光电离对天然酯绝缘油流注放电影响规律研究

doi:10.19595/j.cnki.1000-6753.tces.220409

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摘要

利用紫外吸收剂调控天然酯绝缘油流注放电的光电离行为,对正负极性流注发光通道轴向长度（速度）、发光照度及流注分支中温度分布等开展了定量评估,以解析光电离对流注放电的影响规律。在25 mm 针-板电极系统及相近的雷电冲击击穿电压和击穿时间下,流注发光和流注分支的超高速观测结果表明：流注发光通道主要沿针-板电极轴向发展并呈近似直线形态,而流注分支则以树枝形态发展;流注发光通道沿轴向速度可从1~2 km/s 激增至5~10 km/s,并以近似直线方式贯穿油隙3~4 次,而流注分支轴向发展速度则均保持在0.5~2.4 km/s;整体来看,正、负极性流注的发光照度均可高达104 lx,但正极性流注的平均发光照度略高于负极性流注。流注发光通道演变行为表明,发光通道中的光电离呈现为明显的“先激励,再电离”的分级光电离特征;当光电离被紫外吸收剂抑制后,流注趋于产生更多径向发展分支,并因此导致流注轴向停止长度缩短1~3 mm。此外,抑制光电离导致流注通道内最高温度上升约74~220 K,在流注分支通道内产生了更多的高温热点,促进流注形成更多径向分支。分析结果证明,由于抑制光电离削弱了流注分支头部区域的轴向电场强度,从而抑制了流注头部的电子雪崩行为,因此降低了流注分支沿轴向发展速率。

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关键词 ：天然酯绝缘油, 流注放电, 光电离, 流注分支

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 needleplate 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.

Key words： Natural ester insulating oil streamer discharge photoionization streamer branches

收稿日期: 2022-03-21

PACS:	TM85
	TM21

基金资助:

国家自然科学基金（51425702,52177016,52130707,52107017,2018YFB0905802 , U1866603 ）和高等学校学科创新引智计划（BP0820005）资助

通讯作者: 王飞鹏男,1977年生,教授,博士生导师,研究方向为高电压绝缘技术。E-mail：fpwang@cqu.edu.cn

作者简介: 李向荣男,1989 年生,博士研究生,研究方向为高电压绝缘技术。E-mail：731496207@qq.com

引用本文:

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研究[J]. 电工技术学报, 0, (): 157-157. 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, 0, (): 157-157.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.220409 https://dgjsxb.ces-transaction.com/CN/Y0/V/I/157

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