Simulation and experimental study reveals raindrop bridging and electric field distortion in high-speed train insulators, indicating wider shed spacing mitigates flashover risks.
Key Points
Investigate how airflow-induced raindrop dynamics and shed geometries alter electric field distortion and flashover susceptibility in high-speed train insulators.
Recorded dynamic raindrop behaviors, including stretching and bridging along shed eaves during flashover development, using high-speed cameras.
Conducted finite element simulations to analyze how shed structures influence airflow patterns, raindrop trajectories, and electric field distributions.
Airflow-induced raindrop stretching, fragmentation, recombination, and bridging accelerated conductive path formation, directly governing arc generation, drift, and extinction.
Insulator designs with wider shed skirts and larger inter-shed spacing effectively suppressed raindrop accumulation and reduced electric field distortion under extreme rainfall.