Study on the Breakdown Characteristics of Multiple-Reignition Secondary Arcs on EHV/UHV Transmission Lines

A long-gap ac arc with a length of more than 10 m (secondary arc) is normally generated at the short-circuit channel after single-phase-to-ground fault. In previous studies, breakdowns secondary arcs have mainly been considered as electrical breakdowns, ignoring role heat in channel. Besides, extinction-reignition theory arc, i.e., dielectric strength recovery theory, still lacks support experimental data. this study, based on equivalent experiments performed laboratory, influences compensation degree transmission lines, initial voltage gradient air gap, test current, wind speed, and direction breakdown characteristics are studied statistically analyzed. The laws transient (TRV) rate rise (RRRV) also by considering influencing factors mentioned above. results study will provide complete basis for extinction–reignition deeper understanding breakdown.