Basic Study on Electrical Insulation by Clarifying Flashover Mechanisms along Insulating Spacer in Vacuum

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Insulating spacers that support high voltage conductors in vacuum suffer from very low insulation performance. The insulation design so far is based on experiences including empirical formulas. In the present research we offer a theoretical formula that enables calculation of flashover voltage, which we believe to help the reliable insulation designing. As the flashover in vacuum is triggered by the charging of insulators, we have conducted theoretical and experimental studies to obtain the surface charge distribution. The charge distribution has been incorporated to establish the theoretical formula. The experimentally obtained flashover voltages and the calculation results agreed for various insulator materials and their surface conditions.