Green gas for grid as an eco-friendly alternative insulation gas to SF₆: From the perspective of PD initiated by metallic particles under DC

This paper dealt with characteristics of partial discharge (PD) initiated by metallic particles under DC voltage in green gas for grid (g3), which is an emerging and promising eco-friendly alternative insulation gas to SF₆. Experimental setup was configured to simulate PD under DC in gas-insulated power facilities. Two types of particle, namely rectangle particle and sphere particle were used. The results indicated that the discharge inception voltages in g3 gas were 90.1-92.5% of that in SF₆. In two particles, PD occurred with higher average apparent charge and discharge repetition rate in g3 compared with those in SF₆ gas. The time-resolved partial discharge presented similar characteristics in g3 and SF₆ gas. The time interval between two successive discharge pulses were 0.1 ms-10 ms and 5 ms-15 ms in the rectangle particle and sphere particle, respectively. Results from this paper are expected to provide fundamental material for the development of SF₆ -free gas-insulated power apparatus.