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Modeling and simulation of power cable insulation

The use of power cables for transmission and distribution of electrical power have increased since the advent of suitable, reliable and economical polymeric insulating material; such as cross-linked polyethylene (XLPE). Power cables plays crucial role in the power systems, hence the failure of power cables leads to tremendous loss in terms of power, time and money. The failure of power cable is due to failure of its insulation. Therefore, the insulation of power cable needs careful and special attention. The study of insulating material, such as XLPE, requires its simple and valid mathematical model. Therefore, the aim of this paper is to develop mathematical model of XLPE insulation of 132 kV power cable. Initially, the construction of XLPE power cable is presented. The most general equivalent circuit of lossy insulation is used to present the model of XLPE insulation. The imperfections in the insulation, such as voids, are modeled by using the most common ABC model. These imperfections are mainly responsible for initiating partial discharge (PD) in power cable insulation. For studying the behavior of XLPE insulation having local defects, such as voids, the ABC model of XLPE insulation is simulated in MATLAB/Simulink. Using this Simulink model of imperfect XLPE insulation, the initiation of PD pulses in 132 kV power cable is presented with input voltage waveform and resulting PD pulses.