【摘要】：明確直流氣體絕緣金屬封閉輸電線路(gas insulated transmission line,GIL)不均勻場中金屬微粒運動及其引發(fā)的間隙放電具有重要意義。建立了微粒運動的三維電-力學瞬態(tài)耦合有限元數(shù)值計算模型:基于靜電場原理,獲得了微粒的電荷量及電場力;結(jié)合力學方程與拉普拉斯光順方法給出了運動的動網(wǎng)格模型;為抑制微粒與壁面接觸時網(wǎng)格拓撲改變引起的計算失敗,提出了虛擬接觸壁面條件。對楔形平板電極中典型的微粒運動進行數(shù)值模擬,通過實驗驗證了計算模型的準確性。獲得了微粒表面的場強畸變,并根據(jù)流注起始判據(jù)對其引發(fā)的典型間隙放電形式進行分析,結(jié)果表明:微粒向電極運動時,表面場強畸變最嚴重部位總是分布在靠近電極一側(cè)的頂端;微粒緊鄰高(低)壓電極而與低(高)壓電極的放電由微放電引起;起跳階段與高壓電極的放電可能會立即引發(fā)整個間隙擊穿。
[Abstract]:It is of great significance to determine the movement of metal particles and the gap discharge induced by metal particles in the nonuniform field of (gas insulated transmission line Gil (DC gas insulated metal enclosed transmission line). Based on the principle of electrostatic field, the electric charge and electric force of particles are obtained, and the dynamic mesh model of motion is given by combining mechanical equation and Laplacian smoothing method. In order to suppress the computational failure caused by the mesh topology change in the contact of particles with the wall, the virtual contact wall condition is proposed. The numerical simulation of the typical particle motion in a wedge plate electrode is carried out, and the accuracy of the model is verified by experiments. The field intensity distortion of the particle surface is obtained, and the typical gap discharge patterns caused by the particle surface are analyzed according to the flow initiation criterion. The results show that when the particle moves to the electrode, The most serious surface field intensity distortion is always located near the top of the electrode side, and the discharge of the particles close to the high (low) piezoelectric electrode and the low (high) voltage electrode is caused by the microdischarge. The discharge of the take-off phase and the high voltage electrode may cause the entire gap to break down immediately.
【作者單位】： 新能源與電力系統(tǒng)國家重點實驗室(華北電力大學);中國電力科學研究院;河北省輸變電設(shè)備安全防御重點實驗室(華北電力大學);
【基金】：國家電網(wǎng)公司科技項目“特高壓GIL微粒輸運特性及控制技術(shù)研究” 河北省自然科學基金面上項目(E2015502081)~~
【分類號】：TM75

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