Metal particle induced spacer surface charging phenomena in direct current gas-insulated transmission lines

The interpretation of the surface charge pattern spacers in gas-insulated transmission lines (GIL) is an interesting and important research topic, which requires a comprehensive understanding behaviors at physical interfaces. Here, we report charging phenomenon presence metal particles inside direct current (DC) GIL. spherical particle on spacer appears as dotted discontinuously distributed spots are due to injection from induced gas ionization over surface. Concentrically bipolar patterns seen build up, trapping charges end tip acicular particle. lateral type obeys law dielectric barrier discharge needle-plate electrode intense DC electric field, may bring significant influence safety spacer. study this letter provides evidence demonstrating particles, serves basis design