Abstract：The stress motion of linear metal particles in DC GIL can easily cause gas gap breakdown or surface flashover of insulators, which reduces the insulation performance of GIL and seriously affects the safe and reliable operation of the DC transmission system. In order to study the electrodynamic behavior mechanism of linear metal particles in DC GIL, the free particle experiment device and observation platform are built, and the particle electrodynamic model under DC is established. Through experiments and simulations, the characteristics of the linear particle lifting, motion and gas gap breakdown caused by particles are obtained, and the reasons of the particle lifting and motion are analyzed from the microscopic view. The results show that the lifting voltage is related to the radius and independent of length and voltage polarity. The voltage polarity does not affect the lifting voltage amplitude of metal particles. The particle motion and the resulting air gap breakdown are related to the particle radius, particle length and voltage polarity. The smaller the radius and the longer the length of the linear metal particles, the easier it is to cause the air gap to breakdown; the irregular shape of the linear metal particles strengthens the electric field distortion, and the polarity effect is more obvious. The effect of corona polarity leads to the lifting and motion of the particles under positive and negative polarities and the gas gap breakdown characteristics caused by motion show obvious laws. If the particles are lifted, under the DC positive polarity voltage, the linear metal particles will jump, rotate or standing upright near the lower electrode, and it is difficult to penetrate the air gap; under the negative polarity voltage, the particles will move through the air gap, and the phenomenon of flying firefly is easy to appear. It provides theoretical guidance for the prevention and control of the linear metal particle pollution in DC GIL.
程涵, 魏威, Bilal lqbal Ayubi, 孙优良, 张黎. 直流GIL中线形金属微粒电动力学行为研究[J]. 电工技术学报, 2021, 36(24): 5283-5293.
Cheng Han, Wei Wei, Bilal lqbal Ayubi, Sun Youliang, Zhang Li. Study on the Electrodynamic Behavior of Linear Metal Particles in DC Gas Insulated Transmission Line. Transactions of China Electrotechnical Society, 2021, 36(24): 5283-5293.
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