Development Process of Electrical Arc Movement on Ice-covered HVDC Outdoor Insulators

This study concentrates on the dynamics of electrical arcs on ice-accreted outdoor insulators under DC voltage, essential for ensuring the reliability of electrical grids in extreme icy conditions. Employing a comprehensive methodology that combines ice accretion experiments, theoretical analysis, and simulation modeling, the research aims to explore the characteristics and attenuation mechanisms of arc formation and development. Key findings include the effective characterization of arc formation, development, and pre-flashover dynamics under DC voltage, particularly noting intensified discharge activities under negative DC voltage. Furthermore, the study establishes a quantitative relationship between arc burning time, leakage current, and arc parameters, identifying distinct contact-type and non-contact-type arc attenuation mechanisms. These insights not only enhance the understanding of flashover mechanisms on iced insulators but also contribute significantly to improving their operational reliability in harsh environments.