Simulation Study on Mechanism of Secondary Breakdown to Encloser in the Process of Closing Short Bus-Bar in UHV GIS Disconnector Switch
Cui Jian1, Zhang Guogang1, Chen Yun2, Zhang Pengfei2, Cui Boyuan2
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China; 2. China Electric Power Research Institute Beijing 100192 China
Abstract：Gas insulated switchgear (GIS) is the core equipment in ultra-high voltage (UHV) transmission engineering, and its reliability is directly related to the safe and stable operation of the power system. In recent years, the phenomenon of secondary breakdown to ground has been observed during the process of closing short busbar in the UHV GIS disconnector: In the disconnector, besides the discharge channel between the static and dynamic contacts, a discharge channel from the electrode to the ground is formed, which then lead to a fault warning. This problem poses a serious insulation threat to the UHV GIS equipment and affects the stable operation of the UHV GIS equipment. However, since previous studies were mainly concerned with the very fast transient overvoltage (VFTO) generated during the operation of the disconnector, and insufficient attention has been paid to the breakdown characteristics during the operation of the disconnector. Therefore, the current understanding of the mechanism of secondary breakdown during the process of closing short busbar in the UHV GIS disconnector is weak. To address this problem, the simulation work for the secondary breakdown phenomenon during the process of closing short busbar in the UHV GIS disconnector are carried out and analyzed. Firstly, a method for simulating the long distance stream discharge bifurcation with low computational cost is proposed, which solves the problem that the traditional stream discharge simulation methods require too much computational cost to simulate the long distance (hundreds millimeters or more) stream discharge bifurcation. Subsquently, the proposed method is compared with the particle in cell-Monte Carlo collision (PIC-MCC) method by taking a small size (several millimeters) model as an example, which proves the rationality of the proposed method. Compared with the calculation results of PIC-MCC method, the overlap area of the main streamer development path is about 90%, the overlap area of the secondary streamer development path is about 70%, the breakdown time difference is less than 11%, and the grid resources required for the proposed method are only 2% of the PIC-MCC method. Finally, the breakdown phenomenon during the process of closing short busbar in the UHV GIS disconnector was repeatedly simulated by using the long distance stream discharge bifurcation simulation method based on the phase field method. The mechanism of the secondary breakdown was revealed and the factors affecting the secondary breakdown were explored. The results of the study reveal that if there exists a certain secondary streamer head develops outside of the shielding area of the shielding cover, when the first breakdown between the static and dynamic contacts is finished during the process of closing short busbar in the UHV GIS disconnector, the secondary breakdown between the contacts and the shell will occur. Increasing the curvature radius of the contact surface and reducing the burr defects on the contact surface, which can reduce the spacing between the static and dynamic contacts at the time of the first breakdown, will effectively limit the development of the secondary streamer, and then prevent the head of secondary streamer exceeding the shielding area of the shielding cover, and finally inhibit the occurrence of the secondary breakdown phenomenon during the process of closing short busbar in the UHV GIS disconnector. Increasing the size of the shielding cover to enhance its shielding area can also effectively inhibit the occurrence of the secondary breakdown phenomenon during the process of closing short busbar in the UHV GIS disconnector.
崔建, 张国钢, 陈允, 张鹏飞, 崔博源. 特高压GIS隔离开关切合短母线过程中对地二次击穿机理仿真研究[J]. 电工技术学报, 2024, 39(19): 6201-6214.
Cui Jian, Zhang Guogang, Chen Yun, Zhang Pengfei, Cui Boyuan. Simulation Study on Mechanism of Secondary Breakdown to Encloser in the Process of Closing Short Bus-Bar in UHV GIS Disconnector Switch. Transactions of China Electrotechnical Society, 2024, 39(19): 6201-6214.
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