Motion of free conducting particles in SF/sub 6/ insulated systems under dc switching voltages

SF6 decomposition components under different metallic free‐conducting wire‐type particles in positive DC partial discharge

“…4 A test voltage of U = 28 kV was applied on the ball-bowl model electrode. 5 The test voltage applied on the ball-bowl electrode lasted for 96 h. SF 6 decomposition sample gas was collected every 12 h from an aspirating hole. Then, the volume fraction of the decomposition components of the sample gas was obtained using GC/MS.…”

“…Formula (5) shows that the value of the start moving electric field was associated only with the density and the radius of the particle. Therefore, the start moving electric field of the different free-conducting metal particles was different under the same impress voltage and size.…”

Investigation of states recognition of motion conducting particles under DC voltages using the pulse current method

“…Without the influence of the gas buoyancy, if + > is establish, the conducting particle will float from the ground electrode surface and eventually reach the high voltage electrode. When the particles approach the high voltage electrode, the gap discharge will be produced between the particle and the high voltage electrode [9][10][11]. This discharge will lead to two results: 1) The particle changes the polarity； 2) The partial discharge causes the gap breakdown.…”

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

“…Therefore, it is of significant importance to investigate the behaviour of such metallic particles in GITL/GIS systems even if the conductors are dielectrically coated. The effect of DC prestress (due to the trapped charge left on the load side after interruption of capacitive currents and/or during disconnector switching [ 171) is simulated to study how these superimposed impulse voltages will affect the particle dynamics.…”