直流氣體絕緣線路中自由金屬微粒的局部放電特性與影響因素
本文關(guān)鍵詞: 直流GIL 同軸圓柱電極 線形微粒 局部放電信號(hào) 運(yùn)動(dòng)特性 飛螢現(xiàn)象 出處:《高電壓技術(shù)》2017年02期 論文類型:期刊論文
【摘要】:直流氣體絕緣線路(GIL)中的自由金屬微粒會(huì)使電場(chǎng)發(fā)生畸變,使絕緣氣體/絕緣子發(fā)生局部放電等劣化效應(yīng)。為此,研究了微粒局部放電的影響因素以及嚴(yán)重程度,在密封同軸圓柱腔體內(nèi)充入不同氣壓的SF6氣體,以不同長度的線形微粒進(jìn)行了試驗(yàn),利用脈沖電流法及高速相機(jī)同時(shí)觀察了其局部放電信號(hào)與微粒運(yùn)動(dòng)行為,對(duì)局部放電信號(hào)的平均局部放電量、平均局部放電時(shí)間間隔進(jìn)行了分析。結(jié)果表明:對(duì)于自由線形金屬微粒,微粒的平均局部放電量與長度、最大可能帶電量成正相關(guān),可根據(jù)微粒的局部放電信號(hào)判斷其危險(xiǎn)程度及微粒長度;在負(fù)電壓下,微粒跳起運(yùn)動(dòng)至高壓電極附近,發(fā)生"飛螢"現(xiàn)象;在正電壓下,微粒在外殼地電極跳起后落至地電極,并不斷彈跳;且微粒在負(fù)電壓下的平均局部放電量是在正電壓下的2~5倍,平均局部放電時(shí)間間隔較小;隨著氣壓增大,氣體的平均局部放電量隨之減小,但有趨于飽和的趨勢(shì)。因此,自由金屬微粒的局部放電特性可以為金屬微粒的嚴(yán)重程度判別與故障診斷提供依據(jù)。
[Abstract]:The free metal particles in DC gas insulated line (Gil) will make the electric field distorted and the insulation gas / insulator cause partial discharge degradation effect. The influence factors and severity of particle partial discharge were studied. The SF6 gas with different pressure was filled into the sealed coaxial cylinder cavity, and the experiment was carried out with linear particles of different lengths. The pulse current method and high speed camera were used to observe the PD signal and particle motion simultaneously, and the average partial discharge (PD) of the PD signal was obtained. The average partial discharge time interval is analyzed. The results show that the average partial discharge amount of the particle is positively correlated with the length of the free linear metal particle and the maximum possible charge is positive. The danger degree and particle length can be judged according to the partial discharge signal of the particle. Under the negative voltage, the particles jump up and move to the vicinity of the high voltage electrode, and the phenomenon of "fireflies" occurs. At positive voltage, the particles jump up and fall to the ground electrode, and bounce continuously; The average partial discharge of particles at negative voltage is 2 ~ 5 times of that at positive voltage, and the average partial discharge time interval is smaller. With the increase of gas pressure, the average partial discharge of gas decreases, but tends to saturation. The partial discharge characteristics of free metal particles can be used to judge the severity and fault diagnosis of metal particles.
【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;
【基金】:國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)(2014CB239502)~~
【分類號(hào)】:TM75
【正文快照】: Characteristics of Partial Discharges Caused by Free Metal Particle and InfluencingFactors in DC Gas Insulated LineLI Qingmin,LIU Sihua,WANG Jian,WANG Zhiyuan(Beijing Key Laboratory of High VoltageElectromagnetic Compatibility,North China Electric Power
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