Breakdown mechanism of a gap with a small arc current in SF/sub 6/ gas

Abstract

Using an experimental apparatus modeled for a gas-insulated switchgear (GIs), the influence of the arc duration on the breakdown voltage between the contact and the grounded tank of the GIS was investigated in the case that the arc was kept ignited in the contact area. From the result, characteristics of the breakdown voltage vs. the arc duration were found to be divided into six stages and the characteristics in each stage were estimated.

Dispersion characteristics of switching transients from large‐scale experiments in a 1100 kV gas insulated switchgear circuit

“…Therefore, the waveform characteristics of them should be closely related to the arc discharge process of spark discharge in theory [17]. S. Sugiyama et al [18] and B. Lu et al [19] both find from simulation results that the discharge gap length, gas pressure, electrode material and the initial electric field around the contacts of disconnector can affect the amplitude, wavefront rising rate and rising trend of the arc voltage. Z. Li et al [20] carried out some discharge researches in a 252 kV GIS circuit and found that the wavefront rise time of VFTO are affected by the peak value of arc current, the trapped charge on the load side and gap distance.…”

“…S. Sugiyama et al. [18] and B. Lu et al. [19] both find from simulation results that the discharge gap length, gas pressure, electrode material and the initial electric field around the contacts of disconnector can affect the amplitude, wavefront rising rate and rising trend of the arc voltage.…”