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.

Most serious failure of power equipment is due to the insulation breakdown. Partial Discharge (PD) phenomenon that damages insulation by gradual erosion is major source of insulation failure. In high voltage engineering studies, partial discharge (PD) is an electrical discharge that is localized in nature and partially joins the insulation present in between the conductors and that may or may not happen next to a conductor. So, partial discharge (PD) phenomenon is an important tool for improving the reliability of HV insulation systems. Accurate simulating of PD is more important for insulation study. In this project, partial discharges mechanism in solid dielectric material will be modeled using Simulink in MATLAB® software. In this work, for the analysis of actual PD activity inside the insulator with respect to the application of high voltage using MATLAB Simulink software an electrical circuit model of a Teflon as an insulator with a cubical void as an impurity is taken.

Partial discharge represents a physical phenomenon. In high voltage (HV) electrical power system, different kinds of solid, liquid and gaseous materials are being used for insulation purpose to protect the incipient failure inside the HV power equipment. Among these the solid insulation is widely used for high voltage power equipments. Partial discharge is nothing but localized electrical discharge that only partially bridges the insulation between conductors and which may or may not occur adjacent to a conductor [3]. It indicates the presence of an imperfection within the insulation. The magnitude of these discharges though small, can cause progressive deterioration and ultimate failure.In this paper, simulation work is done with the solid insulation material, simulation of partial discharge is done using MATLAB with different insulation material.. In this paper, the dependency of partial discharge on the permittivity of the insulation material is tried to be analyzed with the help of cubical void model made in the very well-known software "MATLAB". The simulation process is meant tocreate a better understanding of the characteristic of partial discharge in solid dielectric material. This project is focus on the result of the partial discharges indifferent insulation material.