Abstract：In order to analyze the influence of photoionization on streamer discharge in natural ester insulating oil, an ultraviolet absorber was used to regulate the photoionization behaviour of the streamer discharge; Axial length (velocity) and illuminance of streamer luminescence channels, temperature of streamer branches were quantitatively evaluated. Under conditions with a 25 mm needle-plate electrodes system, similar lightning pulse breakdown voltage, and breakdown time, the ultra-high-speed observations for luminescence channels and branches of streamers demonstrate that: streamer luminescence channel mainly propagates along the axis of needle-plate electrodes and approximately presents a morphology of straight line, while streamer branches propagate with dendritic morphology; The axial propagation velocity of streamer channel can increase from 1~2 km/s to 5~10 km/s and penetrates the oil gap 3~4 times in an approximately straight path, while the axial propagation velocity of the streamer branches keeps at 0.5~2.4 km/s; Overall, the illuminance of both positive and negative streamers can reach up to 104 Lx, but the average illuminance of positive streamer is slightly higher than that of negative streamer. The evolution of the luminescence channel of streamers reveals that the photoionization in the luminescence channel presents an explicit feature of step photoionization, i.e. "first excitation then ionization"; When photoionization is inhibited by the ultraviolet absorber, streamers tend to produce more radially propagated branches, consequently causing a decrease in axial stop length of streamer by 1~3 mm. In addition, the inhibition of photoionization leads to the increase of the maximum temperature of streamer by 74~220 K and the generation of more high-temperature hot spots in streamer branches, which promotes streamer to generate more radial branches. The analysis and results prove that the inhibition of photoionization weakens the axial electric field intensity in the head region of streamer branches, which can suppress the electron avalanche behavior at the head of streamer, therefore reducing the axial propagation rate of streamer branches.
李向荣, 王飞鹏, 黄正勇, 王强, 李剑. 光电离对天然酯绝缘油流注放电影响规律[J]. 电工技术学报, 2023, 38(12): 3350-3365.
Li Xiangrong, Wang Feipeng, Huang Zhengyong, Wang Qiang, Li Jian. Impact of Photoionization on Streamer Discharge in Natural Ester Insulating Oil. Transactions of China Electrotechnical Society, 2023, 38(12): 3350-3365.
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