With the rapid growth of electrical energy consumption over the years, has led to the development of many high-voltage transmission and distribution system. But as in case with almost all equipment, continuous use of the instrument inevitably leads to the failure of insulation. So, as is clear, it becomes quite important to periodically assess the insulation's condition. One of the many techniques used to assess the lifespan of insulation is partial discharge (PD) measurement. Some forms of impurities such as air bubbles always present during the manufacturing process. The presence of these impurities weakens the insulation and is responsible for the occurrence of partial discharge. In this paper, solid insulation with void is modeled in Matlab Simulink and the calibrator circuit is modeled in orcad pspice circuit and results are obtained for variation of charge with voltage, No. of counts vs voltage and max. PD magnitude with an increase of voltage is plotted

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