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| 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 |
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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.
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Received: 25 August 2023
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[1] 刘振亚. 特高压电网[M]. 北京: 中国经济出版社, 2005.
[2] 韩先才, 孙昕, 陈海波, 等. 中国特高压交流输电工程技术发展综述[J]. 中国电机工程学报, 2020, 40(14): 4371-4386, 4719.
Han Xiancai, Sun Xin, Chen Haibo, et al.The overview of development of UHV AC transmission technology in China[J]. Proceedings of the CSEE, 2020, 40(14): 4371-4386, 4719.
[3] 刘鹏, 郭伊宇, 吴泽华, 等. 特高压换流站大尺寸典型电极起晕特性的仿真与试验[J]. 电工技术学报, 2022, 37(13): 3431-3440.
Liu Peng, Guo Yiyu, Wu Zehua, et al.Simulation and experimental study on corona characteristics of large size typical electrodes used in UHV converter station[J]. Transactions of China Electrotechnical Society, 2022, 37(13): 3431-3440.
[4] 苏春强, 丁登伟, 李强, 等. GIS隔离开关方式1试验中断口对地击穿时光电暂态过程监测与分析[J]. 高压电器, 2022, 58(5): 56-62.
Su Chunqiang, Ding Dengwei, Li Qiang, et al.Monitoring and analysis of optical and electric transient process induced by breakdown-to-ground during type test duty 1 of GIS disconnector[J]. High Voltage Apparatus, 2022, 58(5): 56-62.
[5] 申萌, 丁登伟, 李强, 等. GIS隔离开关开合短母线型式试验方式1中VFTO测量系统构建及波形解析[J]. 高压电器, 2022, 58(7): 207-213.
Shen Meng, Ding Dengwei, Li Qiang, et al.Construction of VFTO measurement system and waveform analysis for switching test duty 1 of short busbar by GIS disconnector[J]. High Voltage Apparatus, 2022, 58(7): 207-213.
[6] 王安琪. 1100 kV GIS特快速暂态过电压研究[D]. 厦门: 厦门理工学院, 2020.
Wang Anqi.Research on very fast transient overvoltage of 1100 kV GIS[D]. Xiamen: Xiamen University of Technology, 2020.
[7] Morrow R.Theory of negative corona in oxygen[J]. Physical Review A, General Physics, 1985, 32(3): 1799-1809.
[8] Aleksandrov N L, Bazelyan E M.Simulation of long-streamer propagation in air at atmospheric pressure[J]. Journal of Physics D: Applied Physics, 1996, 29(3): 740-752.
[9] Bourdon A, Pasko V P, Liu N Y, et al.Efficient models for photoionization produced by non-thermal gas discharges in air based on radiative transfer and the Helmholtz equations[J]. Plasma Sources Science Technology, 2007, 16(3): 656-678.
[10] Beloplotov D V, Sorokin D A, Lomaev M I, et al.Formation of a negative streamer in a sharply nonuniform electric field and the time of generation of runaway electrons[J]. Russian Physics Journal, 2020, 62(11): 1967-1975.
[11] 臧奕茗, 钱勇, 刘伟, 等. C4F7N/CO2混合气体中尖端缺陷的流注放电仿真研究[J]. 电工技术学报, 2020, 35(1): 34-42.
Zang Yiming, Qian Yong, Liu Wei, et al.Simulation study on streamer of tip defects in C4F7N/CO2 mixed gas[J]. Transactions of China Electrotechnical Society, 2020, 35(1): 34-42.
[12] He Wei, Liu Xinghua, Yang Fan, et al.Numerical simulation of direct current glow discharge in air with experimental validation[J]. Japanese Journal of Applied Physics, 2012, 51(2R): 026001.
[13] Gao Qingqing, Niu Chunping, Adamiak K, et al.Numerical simulation of negative point-plane corona discharge mechanism in SF6 gas[J]. Plasma Sources Science and Technology, 2018, 27(11): 115001.
[14] Zeng F, Zhang M, Yang D, et al.Hybrid numerical simulation of decomposition of SF6 under negative DC partial discharge process[J]. Plasma Chemistry and Plasma Processing, 2019, 39(1): 205-226.
