直流GIS/GIL中驱赶电极与微粒陷阱的协同抑制作用及优化设计方法

doi:10.19595/j.cnki.1000-6753.tces.220658

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摘要

直流气体绝缘组合电器和封闭输电线路中的运动金属微粒是造成绝缘故障的重要原因,采用驱赶电极可使微粒朝远离绝缘子的方向运动,与微粒陷阱配合使用可显著提高微粒的捕获概率。该文首先建立了微粒与驱赶电极的碰撞动力学模型,发现受驱赶电极作用的微粒落点具有强集中性,进而考虑电场畸变特性与微粒落点分布对驱赶电极的结构参数进行了优化设计。进一步以微粒陷阱的捕获概率优化为目标,提出驱赶电极与微粒陷阱的协同布置策略,相较于无驱赶电极时,陷阱布置在驱赶电极下微粒集中落点位置时的捕获概率提升了20 %。同时,考虑驱赶电极对陷阱中微粒入射角的影响,提出驱赶电极与微粒陷阱结构参数的协同优化方法,增加了微粒在陷阱内碰撞次数,提高了微粒陷阱的捕获概率。具体结果表明,当驱赶电极倾角为8 °、陷阱倾角为50 °时,微粒陷阱的捕获概率最高,可达69.8 %。通过搭建包含驱赶电极与微粒陷阱的实验平台,验证了协同布置策略与参数优化方法的有效性。所提出的驱赶电极与微粒陷阱的协同设计方法适用于不同尺寸的直流气体绝缘装备,可为实际工程的微粒有效抑制提供指导。

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	胡智莹
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	常亚楠
	李庆民

关键词 ：驱赶电极, 微粒陷阱, 协同抑制, 优化设计方法

Abstract：

Moving metal particles in DC gas-insulated composite appliances and closed transmission lines is the main cause of insulation failure. The driving electrode can make particles move away from the insulator, and the capture probability of particle traps can be significantly improved when used together with driving electrodes.
This paper established the dynamic collision model between the particle and the driving electrode. It was found that the particles affected by the driving electrode have strong concentrations. Then, the structural parameters of the driving electrode were optimized by considering the electric field distortion characteristics and the distribution of the particles, as shown in Fig.A1. For the scaled model of gas-insulated equipment with a conductor radius of 20 mm and an internal shell radius of 60 mm, when the length of the convex part is set to 8 mm, the electrode dip angle is 6 °~10 °, and the fillet radius is 3 mm. The initial placement position of the particles is distributed away from the insulator side, which can effectively suppress the movement of the particles to the insulator.
Furthermore, aiming at optimizing particle trap capture probability, a synergistic arrangement strategy of the driving electrode and the particle trap was proposed, as shown in Fig.A2. The driving electrode is sleeved on the high-voltage electrode and arranged near the insulator. The particle trap is arranged at the concentrated drop point of the particles under the driving electrode. Compared with the case without the driving electrode, the capture probability of the trap at the location of particle concentration under the driving electrode is increased by 20 %.
At the same time, considering the effect of the driving electrode on the incident angle of the particles in the trap, a synergistic optimization method of the driving electrode and the structural parameters of the particle trap was presented, which increased the collision times of particles in the trap and improved the capture probability of the particle trap. The results show that when the angle of the drive electrode is 8 ° and the angle of the trap is 50 °, and the capture probability of the particle trap is optimum, reaching 69.8 %. An experimental platform containing driving electrodes and particle traps was built to verify the effectiveness of the cooperative arrangement strategy and parameter optimization method.
Based on an actual UHV AC GIL, the versatility of the proposed method for different voltage-level equipment was discussed. Even though the particle motion characteristics at different voltages are numerically different, the motion law of the particles after collision with the driving electrode is the same for different voltages. Therefore, the proposed synergistic optimization method of driving electrode and particle trap is suitable for different sizes of DC gas-insulated equipment and can guide effective particle suppression in practical engineering.

Key words： Driving electrode particle trap synergistic inhibition optimal design method

收稿日期: 2022-04-22

PACS:

TM851

通讯作者: 李庆民男,1968年生,教授,博士生导师,研究方向为高电压与绝缘技术、放电物理。E-mail: lqmeee@ncepu.edu.cn

作者简介: 胡智莹女,1999年生,硕士研究生,研究方向为GIL金属微粒运动与抑制。E-mail: huzhiyingnuli@163.com

引用本文:

胡智莹, 耿秋钰, 魏来, 常亚楠, 李庆民. 直流GIS/GIL中驱赶电极与微粒陷阱的协同抑制作用及优化设计方法[J]. 电工技术学报, 0, (): 230603-230603. Hu Zhiying, Geng Qiuyu, Wei Lai, Chang Yanan, Li Qingmin. Synergistic Inhibitory Effect and Optimal Design Method of Driving Electrode and Particle Trap in DC GIS/GIL. Transactions of China Electrotechnical Society, 0, (): 230603-230603.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.220658 https://dgjsxb.ces-transaction.com/CN/Y0/V/I/230603

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