Effect of Vibration on Surface Charge Accumulation with Metal Particle on DC GIS Insulator

This study reports on the influence of vibration on surface charge accumulation when a metal particle is on the $D C$ GIS insulator. A full-sized disc epoxy insulator that can be used in DC GIS attached by a metal particle was selected as a test sample. A surface charge measurement platform was applied to obtain the charge accumulation of the insulator in ± 30 kV. A vibration-generating system was designed to provide two different vibration modes, the maximum acceleration and the impact frequency of Mode A were $338.9 \mathrm{~m} / \mathrm{s}^{2}$ and $1.1 \mathrm{~Hz}$, while those of Mode B were $4.6 \mathrm{~m} / \mathrm{s}^{2}$ and $107.5 \mathrm{~Hz}$. The results showed that, in the presence of metal particles, the vibration could aggravate the decrease of homo-charges and the increase of hetero-charge on the insulator surface. It is considered that under the normal electric field, vibration promotes the homocharges to disperse to the air phase and this effect becomes obvious with the increase of vibration acceleration and has little to do with frequency.