Search results

Sort By:

Limit search:

Impact of Volume Breakdown on Surface Flashover in High Pressure SF_{6}

100%

Neuber A., Krile J., Rogers G., Krompholz H.

Acta Physica Polonica A

2009

vol. 115

issue 6

995-997

We investigate the pulsed flashover voltage of dielectric samples at up to 4 bar SF_{6} in the simultaneous presence of a high current (>10 kA, ∼20 microsecond pulse) volume discharge nearby. The chosen distance, ∼7 cm, between surface and volume breakdown is consistent with conditions found in the Sandia-Z-machine type rimfire switch. For a flashover gap distance of 24 mm and a simultaneous excitation within ∼ 5 microseconds, we observe an average reduction in the flashover voltage from 164 kV to 142 kV at 3.7 bar when the volume discharge is turned on. The test setup utilizing a magnetic switching scheme operating at 320 kV and 10 kA is briefly discussed along with the breakdown properties and the spectral characterization of the volume/surface flashover discharge plasma. In general, UV light propagates relatively unattenuated for wavelengths >160 nm in the high pressure SF_{6} from the volume discharge to the dielectric surface, setting up conditions which are conducive to photoelectron emission from the dielectric.

Refine search results

1 Acta Physica Polonica A

1 2009

1 Krile J.

1 Krompholz H.

1 Neuber A.

1 Rogers G.

Search results

Impact of Volume Breakdown on Surface Flashover in High Pressure SF_{6}