【摘要】：明確直流氣體絕緣金屬封閉輸電線(xiàn)路(gas insulated transmission line,GIL)不均勻場(chǎng)中金屬微粒運(yùn)動(dòng)及其引發(fā)的間隙放電具有重要意義。建立了微粒運(yùn)動(dòng)的三維電-力學(xué)瞬態(tài)耦合有限元數(shù)值計(jì)算模型:基于靜電場(chǎng)原理,獲得了微粒的電荷量及電場(chǎng)力;結(jié)合力學(xué)方程與拉普拉斯光順?lè)椒ńo出了運(yùn)動(dòng)的動(dòng)網(wǎng)格模型;為抑制微粒與壁面接觸時(shí)網(wǎng)格拓?fù)涓淖円鸬挠?jì)算失敗,提出了虛擬接觸壁面條件。對(duì)楔形平板電極中典型的微粒運(yùn)動(dòng)進(jìn)行數(shù)值模擬,通過(guò)實(shí)驗(yàn)驗(yàn)證了計(jì)算模型的準(zhǔn)確性。獲得了微粒表面的場(chǎng)強(qiáng)畸變,并根據(jù)流注起始判據(jù)對(duì)其引發(fā)的典型間隙放電形式進(jìn)行分析,結(jié)果表明:微粒向電極運(yùn)動(dòng)時(shí),表面場(chǎng)強(qiáng)畸變最嚴(yán)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(huì)立即引發(fā)整個(gè)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(guó)家重點(diǎn)實(shí)驗(yàn)室(華北電力大學(xué));中國(guó)電力科學(xué)研究院;河北省輸變電設(shè)備安全防御重點(diǎn)實(shí)驗(yàn)室(華北電力大學(xué));
【基金】：國(guó)家電網(wǎng)公司科技項(xiàng)目“特高壓GIL微粒輸運(yùn)特性及控制技術(shù)研究” 河北省自然科學(xué)基金面上項(xiàng)目(E2015502081)~~
【分類(lèi)號(hào)】：TM75

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