【摘要】：綜合考慮半波長(zhǎng)輸電線路潛供電弧所受電磁力、熱浮力、風(fēng)載荷和空氣阻力的多場(chǎng)耦合作用,并納入鏈?zhǔn)诫娀∧Ｐ?建立了潛供電弧的受力方程和運(yùn)動(dòng)模型。通過(guò)深入分析弧根的形成與運(yùn)動(dòng)機(jī)制,建立了潛供電弧的弧根模型,并提出電流元長(zhǎng)度的最優(yōu)選取方法。開(kāi)展了半波長(zhǎng)潛供電弧的物理模擬實(shí)驗(yàn),并將仿真結(jié)果與實(shí)驗(yàn)結(jié)果進(jìn)行對(duì)比,驗(yàn)證了所建仿真模型的有效性。通過(guò)比較不同潛供電流、風(fēng)速和風(fēng)向下潛供電弧的運(yùn)動(dòng)軌跡與自熄時(shí)間,分析了風(fēng)載荷、熱浮力與電磁力對(duì)電弧的作用機(jī)制,表明所建電弧模型能有效計(jì)及風(fēng)載荷對(duì)潛供電弧運(yùn)動(dòng)與自熄特性的影響。基于仿真分析,獲得了不同起弧位置的電弧運(yùn)動(dòng)軌跡與自熄時(shí)間,指出在電極始端起弧時(shí)潛供電弧的自熄時(shí)間更長(zhǎng),較難熄滅。仿真結(jié)果再現(xiàn)了潛供電弧向電極末端運(yùn)動(dòng)過(guò)程中上弧根的跳躍現(xiàn)象,這可合理解釋實(shí)驗(yàn)中上弧根位置與弧柱比較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.
【作者單位】： 新能源電力系統(tǒng)國(guó)家重點(diǎn)實(shí)驗(yàn)室(華北電力大學(xué));山東大學(xué)電氣工程學(xué)院;中國(guó)電力科學(xué)研究院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51277061,51420105011) 國(guó)家電網(wǎng)公司科技項(xiàng)目(GY71-14-032)~~
【分類號(hào)】：TM751

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