半波长输电线路潜供电弧多场耦合的动力学建模研究
发布时间：2018-10-23 07:42
【摘要】：综合考虑半波长输电线路潜供电弧所受电磁力、热浮力、风载荷和空气阻力的多场耦合作用,并纳入链式电弧模型,建立了潜供电弧的受力方程和运动模型。通过深入分析弧根的形成与运动机制,建立了潜供电弧的弧根模型,并提出电流元长度的最优选取方法。开展了半波长潜供电弧的物理模拟实验,并将仿真结果与实验结果进行对比,验证了所建仿真模型的有效性。通过比较不同潜供电流、风速和风向下潜供电弧的运动轨迹与自熄时间,分析了风载荷、热浮力与电磁力对电弧的作用机制,表明所建电弧模型能有效计及风载荷对潜供电弧运动与自熄特性的影响。基于仿真分析,获得了不同起弧位置的电弧运动轨迹与自熄时间,指出在电极始端起弧时潜供电弧的自熄时间更长,较难熄灭。仿真结果再现了潜供电弧向电极末端运动过程中上弧根的跳跃现象,这可合理解释实验中上弧根位置与弧柱比较接近而落后于下弧根的情形。
[Abstract]:Considering the coupling effect of electromagnetic force, thermal buoyancy, wind load and air resistance on the submersible arc of half-wavelength transmission line, the force equation and motion model of the submersible arc are established by incorporating the chain arc model. By analyzing the formation and motion mechanism of arc root, the arc root model of submersible arc is established, and the optimal selection method of current element length is put forward. The physical simulation experiment of half-wavelength submersible arc is carried out, and the validity of the simulation model is verified by comparing the simulation results with the experimental results. The action mechanism of wind load, thermal buoyancy and electromagnetic force on arc is analyzed by comparing the trajectory and self-extinguishing time of submersible arc with different potential current, wind speed and wind direction. It is shown that the arc model can effectively take into account the effect of wind load on the motion and self-extinguishing characteristics of submersible arc. Based on the simulation analysis, the arc trajectory and the self-extinguishing time of arc with different starting positions are obtained. It is pointed out that the self-extinguishing time of submersible arc is longer and it is more difficult to extinguish when the arc starts at the beginning of the electrode. The simulation results reappear the jump phenomenon of the upper arc root in the process of the arc moving towards the electrode end, which can reasonably explain that the position of the upper arc root is close to the arc column and lags behind the lower arc root in the experiment.
【作者单位】： 新能源电力系统国家重点实验室(华北电力大学);山东大学电气工程学院;中国电力科学研究院;
【基金】：国家自然科学基金项目(51277061,51420105011) 国家电网公司科技项目(GY71-14-032)~~
【分类号】：TM751
[Abstract]:Considering the coupling effect of electromagnetic force, thermal buoyancy, wind load and air resistance on the submersible arc of half-wavelength transmission line, the force equation and motion model of the submersible arc are established by incorporating the chain arc model. By analyzing the formation and motion mechanism of arc root, the arc root model of submersible arc is established, and the optimal selection method of current element length is put forward. The physical simulation experiment of half-wavelength submersible arc is carried out, and the validity of the simulation model is verified by comparing the simulation results with the experimental results. The action mechanism of wind load, thermal buoyancy and electromagnetic force on arc is analyzed by comparing the trajectory and self-extinguishing time of submersible arc with different potential current, wind speed and wind direction. It is shown that the arc model can effectively take into account the effect of wind load on the motion and self-extinguishing characteristics of submersible arc. Based on the simulation analysis, the arc trajectory and the self-extinguishing time of arc with different starting positions are obtained. It is pointed out that the self-extinguishing time of submersible arc is longer and it is more difficult to extinguish when the arc starts at the beginning of the electrode. The simulation results reappear the jump phenomenon of the upper arc root in the process of the arc moving towards the electrode end, which can reasonably explain that the position of the upper arc root is close to the arc column and lags behind the lower arc root in the experiment.
【作者单位】： 新能源电力系统国家重点实验室(华北电力大学);山东大学电气工程学院;中国电力科学研究院;
【基金】：国家自然科学基金项目(51277061,51420105011) 国家电网公司科技项目(GY71-14-032)~~
【分类号】：TM751
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