In high voltage (HV) electrical power system, for the protection of high voltage power equipment to protect incipient failure one require proper insulation. For the insulation solid, liquid and gaseous form materials are used. There is no ideal insulating Material in real life that is flawless, in actually, and contains impurities. The biggest affecting impurities in the insulating materials is the presence of air bubble and deeply undesirable for such type of bad insulation which makes a local weak zone inside the insulator. The High Voltage equipment insulation gradually degrades due to cumulative effect of electrical, chemical and thermal stress inside the insulator. Due to the degradation a high voltage stress creates which causes the weak zone inside the insulator. The partial discharge is the result of cumulative collection of all these phenomena. Finally the insulation properties of these materials is excessively degrades its quality. In this work a simulation model investigation of insulating material transformer oil has been finished. Transformer oil as a liquid insulator are taken for acknowledgement of real Pd action inside the insulators with the use of high voltage utilizing the point-plane electrode arrangement. Electrical equipment model of the insulation has been done using MATLAB SIMULINK with a cylindrical void which is impurity. In addition, the relationship between the induced charge and void parameter is discussed for cylindrical void
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