Clarification of metallic particle motion is important to attain high reliability of gas insulated switchgear (GIS). Existing calculation methods have been developed only for AC voltage, and have been not applicable for DC voltage. Because partial discharges at particles in gas gap have a great influence on particle motion under DC voltage and these existing calculation methods have not considered the partial discharges. Partial discharges of particle were investigated in order to adopt them into the calculation model. The calculation model considers the following phenomena: (1) moment of the particle around the center of gravity, (2) electric charge and discharge at both pointed tips of the particle, (3) mirror image of the particle near the wall. The model has been applied to DC electric field conditions, and was able to correctly calculate the crossing motion or firefly phenomenon of the metallic particle.
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