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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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

Received: 22 April 2022

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TM851

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	Articles by authors
	Hu Zhiying
	Geng Qiuyu
	Wei Lai
	Chang Yanan
	Li Qingmin

Cite this article:

Hu Zhiying,Geng Qiuyu,Wei Lai等. Synergistic Inhibitory Effect and Optimal Design Method of Driving Electrode and Particle Trap in DC GIS/GIL[J]. Transactions of China Electrotechnical Society, 2023, 38(12): 3338-3349.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220658 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I12/3338

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