SIMULATION & EXPERIMENTAL STUDY OF PARTIAL DISCHARGE IN INSULATING MATERIALS FOR HIGH VOLTAGE POWER EQUIPMENTS

Insulators are the integral part of the high voltage power equipments, several types of insulators are used in high voltage electrical power system to protect the power equipments. For the purpose of safety and better efficiency, it is necessary to keep the insulators in a healthy condition during its operation. As the insulators are always in impure form due to presence of air bubbles (void) /other impurities inside the insulators, the local electrical breakdown is so called partial discharge (PD) takes place due to the high voltage stresses. Due to this, PD occurs and property of insulators deteriorates enormously. Therefore, detection of PD is the one of the important task for electrical engineers to keep the high voltage power equipment in healthy condition. In this paper an experimental and simulation model study of both solid and liquid insulators has been done. Perspex as a solid insulator and oil as a liquid insulator are taken for realization of actual PD activity inside the insulators with the application of high voltages. Electrical equivalent model of the insulators has been developed using MATLAB Simulink environment with a cubical void (air bubble) as an impurity is taken inside the insulator. In this study, the maximum amplitude of PD, partial discharge pulses at different applied voltages, and amplitude of PD breakdown voltages with frequency are studied for the analysis of partial discharge characteristics in the insulating materials.

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