مقاله انگلیسی تجزیه و تحلیل ویژگی های جریان نشتی مقره های SiR در شرایط آلوده

Abstract
This study investigates the leakage current (LC) characteristics of silicone rubber (SiR) insulators under various pollution conditions. Utilizing both experimental data and theoretical models, the research explores the behavior of leakage currents, the impact of uniform and non-uniform pollution layers, and the factors influencing dry-band formation and flashover risk. The experimental setup involved testing SiR insulators in a controlled fog chamber, with varying pollution levels achieved using NaCl and Kaolin. Measurements of LC at different voltage levels were conducted to analyze the relationship between surface conductivity and leakage current. The study found that higher pollution severity, characterized by increased salt deposit density (SDD) and non-soluble deposit density (NSDD), led to higher surface conductivity and LC magnitudes. Non-uniform pollution conditions resulted in more complex LC patterns and higher risks of dry-band formation. Theoretical models based on circuit theory and finite element method (FEM) simulations provided insights into the electric field distribution and its impact on LC behavior. These models highlighted the critical role of dry-band formation in increasing flashover risk. Practical implications of the findings include the importance of regular cleaning, application of hydrophobic coatings, and real-time monitoring of leakage currents to enhance insulator reliability. Future research directions are suggested to explore the combined effects of multiple environmental stressors, develop advanced diagnostic algorithms, and investigate long-term aging mechanisms. This comprehensive analysis contributes to a better understanding of SiR insulator performance under polluted conditions, providing a foundation for improving maintenance strategies and ensuring the reliability of power transmission and distribution systems.
Keywords: Leakage current, silicone rubber insulators, pollution conditions, dry-band formation, flashover risk, surface conductivity, finite element method, maintenance strategies, power transmission reliability, aging mechanisms.