Lifting Field of Free Conducting Particles in Compressed SF6 with Dielectric Coated Electrodes

Effect of Metallic Particles on E-field Enhancement in Extra High Voltage Gas-insulated Transmission Lines

“…Based on analysis and previous experience of researchers [2], [4], field enhancement is sufficiently high for inception of breakdown, although the difference of field enhancement is marginal, with and without dielectric coating. The decrease in E-field enhancement is only marginal with increase in coating thickness.…”

“…Even with high levels of quality control, particle contamination is unavoidable. Under an applied electric field, a conducting particle acquires an electrical charge and lifts off from its resting position on the grounded enclosure when the electrostatic force from the electrostatic field (E-field) equalizes with gravitational force [2]. Particle movement plays a crucial role in determining the insulation behavior of gasinsulated systems.…”

“…Numerous interrelated factors influence the degree to which particles reduce the dielectric withstanding capabilities of GIS. During service, the breakdown strength of SF 6 gas depends on a number of parameters, such as length and diameter of particles present, metallic or non-metallic type, quantity and nature of material, position of particles, type of particle movement, operating gas pressure, proportion of SF 6 gas quantity, and effectiveness of particle collection or trapping techniques [1]- [2].…”

A system for computer-aided theoretical and experimental analysis of impurity particle motion in dielectric liquids

“…Attempts have been made also in the direction indicated by Ref. 11. with promiSing but incomplete resul ts.…”

Factors affecting the dynamics of wire particles in gas‐insulated systems

“…-improvement of the conductor roughness and hence decreasing the high local field [8, 12,13], -coating resistance reduces the development of predischarge in the gas [8], and significant reduction in the particle charge during impacts and increase in the lifting field with the increase in the coating thickness and/or gas pressure [8,121. Adhesive coatings can also be used to adhere particles to a certain surface.…”