發(fā)布時間：2018-10-24 21:03

【摘要】：本文以糯扎渡電站送電廣東±800kV直流輸電工程的普洱換流站接地極線路為對象,主要研究不同因素對直流電弧特性的影響、直流接地極招弧角安裝方式以及招弧角與直流接地極線路的絕緣配合方法。論文首先調(diào)研和總結(jié)了直流電弧特性和招弧角理論和工程應(yīng)用的研究現(xiàn)狀,直流接地極招弧角熄弧能力除了受到電磁力、熱浮力、風(fēng)力等因素影響之外,主要與招弧角的安裝方式、間隙距離以及系統(tǒng)容量相關(guān)。結(jié)合實際直流接地極線路參數(shù),建立直流接地極招弧角燃弧試驗平臺,對影響電弧特性的不同因素如電磁力、風(fēng)力和招弧角形式及布置方式,開展了招弧角燃弧試驗研究,通過高速攝像機(jī)記錄電弧發(fā)展過程。研究結(jié)果表明:電磁力對電弧的轉(zhuǎn)移和拉伸作用顯著,相對而言,由于受到脈寬等因素限制,風(fēng)速和熱浮力作用不明顯;最小放電間隙距離同為400mm時,羊角型招弧角電弧最終拉伸至約1400mm,而其他類型招弧角僅拉伸至1100~1200mm,表明羊角型招弧角的電弧拉伸能力最強(qiáng),最有利于電弧的熄滅。結(jié)合招弧角電弧電磁力的計算,研究招弧角安裝方式,分析安裝(角度)方式、故障位置和桿塔接地電阻對電磁力的影響規(guī)律,并給出了招弧角安裝方式的建議。研究結(jié)果表明:當(dāng)招弧角平行于輸電線路安裝、且朝向接地極側(cè)時(α=0°),電弧受到的電磁力最大,電弧最易遠(yuǎn)離絕緣子串;當(dāng)故障點位置靠近接地極側(cè),桿塔接地電阻增大時,電弧電流減小,電弧受到的電磁力減弱。最后,通過招弧角間隙燃弧試驗獲取電弧伏安特性曲線,并與直流輸電系統(tǒng)輸出特性曲線相結(jié)合,提出招弧角與直流輸電線路的絕緣配合方法,基于該方法給出不同招弧角間隙距離對應(yīng)直流輸電線路的保護(hù)范圍,并提出了提高招弧角保護(hù)范圍的建議。研究結(jié)果表明:對于一定間隙距離的招弧角而言,隨著桿塔接地電阻的增大,線路的保護(hù)范圍變大。不考慮電弧拉長,當(dāng)間隙距離為650mm時,若桿塔接地電阻Rt=5Ω,保護(hù)范圍約為5%;若桿塔接地電阻Rt=15Ω,保護(hù)范圍略約為20%。此外,增加接地極導(dǎo)線回數(shù)可提高招弧角保護(hù)范圍。取桿塔接地電阻Rt=5Ω,對1000mm間隙的招弧角,當(dāng)接地極導(dǎo)線回數(shù)由2提高到6時,其保護(hù)范圍由5%至12%,提升約2倍,改善效果顯著。
[Abstract]:In this paper, the earth pole line of Pu'er converter station in Guangdong 鹵800kV DC transmission project of Nuozhadu Hydropower Station is taken as the object, and the influence of different factors on DC arc characteristics is studied. The installation method of DC earth contact arc angle and the method of insulation coordination between DC earth contact angle and DC earth pole line. In this paper, the characteristics of DC arc and the theory and engineering application of DC arc angle are investigated and summarized. Besides electromagnetic force, thermal buoyancy, wind force and so on, the DC earth contact arc extinguishing ability is affected by the factors, such as electromagnetic force, thermal buoyancy, wind force and so on. It is mainly related to the installation method, gap distance and system capacity. Combined with the actual DC ground pole line parameters, the test platform of DC earth pole arc firing angle is established. The experimental research on the different factors such as electromagnetic force, wind force, arc angle form and arrangement mode is carried out for the influence of arc characteristics. The arc development is recorded by a high-speed camera. The results show that the effect of electromagnetic force on arc transfer and tension is significant, but the effect of wind speed and thermal buoyancy is not obvious because of the limitation of pulse width, and the minimum discharge gap distance is the same as 400mm. Finally, the arc of angle-type arc is drawn to about 1400mm, while the other type of arc angle is only stretched to 1100m ~ 1200mm, which indicates that the arc drawing ability of angle-type arc angle is the strongest, which is most favorable to the extinction of arc. Combined with the calculation of the electromagnetic force of the arc, this paper studies the installation mode of the arc angle, analyzes the influence of the installation (angle) mode, the fault location and the grounding resistance of the tower on the electromagnetic force, and gives some suggestions for the installation mode of the arc stroke angle. The results show that when the arc angle is parallel to the transmission line and is oriented towards the earth-pole side (偽 = 0 擄), the arc is subjected to the largest electromagnetic force, and the arc is most easily away from the insulator string, and when the fault point is near the ground pole side, the grounding resistance of the tower increases. The current of the arc decreases and the electromagnetic force of the arc decreases. Finally, the arc volt-ampere characteristic curve is obtained by the arc firing test at the angle of stroke, and combined with the output characteristic curve of HVDC transmission system, and the insulation coordination method between the arc stroke angle and the HVDC transmission line is put forward. Based on this method, the protection range of HVDC transmission line corresponding to the gap distance of different arc stroke angle is given, and some suggestions to improve the protection range are put forward. The results show that the range of line protection becomes larger with the increase of the grounding resistance of the tower for the arc angle of a certain gap distance. When the gap distance is 650mm, the protection range is about 5 if the grounding resistance of the tower is Rt=5 惟, and about 20 if the grounding resistance of the tower is Rt=15 惟. In addition, the range of arc angle protection can be increased by increasing the number of earth pole conductors. When the grounding resistance Rt=5 惟 of the pole tower is taken, when the arc contact angle of the 1000mm gap is increased from 2 to 6, the protection range is from 5% to 12%, which is about 2 times higher, and the improvement effect is remarkable.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM721.1

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