操作沖擊下空間電荷對(duì)間隙放電的影響
發(fā)布時(shí)間：2019-05-09 07:53
【摘要】：繞擊是造成超特高壓輸電線路雷擊跳閘的主要原因,很多學(xué)者認(rèn)為空間電荷是造成繞擊事故的原因之一。為深入研究空間電荷對(duì)雷電放電的影響,本文搭建了100cm板-針間隙,對(duì)其施加正、負(fù)極性操作沖擊電壓,采用高速攝像系統(tǒng)對(duì)放電發(fā)展過程進(jìn)行觀測(cè)。為定量分析空間電荷對(duì)放電發(fā)展的影響,測(cè)量了正板-針間隙預(yù)放電電流,通過提取電荷電流,并對(duì)其積分得到空間電荷量的大小。試驗(yàn)結(jié)果發(fā)現(xiàn):正、負(fù)極性操作電壓下,放電發(fā)展都是由正極性電極指向負(fù)極性電極;正極性操作沖擊電壓下,放電擊中點(diǎn)在針電極頭部的概率隨著針頭部曲率半徑的增大而增大。在相同的試驗(yàn)條件下,板-尖頭針間隙的空間電荷量最大,隨著針電極頭部曲率半徑逐漸增大,空間電荷量逐漸變小。
[Abstract]:Bypass is the main cause of lightning tripping in ultra-high voltage transmission lines. Many scholars believe that space charge is one of the causes of bypass accidents. In order to study the effect of space charge on lightning discharge, a 100 cm plate-needle gap was set up in this paper, and the impulse voltage was applied to it with positive and negative polarity operation. A high-speed camera system was used to observe the discharge development process. In order to quantitatively analyze the effect of space charge on the development of discharge, the pre-discharge current between positive plate and needle was measured. The charge current was extracted and the amount of space charge was obtained by integrating it. The results show that: under the positive and negative operating voltage, the discharge development is directed from the positive electrode to the negative electrode; Under the positive polarity operating impulse voltage, the probability of the discharge hitting point at the tip of the needle electrode increases with the increase of the radius of curvature of the needle head. Under the same test conditions, the space charge of the plate-needle gap is the largest, and the space charge becomes smaller with the increase of the curvature radius of the needle electrode head.
【作者單位】： 華北電力大學(xué)高電壓與電磁兼容北京市重點(diǎn)實(shí)驗(yàn)室;華北電力大學(xué)新能源電力系統(tǒng)國(guó)家重點(diǎn)實(shí)驗(yàn)室;國(guó)家電網(wǎng)公司交流建設(shè)分公司;萊蕪供電公司;城市建設(shè)研究院;
【分類號(hào)】：TM83
[Abstract]:Bypass is the main cause of lightning tripping in ultra-high voltage transmission lines. Many scholars believe that space charge is one of the causes of bypass accidents. In order to study the effect of space charge on lightning discharge, a 100 cm plate-needle gap was set up in this paper, and the impulse voltage was applied to it with positive and negative polarity operation. A high-speed camera system was used to observe the discharge development process. In order to quantitatively analyze the effect of space charge on the development of discharge, the pre-discharge current between positive plate and needle was measured. The charge current was extracted and the amount of space charge was obtained by integrating it. The results show that: under the positive and negative operating voltage, the discharge development is directed from the positive electrode to the negative electrode; Under the positive polarity operating impulse voltage, the probability of the discharge hitting point at the tip of the needle electrode increases with the increase of the radius of curvature of the needle head. Under the same test conditions, the space charge of the plate-needle gap is the largest, and the space charge becomes smaller with the increase of the curvature radius of the needle electrode head.
【作者單位】： 華北電力大學(xué)高電壓與電磁兼容北京市重點(diǎn)實(shí)驗(yàn)室;華北電力大學(xué)新能源電力系統(tǒng)國(guó)家重點(diǎn)實(shí)驗(yàn)室;國(guó)家電網(wǎng)公司交流建設(shè)分公司;萊蕪供電公司;城市建設(shè)研究院;
【分類號(hào)】：TM83
【參考文獻(xiàn)】
相關(guān)期刊論文 前9條
1 廖蔚明;崔國(guó)華;孫昭英;李成榕;;±800kV直流線路桿塔塔頭空氣間隙的直流疊加操作沖擊放電特性[J];電網(wǎng)技術(shù);2008年09期
2 曾嶸;耿屹楠;牛r，
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