本文選題：復(fù)合絕緣子 + 表面電荷��； 參考：《湖南大學(xué)》2014年碩士論文

【摘要】：復(fù)合絕緣子由于其優(yōu)異的防污閃性能，，已成為高壓輸電外絕緣的主要載體。表面電荷的存在會導(dǎo)致復(fù)合絕緣子沿面閃絡(luò)電壓的下降，因此研究在高壓直流情況下，復(fù)合絕緣子表面電荷積聚機理對于提高復(fù)合絕緣子的絕緣性能具有重要的意義。本文主要的研究內(nèi)容包括建立復(fù)合絕緣子模型，并仿真分析表面電荷積聚對該模型電場分布的影響。其次，針對大氣環(huán)境下復(fù)合絕緣子氣體放電過程進行了仿真模擬。最后實驗驗證仿真模擬結(jié)果，以期能夠更加深刻地理解復(fù)合絕緣子表面電荷的積聚機理，進而為復(fù)合絕緣子的設(shè)計提供必要的理論支持。 本文根據(jù)型號為FXBW6-10/70的復(fù)合絕緣子尺寸，建立了對應(yīng)的復(fù)合絕緣子模型。使用有限元仿真軟件comsol multiphysics對該復(fù)合絕緣子模型在沒有表面電荷積聚、表面積聚負極性電荷以及表面積聚正極性電荷的情況下電場分布情況進行了仿真分析。 采用PIC/MCC仿真模型對大氣環(huán)境下復(fù)合絕緣子氣體放電過程進行模擬分析。仿真模型中通過有限元法計算放電空間的電場分布，同時通過耦合泊松方程以解決空間電荷對電場的畸變影響。實現(xiàn)了二維空間大氣環(huán)境下復(fù)合絕緣子氣體放電過程的動態(tài)模擬，并且在仿真模擬過程中充分考慮了電子與大氣分子之間的彈性碰撞、激勵碰撞以及電離碰撞等過程。 實驗測量了在施加高壓直流條件下，復(fù)合絕緣子表面電荷的積聚情況，并且對比分析了仿真結(jié)果與實驗結(jié)果的相同點以及不同點。 本文的仿真結(jié)果能夠較好地解釋大氣環(huán)境中復(fù)合絕緣子氣體放電的過程，并且能夠清晰地描述在放電過程中不同時刻各種帶電粒子的分布情況以及氣體放電產(chǎn)生的電荷在復(fù)合絕緣子表面形成表面電荷積聚的動態(tài)過程，為進一步開展該類氣體放電機制的研究提供了重要的理論支持。
[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.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM216

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本文編號：1840257