Analysis and comparison of streamer discharge characteristics in equipotential live-line work gap and its simplified gaps under positive switching impulse

IF 1.9 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Journal of Electrostatics Pub Date : 2024-10-01 DOI:10.1016/j.elstat.2024.103985

Yaqi Fang, Hao Zeng, Bingsen Yang, Suhan Mao, Junkang Fang

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引用次数: 0

Abstract

Equipotential live-line work (EPLW) is crucial for uninterrupted operation and maintenance of extra-high voltage (EHV) and ultra-high voltage (UHV) transmission lines. Determining the minimum approach distance (MAD) for EHV and UHV systems needs a thorough grasp of EPLW gap discharge mechanisms and characteristics for worker protection. Therefore, we conduct positive switching impulse discharge experiments on EPLW gap and its simplified gaps at a gap distance of 3 m, study the discharge development process and streamer inception characteristics of two gaps, and perform comparative analysis. The experimental results show that sim-worker's feet-test tower gap and the bundle conductor + rod-plane gaps (rod electrode with radii of 2.5 cm and 5 cm) occur multiple streamer inception. The bundle conductor + rod electrode with a radius of 8 cm only has one streamer inception. The average inception voltage, inception time delay and its dispersion of bundle conductor + rod electrode will all rise with the size of the electrode. Compared to the bundle conductor + rod electrodes with radii of 2.5 cm and 8 cm, the average streamer inception time delay and inception voltage of sim-worker's feet are only 3.6 % and 5.1 % subtly higher than those of the bundle conductor + rod electrode with a radius of 5 cm, and a high degree of similarity is exhibited in their probability distribution trends of streamer inception time delay. A larger electrode size will increase the boost time delay, statistical time delay, and its dispersion of bundle conductor + rod electrode, they are closer to sim-worker's feet when the radius of bundle conductor + rod electrode is 5 cm.

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等电位带电线路工作间隙及其简化间隙在正开关脉冲下的流线放电特性分析与比较

等电位带电作业（EPLW）对于特高压（EHV）和超高压（UHV）输电线路的不间断运行和维护至关重要。要确定超高压和特高压系统的最小接近距离 (MAD)，就必须全面掌握带电作业间隙放电机制和特性，以保护工人。因此，我们在 3 米间距下对 EPLW 间隙及其简化间隙进行了正开关脉冲放电实验，研究了两种间隙的放电发展过程和流线萌生特性，并进行了对比分析。实验结果表明，模拟工人脚踏试验塔间隙和束状导体 + 杆状平面间隙（杆状电极半径分别为 2.5 厘米和 5 厘米）出现了多次流线萌生。半径为 8 厘米的束导体 + 杆电极仅有一次流线萌发。束状导体+棒状电极的平均萌发电压、萌发时间延迟及其分散性都会随着电极尺寸的增大而增大。与半径分别为 2.5 厘米和 8 厘米的束状导体+棒状电极相比，模拟工人脚的平均流线萌发时间延迟和萌发电压仅比半径为 5 厘米的束状导体+棒状电极略高 3.6 % 和 5.1 %，且两者的流线萌发时间延迟概率分布趋势具有高度相似性。电极尺寸越大，束导体+杆电极的升压延时、统计延时及其分散性越大，当束导体+杆电极半径为 5 cm 时，它们更接近模拟工人的脚。

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来源期刊

Journal of Electrostatics 工程技术-工程：电子与电气

CiteScore

4.00

自引率

11.10%

发文量

审稿时长

49 days

期刊介绍： The Journal of Electrostatics is the leading forum for publishing research findings that advance knowledge in the field of electrostatics. We invite submissions in the following areas: Electrostatic charge separation processes. Electrostatic manipulation of particles, droplets, and biological cells. Electrostatically driven or controlled fluid flow. Electrostatics in the gas phase.