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基于MHD的改进型保护间隙快速熄弧仿真
胡新宇1, 杨廷方1, 汪新秀2, 宋华伟3, 石发科1
1.长沙理工大学 电气与信息工程学院,湖南 长沙 410114;2.国网湖南省电力有限公司电力科学研究院,湖南 长沙 410007;3.国网湖南省电力有限公司检修公司,湖南 长沙 410004
摘要:
保护间隙用于防雷保护,虽然结构简单,但其空气间隙往往无法快速将电弧熄灭,进而导致线路的跳闸率升高。针对此问题,提出了在保护间隙旁加装一个拉弧线圈的方法,通过改变间隙的磁场分布,使得电弧所受的电磁力增加,电弧半径变小,从而加快电弧的熄灭。基于COMSOL仿真平台,根据磁流体力学(MHD)理论建立了间隙电弧放电仿真模型。仿真结果表明,改进型保护间隙的电弧偏移量远大于传统保护间隙,电弧最小半径为传统保护间隙的47%。现场实验证明,改进型保护间隙的电弧均能够在5 ms内被熄灭,远小于传统保护间隙熄弧时间,最大只有传统保护间隙熄弧时间的14.1%。
关键词:  保护间隙  有限元分析  磁流体力学  电弧仿真  电弧偏移
DOI:10.16081/j.epae.202202028
分类号:TM501+.2
基金项目:国家自然科学基金资助项目(51777015)
Fast arc extinction simulation for improved protective gap based on MHD
HU Xinyu1, YANG Tingfang1, WANG Xinxiu2, SONG Huawei3, SHI Fake1
1.School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410114, China;2.Electric Power Research Institute of State Grid Hunan Electric Power Co.,Ltd.,Changsha 410007, China;3.State Grid Hunan Electric Power Maintenance Company, Changsha 410004, China
Abstract:
The protective gap is used for lightning protection. Although the structure is simple, the air gap often cannot quickly extinguish the arc, which leads to the higher tripping rate of the transmission line. Aiming at this problem, a method of installing an arc coil next to the protective gap is proposed. By changing the magnetic field distribution of the gap, the electromagnetic force on the arc is increased, and the arc radius is decreased, thereby speeding up the arc extinction. Based on COMSOL platform, a gap arc discharge simulation model according to the theory of MHD(MagnetoHydroDynamics) is established. The simulative results show that the arc offset of the improved protective gap is far greater than that of the traditional protective gap, and the minimum arc radius of the improved protective gap is 47% of that of the traditional protective gap. Field experiment proves that the arc of the improved protective gap can be extinguished within about 5 ms, which is far less than the arc extinction time of the traditional protective gap, and the maximum time is only 14.1% of the arc extinction time of the traditional protective gap.
Key words:  protective gap  finite element analysis  magnetohydrodynamics  arc simulation  arc offset

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