Motion and discharge behavior of the free conducting linear particle within DC GIL

摘要

To investigate the motion and discharge behavior of free conducting linear particles in DC GIL, a coaxial cylindrical electrode is set up, with a high-speed camera to observe the motion and air-gap breakdown of the particles. The research work studies the charging behavior of the particle under DC voltage, then analyzes the particle's lifting voltage theoretically and experimentally. Two different motion patterns are observed, e.g. standing and bouncing, and the relationship between the probabilities of the two states' occurrence and the length of the particle is investigated through experiments. Mechanical analysis of the air-gap breakdown caused by free conducting linear particle is conducted based on the stream theory. The experimental results indicate that the lifting voltage of the linear particle is almost irrelevant to the length of the particle but has strong correlation with the radius. The length of the particle has an impact on the motion patterns, i.e. the shorter the particle, the greater the probability of bouncing, and vice versa. The length of micro-discharge gap increases with the particle length, while the breakdown voltage decreases with the particle length.