Influence of alumina characteristics on charging mechanism in vacuum

Abstract

nb.smn In order to enhance the electrical insulation performance of vacuum circuit breakers (VCBs), the surface charging mechanism on solid dielectrics in vacuum needs to be clarified. We investigated the charging characteristics on various types of alumina dielectrics for the different AIIO, contents, manufacturing conditions and surface roughness. We applied negative dc ramped voltage on the high voltage electrode and measured the surface charging potential. The experimental results revealed that the charging process was not practically influenced by A120, contents but by the surface roughness.