高压直流复合绝缘子表面电荷积聚机理及其仿真研究

发布时间：2018-05-03 22:02

本文选题：复合绝缘子 + 表面电荷　；参考：《湖南大学》2014年硕士论文

【摘要】：复合绝缘子由于其优异的防污闪性能，，已成为高压输电外绝缘的主要载体。表面电荷的存在会导致复合绝缘子沿面闪络电压的下降，因此研究在高压直流情况下，复合绝缘子表面电荷积聚机理对于提高复合绝缘子的绝缘性能具有重要的意义。本文主要的研究内容包括建立复合绝缘子模型，并仿真分析表面电荷积聚对该模型电场分布的影响。其次，针对大气环境下复合绝缘子气体放电过程进行了仿真模拟。最后实验验证仿真模拟结果，以期能够更加深刻地理解复合绝缘子表面电荷的积聚机理，进而为复合绝缘子的设计提供必要的理论支持。本文根据型号为FXBW6-10/70的复合绝缘子尺寸，建立了对应的复合绝缘子模型。使用有限元仿真软件comsol multiphysics对该复合绝缘子模型在没有表面电荷积聚、表面积聚负极性电荷以及表面积聚正极性电荷的情况下电场分布情况进行了仿真分析。采用PIC/MCC仿真模型对大气环境下复合绝缘子气体放电过程进行模拟分析。仿真模型中通过有限元法计算放电空间的电场分布，同时通过耦合泊松方程以解决空间电荷对电场的畸变影响。实现了二维空间大气环境下复合绝缘子气体放电过程的动态模拟，并且在仿真模拟过程中充分考虑了电子与大气分子之间的弹性碰撞、激励碰撞以及电离碰撞等过程。实验测量了在施加高压直流条件下，复合绝缘子表面电荷的积聚情况，并且对比分析了仿真结果与实验结果的相同点以及不同点。本文的仿真结果能够较好地解释大气环境中复合绝缘子气体放电的过程，并且能够清晰地描述在放电过程中不同时刻各种带电粒子的分布情况以及气体放电产生的电荷在复合绝缘子表面形成表面电荷积聚的动态过程，为进一步开展该类气体放电机制的研究提供了重要的理论支持。
[Abstract]:Composite insulator has become the main carrier of high voltage transmission because of its excellent anti-pollution flashover performance. The existence of surface charge will lead to the decrease of flashover voltage along the surface of composite insulator. Therefore, it is of great significance to study the mechanism of surface charge accumulation of composite insulator for improving the insulation performance of composite insulator under the condition of HVDC. The main contents of this paper include the establishment of composite insulator model and the simulation analysis of the influence of surface charge accumulation on the electric field distribution of the model. Secondly, the gas discharge process of composite insulator in atmospheric environment is simulated. Finally, the simulation results are verified in order to better understand the mechanism of charge accumulation on the surface of composite insulators and provide necessary theoretical support for the design of composite insulators. According to the size of FXBW6-10/70 composite insulator, the corresponding composite insulator model is established in this paper. The finite element simulation software comsol multiphysics is used to simulate the electric field distribution of the composite insulator model without surface charge accumulation, surface negative charge accumulation and surface positive charge accumulation. The PIC/MCC simulation model is used to simulate and analyze the gas discharge process of composite insulator in atmospheric environment. In the simulation model, the electric field distribution in discharge space is calculated by finite element method, and the influence of space charge on electric field distortion is solved by coupling Poisson equation. The dynamic simulation of gas discharge process of composite insulator in two-dimensional atmosphere environment is realized. The elastic collision, excitation collision and ionization collision between electrons and atmospheric molecules are fully considered in the simulation process. The surface charge accumulation of composite insulator is measured under the condition of HVDC, and the similarities and differences between the simulation results and the experimental results are compared and analyzed. The simulation results in this paper can explain the discharge process of composite insulator gas in atmospheric environment. And it can clearly describe the distribution of various charged particles at different times during the discharge and the dynamic process of charge accumulation on the surface of composite insulator formed by the charge generated by gas discharge. It provides important theoretical support for further research on the discharge mechanism of this kind of gas.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM216

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