本文關(guān)鍵詞：直流GIL中金屬微粒對絕緣子表面電荷積聚的作用機(jī)制研究　出處：《華北電力大學(xué)(北京)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 直流GIL 電荷積聚 金屬微粒 微觀機(jī)制 電荷測量平臺

【摘要】：氣體絕緣金屬封閉輸電線路GIL (Gas Insulated Transmission)適用于傳統(tǒng)直流架空線路受制約的區(qū)域,在未來全球能源互聯(lián)網(wǎng)建設(shè)中具有廣闊的應(yīng)用前景。而對于直流GIL,金屬微粒及表面電荷積聚是引起其絕緣強(qiáng)度劣化的主要因素,且當(dāng)金屬微粒與表面電荷共同作用時,將對直流絕緣體系形成巨大的威脅。本文針對直流GIL中導(dǎo)電微粒污染問題,研究其對絕緣子表面電荷積聚的影響：首先基于麥克斯韋方程組,對絕緣子表面電荷的積聚情況進(jìn)行分析,并進(jìn)-步納入微粒污染以及氣體側(cè)空間離子的產(chǎn)生、復(fù)合、遷移、擴(kuò)散等作用,利用多物理場仿真軟件COMSOL建立絕緣子表面電荷積聚的微觀模型,分析了直流電壓下絕緣子模型表面電荷積聚的時間效應(yīng)及電壓特性,并深入探究微粒對表面電荷積聚效應(yīng)的影響；另一方面,為驗(yàn)證仿真分析的正確性,建立考慮金屬微粒影響的旋轉(zhuǎn)式電荷測量實(shí)驗(yàn)平臺,并對應(yīng)仿真分析分別針對電荷積聚的時間效應(yīng)和電壓特性以及微粒尺寸和微粒附著位置對電荷積聚的影響幾個方面進(jìn)行實(shí)驗(yàn)研究,從實(shí)驗(yàn)的角度揭示表面電荷和金屬微粒對直流GIL絕緣強(qiáng)度的劣化作用；進(jìn)一步以實(shí)體建模方式建立直流GIL中包含微粒污染的絕緣子表面電荷積聚模型,分析柱式和盆式絕緣子表面電荷的分布規(guī)律,并針對金屬微粒在GIL中“附著”與“懸浮”兩種主要存在形式,深入探究附著微粒和懸浮微粒對柱式絕緣子表面電荷積聚的影響。簡化模型的仿真分析和實(shí)驗(yàn)結(jié)果表明：考慮金屬微粒影響的電荷仿真模型與實(shí)驗(yàn)值相吻合,驗(yàn)證了仿真模型的可靠性。進(jìn)一步,實(shí)體建模中金屬微粒對絕緣子表面電荷積聚的影響主要表現(xiàn)為：絕緣子表面電荷積聚與絕緣子表面場強(qiáng)的法向分量具有一致性；附著絕緣子表面的導(dǎo)電微粒能引起表面電荷積聚激增,其中附著在中間部位的微粒引起的電荷激增量更為顯著,且微粒兩端積聚電荷的電性相反,并與微粒尖端所對電極極性相反；懸浮微粒對表面電荷積聚的影響較小,當(dāng)懸浮微粒距絕緣子表面垂直距離超過4倍微粒直徑時,其對絕緣子表面電荷的影響可以忽略。本文研究結(jié)論有利于深化對直流GIL中沿面閃絡(luò)故障和微粒引起氣隙擊穿的機(jī)理認(rèn)識,并為直流GIL中絕緣子結(jié)構(gòu)設(shè)計和金屬微粒污染物的無害化措施提供一定的理論指導(dǎo)。
[Abstract]:Gas insulated transmission line GIL (Gas Insulated Transmission) is suitable for the traditional DC overhead line is restricted by the region, has broad application prospect in the future construction of the global energy Internet. For DC GIL, metal particles and surface charge accumulation is the main factors of the insulation strength deterioration, and when the interaction of metal the particle and surface charge, the DC insulation system formed a huge threat. Aiming at the pollution problem of conductive particles in DC GIL, to study its effect on insulator surface charge accumulation: firstly, based on the Maxwell equations, analysis of insulator surface charge accumulation, and further into the particulate and gas side space ion production of composite, migration, diffusion, microscopic model of insulator surface charge accumulation by using multi physics simulation software COMSOL, divided The effect of time under DC voltage of insulator surface charge accumulation model and voltage characteristic analysis, and explore the effect of particles on the surface charge accumulation effect; on the other hand, in order to verify the correctness of the analysis simulation, establishment of rotary charge measurement considering the metal particles impact experiment platform, and the corresponding simulation analysis of time effect for charge respectively. The accumulation and voltage characteristics as well as the particle size and particle attachment location effect on charge accumulation in several aspects of experimental research, revealing the surface charge and metal particles insulation deterioration effect strength of DC GIL from the experimental point of view; further insulator surface charge accumulation model containing particulate pollution in DC GIL based on solid modeling, analysis distribution of the column and the insulator surface charge, and the metal particles in GIL "attachment" and "suspended" two main To form, in-depth exploration of the adhesion of particles and suspended particles on the post insulator surface charge accumulation. The simplified simulation analysis and experimental results show that the model considering the charge simulation model and experimental effects of metal particles are consistent with the values, verify the reliability of the simulation model. Further, the influence of metal particles on insulator surface charge in solid modeling the main performance is: the accumulation of insulator surface charge accumulation and insulator surface field normal component is consistent; attachment of conductive particles on the surface of the insulator can cause surface charge accumulation in charge the adhesion of particles in the middle position caused by the surge in the amount is more significant, and electrically charged particles are accumulated instead, and particles the tip of the electrode of opposite polarity; suspended particles has little effect on the surface charge accumulation, when the suspended particles from the vertical surface of the insulator When the particle diameter is 4 times more than the distance, its impact on the insulator surface charge can be ignored. The conclusion of this study is conducive to deepening the mechanism of DC GIL along surface flashover fault and particles caused by air gap breakdown, provide certain theoretical guidance and harmless measures of pollutants for insulator and metal particles in DC GIL design sewage.

【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TM216;TM75

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本文編號：1375959