空间颗粒物在直流输电线路下的运动特性

发布时间：2018-05-13 20:34

本文选题：直流输电线路 + 空间颗粒物　；参考：《高电压技术》2017年02期

【摘要】：空气中颗粒物的存在,在一定程度上影响着直流输电线路的电晕电流及地面合成场强。研究空间颗粒物的运动特性,不仅可加深空间颗粒物影响电晕特性的认知,同时对工程应用也有重要的参考作用。在已有输电线路场强分布仿真计算模型的基础上,提出了颗粒物在输电线路下方空间中带电运动的模型假设,并利用MATLAB软件进行仿真计算,获得了不同颗粒物在线路下方空间的运动特性,以及电压、粒径、初始位置、相对介电常数等因素对颗粒物运动特性的影响。计算结果表明:颗粒物的粒径相对于其自身的相对介电常数来说,是更为重要的影响因素,不仅运动轨迹、运动时间受到粒径的影响较大,而且运动速度变化过程受粒径的影响也大于相对介电常数的影响;纳米级小颗粒物以及几百微米级的大颗粒物相对于微米级颗粒物更难以被导线吸附。该工作可为进一步的仿真计算工作以及新时期下直流输电工程的设计与建设提供技术参考。
[Abstract]:The presence of particulate matter in the air affects the corona current and the field strength of DC transmission lines to some extent. The study of the motion characteristics of space particles can not only deepen the cognition of the effect of space particles on corona characteristics, but also play an important role in engineering application. On the basis of the existing simulation model of transmission line field intensity distribution, the model hypothesis of particle moving in the space below transmission line is proposed, and the simulation calculation is carried out by MATLAB software. The effects of voltage, particle size, initial position and relative dielectric constant on the motion characteristics of different particles in the space below the line were obtained. The calculated results show that the particle size is a more important factor than its own relative dielectric constant. Not only the trajectory but also the moving time are greatly affected by the particle size. The change of velocity is more affected by particle size than by the relative dielectric constant, and it is more difficult to adsorb nanoscale small particles and hundreds of micron particles than micron particles. This work can provide a technical reference for the further simulation and calculation work and the design and construction of HVDC transmission project in the new period.
【作者单位】：清华大学深圳研究生院;清华大学电气工程与电子应用技术系;
【分类号】：TM75

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