The essence of the mathematical model of disconnectors' multiple reignition arc is the repeated breakdowns of SF6. In this study, the kinetic properties of microparticles are studies based on the streamer discharge theory, and a fluid arc mathematical model applied in centimetre clearance is established. Ultra-High Voltage (UHV) disconnector manufactured by Pingao Electric Co. Ltd of Henan Province is selected as the object and the resistance change process of contact clearance multiple reignition arc is simulated by finite difference method-finite element method-flux corrected transport self-programming in MATLAB based on the chamber structure and operating characteristics. UHV gas-insulated switchgear very fast transient overvoltage (VFTO) test platform is built to gain the characteristics of VFTO waveforms generated by the disconnector's operation. Compared with simulation results, the test data shows that the fluid arc mathematical model can scientifically explain the dynamic development process of microparticles in the contact clearance and the calculation results are consistent with the test data. In addition, the arc fluid mathematical model combines the structure and operating characteristics of the switch with the development process of microparticles, which can better guide the design of the switch, and provide a theoretical basis for the suppression of VFTO with the disconnector itself.

中文翻译：

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极快速瞬态过电压下隔离开关电弧的流体模型研究

隔离开关的多重点火弧数学模型的实质是SF6的反复击穿。在这项研究中，基于流光放电理论研究了微粒的动力学特性，并建立了应用于厘米间隙的流体电弧数学模型。以河南省平高电气有限公司生产的超高压隔离开关为对象，采用有限差分法-有限元法-磁通修正自输法模拟了接触间隙多点复燃电弧的电阻变化过程。基于腔室结构和操作特性的MATLAB编程。建立了特高压气体绝缘开关设备极快速瞬态过电压（VFTO）测试平台，以获取由隔离开关产生的VFTO波形的特征 的操作。与仿真结果相比，试验数据表明，流体电弧数学模型可以科学地解释接触间隙中微粒的动态发展过程，计算结果与试验数据吻合。此外，电弧流体数学模型将开关的结构和操作特性与微粒的发展过程相结合，可以更好地指导开关的设计，并为隔离开关本身抑制VFTO提供理论依据。