空间颗粒物在直流输电线路下的运动特性

Motion Characteristics of Space Particles Under HVDC Transmission Line

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。

The existence of space particles affects the corona discharge current and the electric field on the ground under the high voltage transmission lines to some extent. By researching the motion characteristics of space particle, we can not only know more about its influence to the corona characteristics, but also offer important references to engineering problems. On the basis of the simulation model of transmission line electric field, we put forward a motion model of charged space particles under the transmission line, and simulate the model by MATLAB to get the motion characteristics of different space particles and the influence of line voltage, particle diameter, original position, and relative dielectric constant on the motion characteristics. The results show that particle diameter influences more to the motion characteristics than its relative dielectric constant. The motion track, motion time, and change of motion speed depend more on the particle diameter. Nanometer particles and hundred micron particles are harder to reach the surface of the transmission lines than micron particles. The research will offer references for the design and construction of direct current engineering in the future.