交流气体绝缘输电线路微粒运动特性及其陷阱参数优化方法

交流气体绝缘输电线路(GIL)中，针对金属微粒带电运动的较大随机性和现场试验手段的局限性，本文参考国内正运行的某252 kV交流GIL的尺寸，在COMSOL中建立1:1的三维仿真模型，以此实现模拟的仿真运动轨迹与实际运动轨迹之间的有效对称性。首先，获取运行电压等级下不同尺寸微粒的动态特性；其次，考虑不同形状的微粒陷阱，从电场调控、捕获概率角度优化了陷阱主要参数；最后，在盆式绝缘子凹凸面两侧各布置微粒陷阱，优化布置策略，并提出了针对252kV交流GIL的微粒陷阱优化方案。研究结果表明：当选取圆孔形状微粒陷阱及其厚度、槽间距和槽宽度分别为10mm、6mm和8mm，并且当距凹凸面绝缘子两边分别70mm和80mm处的外壳底部各布置一个陷阱时，两边陷阱的捕获率分别可高达78%和70%。因此，本文的分析和优化方法对某电压等级交流GIL优化微粒陷阱具有重要的参考价值。

Particle motion characteristics and trap parameter optimization of AC gas insulated transmission lines

In AC gas-insulated transmission lines, in order to address the large randomness of the charged motion of metal particles and the limitations of field test methods, this paper refers to the dimensions of a 252 kV AC GIL in operation with China, and establishes a 1:1 3D simulation model in COMSOL, so as to achieve effective symmetry between the simulated motion trajectory and the actual motion trajectory. Firstly, the dynamic characteristics of particles with different sizes at operating voltage levels are obtained by simulation; Secondly, the main parameters of trap are optimized in terms of electric field regulation and capture probability, considering different shapes of particle traps; Finally, particle traps are arranged on each side of the concave and convex face of the basin insulator to optimize the arrangement strategy and an optimization scheme for particle traps is proposed for the 252 kV AC GIL. The research results show that the trap are selected in the shape of circular hole and its thickness, slot spacing and slot width are selected as 10mm, 6mm and 8mm respectively. When the trap is arranged at the bottom of the housing 70mm and 80mm from both sides of the concave and convex insulator, the capture rate of the traps on both sides can be as high as 78% and 70%, respectively. Therefore, the analysis and optimization methods in this paper have important reference value for the optimization of particle traps in a certain voltage level AC GIL.