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In bridged vacuum gaps, it is believed that the secondary electron emission avalanche (SEEA) and the resultant insulator charging play a crucial role in the progress of discharge leading to the surface flashover. This paper deals with the electric field just before the flashover that includes the accumulated SEEA charge component (EsF) and applied geometrical field component (EgF) on a cathode and...
This paper reports the characteristic of flashover voltage and its relation to the electric field strength on a cathode. The test gap consisted of parallel disc electrodes bridged by an insulating solid cylinder made of Al2O3. The electric field just before the flashover, which included an applied geometrical field component Eg and a surface charge component Es, was measured by using a ring type electrostatic...
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