[15] Dawson J.One-dimensional plasma model[J]. Physics of Fluids, 1962, 5(4): 445-459.
[16] Dawson J M.Thermal relaxation in a one-species, one-dimensional plasma[J]. The Physics of Fluids, 1964, 7(3): 419-425.
[17] Liewer P C, Decyk V K.A general concurrent algorithm for plasma particle-in-cell simulation codes[J]. Journal of Computational Physics, 1989, 85(2): 302-322.
[18] Vahedi V, Surendra M.A Monte Carlo collision model for the particle-in-cell method: applications to argon and oxygen discharges[J]. Computer Physics Communications, 1995, 87(1/2): 179-198.
[19] 段韶峰. GIS隔离开关瞬态电弧的建模与仿真[D]. 北京: 华北电力大学, 2016.
Duan Shaofeng.Modeling and simulation of very fast transient spark in disconnecting switch of gas insulated switchgear[D]. Beijing: North China Electric Power University, 2016.
[20] Suo Z.Models for breakdown-resistant dielectric and ferroelectric ceramics[J]. Journal of the Mechanics and Physics of Solids, 1993, 41(7): 1155-1176.
[21] Beom H G, Kim Y H.Application of J integral to breakdown analysis of a dielectric material[J]. International Journal of Solids and Structures, 2008, 45(24): 6045-6055.
[22] Chaitanya Pitike K, Hong Wei.Phase-field model for dielectric breakdown in solids[J]. Journal of Applied Physics, 2014, 115(4): 044101.
[23] Shen Zhonghui, Wang Jianjun, Jiang Jianyong, et al.Phase-field modeling and machine learning of electric-thermal-mechanical breakdown of polymer-based dielectrics[J]. Nature Communications, 2019, 10(1): 1843.
[24] Mi Zhang, Zhang Yong, Hou Xu, et al.Phase field modeling of dielectric breakdown of ferroelectric polymers subjected to mechanical and electrical loadings[J]. International Journal of Solids and Structures, 2021, 217: 123-133.
[25] Li Jin, Wang Yufan, Liu Songtao, et al.Thermal-elastic free energy driven electrical tree breakdown process in epoxy resin under temperature gradient[J]. Materials Today Communications, 2022, 33: 104951.
[26] 李长云, 李岩青, 于永进. 大气条件下厘米级棒-板间隙负极性电晕放电中流注的产生与发展机制[J]. 电工技术学报, 2024, 39(3): 887-900.
Li Changyun, Li Yanqing, Yu Yongjin.The generation and development mechanism of streamers in centimeter-level rod-plate gap negative corona discharge under atmospheric conditions[J]. Transactions of China Electrotechnical Society, 2024, 39(3): 887-900.
[27] 彭长志, 董旭柱, 赵彦普, 等. 正极性先导起始与发展过程中的等离子体特征[J]. 电工技术学报, 2023, 38(2): 533-541.
Peng Changzhi, Dong Xuzhu, Zhao Yanpu, et al.Plasma characteristics of positive leader inception and development[J]. Transactions of China Electrotechnical Society, 2023, 38(2): 533-541.
[28] Morrow R.A survey of the electron and ion transport properties of SF6[J]. IEEE Transactions on Plasma Science, 1986, 14(3): 234-239.
[29] 赵虎, 李兴文, 贾申利. SF6及其混合气体临界击穿场强计算与特性分析[J]. 西安交通大学学报, 2013, 47(2): 109-115.
Zhao Hu, Li Xingwen, Jia Shenli.Calculation and characteristic analysis of critical breakdown field strength of SF6 and the mixtures[J]. Journal of Xi’an Jiaotong University, 2013, 47(2): 109-115.
[30] Yousfi M, Robin-Jouan P, Kanzari Z.Breakdown electric field calculations of hot SF6 for high voltage circuit breaker applications[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2005, 12(6): 1192-1200.
[31] The LXCat Team. Biagi (transcription of data from SF Biagi's Fortran code, Magboltz) database[DB/OL]. (2021-02-11)[2023-10-16]. https://www.lxcat.net/Biagi.
[32] Christophorou L G, Olthoff J K.Electron interactions with SF6[J]. Journal of Physical and Chemical Reference Data, 2000, 29(3): 267-330. |
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2024, Vol. 39 
