to study the performance of the blended ester. The different properties investigated were viscosity, breakdown voltage, flash point, dielectric dissipation factor and moisture content. Comparisons of the properties were made between mineral oil, vegetable oil without additives and with additives. Further Investigation was carried out to study the impact of antioxidants and degasification. The results indicated that the addition of antioxidants and degasification of the vegetable oil improve significantly its voltage withstanding capacity. The Indigenous oil is code named as DM; Indigenous oil with DBPC is codenamed as DM1, Indigenous oil with BHA is codenamed as DM2. The results have been tabulated and found to be satisfactory.
Liquid dielectrics are extensively used in electrical apparatus which are operating in distribution and transmission systems. The function of electrical equipment strongly depends on the conditions of liquid dielectric. Liquid dielectrics are used is the most expensive components in power system apparatus like transformers and circuit breakers. A failure of these equipment would cause a heavy loss to the electrical industry and also utilities. Insulation failures are the leading cause of transformer failures and thus the liquid dielectrics plays a major role in the safe operation of transformers. One of the main cause for the failure of transformers is due to the presence of moisture. In this work, the life of insulating medium is estimated by comparing the Breakdown strength and Viscosity of different pure oils with that of the contaminated oils (which contains moisture) and also finding the alternative for mineral oil i.e. vegetable oils which are reliable, cost-effective and environmentally friendly even when they are contaminated.
Insulators or dielectrics plays an important role in the high voltage power equipment. Various types of insulators are used in high voltage (HV) electrical power systems to protect the power equipments. For the purpose of safety and better efficiency, insulators should be kept in a healthy condition during its operation . As the insulators are not pure due to presence of impurities and cavities inside the insulators, the local electrical breakdown known as partial discharge (PD) takes place due to the High Voltage stresses. It is well evident that most of the insulation failure is caused due to the partial discharge in the insulation material. It gradually degrades the properties of the material which further become the major cause of the failure of the insulation. In this paper, simulation of partial discharge is done using MATLAB for Rubber as insulation material. All the simulation work is done on Rubber which is a solid insulation material. In this study, the dependency of partial discharge on the permittivity of the insulation material is tried to be analyzed with the help of void model made in the very well-known software "MATLAB".
An important tool for improving the reliability of high voltage (HV) insulation systems are partial discharge (PD) measurements. Partial Discharge (PD) that damages insulation by gradual erosion is major source of insulation failure. In electrical engineering, partial discharge (PD) is a localized dielectric breakdown of a small portion of a solid or fluid electrical insulation system under high voltage stress, which does not bridge the space between two conductors. So, an important tool for improving the reliability of HV insulation systems are partial discharge (PD) measurements. Accurate simulating of PD is more important for insulation study. In this paper, the mechanism of PD has been simulated by using MATLAB simulink.
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