本文選題：平行導線 + 絕緣護套　； 參考：《武漢大學》2017年碩士論文

【摘要】：近年來,由于輸電線路緊張,緊湊型輸電技術得以廣泛應用,且隨著各種災害性天氣的逐漸增多,輸電線路空氣間隙擊穿事故時常發(fā)生�？諝忾g隙工頻擊穿事故是電網(wǎng)正常運行的重大安全隱患,且線路因空氣間隙工頻擊穿跳閘后重合閘不易成功,嚴重影響了電力系統(tǒng)的安全穩(wěn)定運行,因而造成重大的經(jīng)濟損失。目前國內(nèi)對于高壓輸電線路空氣間隙工頻擊穿的研究涵蓋了風偏、覆冰、降雨、山火、濃霧等影響,涉及了桿塔、絕緣子串、導線及跳線的相關擊穿理論、模型及試驗,但鮮有采用新型導線絕緣涂料及護層防高壓輸電線路空氣間隙工頻擊穿的相關技術。針對上述情況,本文提出了導線包覆絕緣護套以提升空氣間隙工頻擊穿電壓的研究思路,設計了平行導線包覆絕緣護套的試驗模型,分別采用了不同絕緣護套和不同包覆方式進行了工頻擊穿試驗,記錄了導線包覆絕緣護套時工頻擊穿現(xiàn)象,對比分析了導線包覆絕緣護套對提升空氣間隙工頻擊穿電壓的效果。本文采用了四種不同的絕緣護套材料,為對這四種不同絕緣護套材料的電氣特性進行探討,分別對其進行了電氣強度測試。為方便觀察導線包覆絕緣護套后擊穿電壓的提升效果,本文先對裸導線進行了工頻擊穿試驗,研究了裸導線工頻擊穿電壓與導線間距的關系,試驗結果表明,其電壓隨著導線線間最小距離的增大而近乎線性增大,且隨著導線間距的不斷增大,其平均擊穿場強有所減小。本文通過裸導線包覆絕緣護套工頻擊穿試驗,分別研究了單根導線包覆絕緣護套和雙根導線包覆絕緣護套,以及導線涂覆絕緣涂料等情況,對線間絕緣特性的提升效果,并從安全距離角度對比分析了導線不同包覆方式對提升導線線間工頻擊穿電壓的效果。本文利用COMSOL軟件對短間隙距離情況下導線的工頻擊穿場強進行了仿真計算,并從場強角度分析了雙根導線包覆絕緣護套對裸導線空氣間隙擊穿電壓的提升原因。此外,還結合試驗中的滑閃現(xiàn)象,根據(jù)導線包覆護套方式及結構,利用鏈形等值回路表示導線包覆絕緣護套模型,解釋了平行導線包覆絕緣護層沿面滑閃原因。
[Abstract]:In recent years, because of the shortage of transmission lines, compact transmission technology has been widely used, and with the increasing of disastrous weather, the breakdown accidents of air gap in transmission lines often occur. The air gap power frequency breakdown accident is a major safety hazard in the normal operation of the power grid. Because of the air gap power frequency breakdown and tripping, the reclosing is not easy to succeed, which seriously affects the safe and stable operation of the power system, resulting in significant economic losses. The current domestic research on the power frequency breakdown of air gap in HV transmission lines covers the effects of wind deviation, icing, rainfall, hill fire, dense fog, and so on. It involves the relevant breakdown theory, model and test of pole tower, insulator string, conductor and jumper. However, there are few related technologies of new conductor insulation coating and protective layer against air gap breakdown of high voltage transmission lines. In view of the above situation, this paper puts forward the research idea of conductor coating insulation sheath to increase the power frequency breakdown voltage of air gap, and designs the test model of parallel conductor coating insulation sheath. The power frequency breakdown test was carried out by using different insulation sheaths and different coating methods respectively. The power frequency breakdown phenomenon of conductor coating insulation sheath was recorded, and the effect of wire coating insulation sheath on increasing the power frequency breakdown voltage of air gap was compared and analyzed. In this paper, four kinds of insulating and sheathed materials are used to study the electrical characteristics of these four kinds of insulating sheathing materials, and the electrical strength of these four kinds of insulating sheathing materials are tested respectively. In order to observe the improvement effect of breakdown voltage after the conductor is coated with insulation and sheath, this paper first carried out the power frequency breakdown test of bare wire, and studied the relationship between the power frequency breakdown voltage and the distance between the bare wire and the wire. The test results show that, The voltage increases linearly with the minimum distance between wires, and decreases with the increase of wire spacing. In this paper, through the power frequency breakdown test of bare wire coated insulation sheath, the effects of single wire coating insulation sheath and double wire coating insulation sheath, and wire coating insulation coating on the improvement of insulation characteristics between wires are studied, respectively. From the angle of safe distance, the effect of different coating methods on the power frequency breakdown voltage between hoisting wires is analyzed. In this paper, the power frequency breakdown field strength of conductors with short gap distance is simulated and calculated by COMSOL software, and the reason for lifting the breakdown voltage of air gap between bare conductors is analyzed from the point of view of field strength. In addition, according to the sheathing mode and structure of conductor coating, the model of conductor coating insulation sheath is represented by chain equivalent circuit, and the reason of parallel wire coating insulation sheath sliding along the surface is explained.
【學位授予單位】：武漢大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75;TM21

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