• Pooja
• Ruchitha K N
• Sneha Thomas
• Spoorthi C B
• Mrs. Sunitha N S

Among the new insulating materials widely used in high voltage outdoor insulation systems, silicon rubber materials also called polymeric materials are very important; during the last 20 years, they have been applied for manufacturing outdoor insulators. These materials are organic; therefore, they are prone to decomposition under different environmental conditions. Polymeric insulators exhibit good performance under polluted conditions due to the unique property of hydrophobicity. However, pollutants in combination with moisture cause the formation of wet conducting films and thus allow the flow of leakage currents. The appearance of dry bands causes arcs on the insulator surface. Such arcs elongate and bridge the electrodes resulting in flashover. In this regard, it is to be understood that whether hydrophobicity transfer occurs on a polluted polymer insulator for different pollution severity. In this paper, the electric field distribution of 33kV polymeric insulators has been carried out for various pollution severities using Solid works. The electric field and potential distribution have been investigated for non-uniform and uniform deposition of the pollution layer. The simulations show that the voltage distribution is uniformly distributed and gradually decreases from the high voltage end to the low voltage end for a non-polluted insulator and the contaminated insulator, the voltage distribution is different, a large portion of voltage is shared by the sheds on the high voltage side; the voltage is also high and magnitude towards the low voltage end of the insulator. To understand the correlation between insulator condition and its leakage current phenomenon, various equivalent circuits representing insulator under different conditions has been investigated. This paper presents the proposed equivalent circuit models of two main conditions of an insulator, i.e. clean, and polluted. In general, the model consists of a capacitor(s) and a nonlinear resistor(s). By using the models, the leakage current simulations have been done using MATLAB SIMULINK software package. The simulations show that leakage current increases for polluted insulators compared to clean insulators.

Polymer Insulator, pollution severity, equivalent circuit, leakage current, MATLAB SIMULINK, SOLID WORKS

"Study on Leakage current characteristics and Numerical Analysis of Pollution layer on Polymer Insulator", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 10, page no.36-42, October-2020, Available :http://www.jetir.org/papers/JETIREH06007.pdf

"Study on Leakage current characteristics and Numerical Analysis of Pollution layer on Polymer Insulator", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 10, page no. pp36-42, October-2020, Available at : http://www.jetir.org/papers/JETIREH06007.pdf