本文關(guān)鍵詞： 山火 輸電導(dǎo)線 拉伸強度 載流量 溫度場　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：輸電線路是電網(wǎng)輸送電能的重要設(shè)備。近年來,我國電網(wǎng)輸電線路山火頻發(fā),嚴重危害輸電線路的安全運行。因此,對山火后輸電線路導(dǎo)線的力學(xué)和電學(xué)性能研究顯得尤為重要。本文以常用的架空輸電導(dǎo)線(鋼芯鋁絞線)為研究對象,用山火模擬實驗研究了溫度對導(dǎo)線拉伸強度和載流量的影響;用有限元仿真分析了山火發(fā)生時導(dǎo)線的總長度、最大弧垂以及應(yīng)力的變化。主要研究內(nèi)容如下:(1)以薪柴火燒烤導(dǎo)線和管式電阻爐烘烤導(dǎo)線模擬山火燒導(dǎo)線,研究了溫度對導(dǎo)線拉伸強度的影響。結(jié)果表明:柴火燒烤后,隨著火燒程度的增加,整根導(dǎo)線或單絲導(dǎo)線的最大拉斷力逐漸減小。管式電阻爐烘烤后,單絲鋁線和鋼芯的最大拉斷力均隨著烘烤溫度的升高而減小;單絲鋁線伸長率隨著溫度的升高而增大,單絲鋼芯的伸長率隨著溫度的升高而減小。真實山火后導(dǎo)線的拉斷力實驗中,得出真實山火對導(dǎo)線外層的拉伸強度影響比較大,對中層和內(nèi)層基本沒有影響。(2)測量不同溫度烘烤后導(dǎo)線的直流電阻,根據(jù)載流量計算公式,得出導(dǎo)線載流量和加熱溫度的關(guān)系。結(jié)果表明:導(dǎo)線無斷股時,隨著加熱溫度的升高,總體上導(dǎo)線的載流量略微增加,增幅在3%以內(nèi)。在有斷股情況時,經(jīng)不同溫度烘烤后的導(dǎo)線,在斷股數(shù)相同時,載流量降低的百分比相同。(3)用ANSYS-CFX模擬山火火場,得出山火發(fā)生時導(dǎo)線上的溫度場,繼而計算得出山火發(fā)生時導(dǎo)線總長度、最大弧垂以及拉應(yīng)力的變化。ABAQUS中在導(dǎo)線上施加同種溫度進行靜力分析,得出導(dǎo)線的總長度、最大弧垂、應(yīng)力等參數(shù)隨著溫度的變化規(guī)律。結(jié)果表明:對于檔距一定的導(dǎo)線,山火發(fā)生時,導(dǎo)線總長度、最大弧垂隨溫度的增加而增大,最低點拉應(yīng)力隨溫度的增加而減小。以上結(jié)論為判斷山火后導(dǎo)線能否繼續(xù)正常運行提供了實驗與分析參考依據(jù)。
[Abstract]:Transmission line is an important equipment for electric power transmission in power grid. In recent years, the mountain fire of power transmission line in our country is frequently occurring, which seriously endangers the safe operation of transmission line. It is very important to study the mechanical and electrical properties of transmission lines after hill fire. In this paper, the commonly used overhead transmission lines (steel core aluminum strands) are taken as the research object. The influence of temperature on the tensile strength and load flux of the wire was studied by using the mountain fire simulation experiment, and the total length of the conductor was analyzed by finite element simulation. The main contents of this study are as follows: 1) the effect of temperature on the tensile strength of the wire was studied by using firewood barbecue wire and tube resistance furnace to simulate the mountain fire wire, and the results showed that: after firewood barbecue, the effect of temperature on the tensile strength of the wire was studied. With the increase of burning degree, the maximum tensile force of the whole wire or single wire wire decreases gradually, and the maximum tensile force of aluminum wire and steel core decreases with the increase of baking temperature after baking in tubular resistance furnace. The elongation of monofilament aluminum wire increases with the increase of temperature, and the elongation of steel core decreases with the increase of temperature. The direct current resistance of conductors after baking at different temperatures is measured. According to the calculation formula of carrier flow, the relationship between lead flux and heating temperature is obtained. The results show that the conductors have no broken strands. With the increase of heating temperature, the overall carrying capacity of the wire increases slightly, with an increase of less than 3%. In the case of broken strands, the conductors baked at different temperatures have the same number of broken shares, Using ANSYS-CFX to simulate the fire field, the temperature field on the wire when the mountain fire occurs, and then calculate the total length of the wire when the mountain fire occurs. The variation of maximum sag and tensile stress. The static analysis of the same temperature applied in Abaqus shows that the total length, maximum sag, stress and other parameters of the wire vary with the temperature. The results show that: for the wire with a certain distance, When a hill fire occurs, the total length and maximum sag of the wire increase with the increase of temperature, and the lowest tensile stress decreases with the increase of temperature. The above conclusions provide an experimental and analytical reference for judging whether the wire can continue to operate normally after the fire.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM75

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