過渡阻抗對三段式混合線路行波測距算法的影響探討
劉輝 2022/11/8 8:36:58
(泰山科技學(xué)院,山東 泰安 271000)
摘要:行波測距法是現(xiàn)階段輸電線路故障測距的主要方法之一,主要包括單端行波測距法和雙端行波測距法。由于三段式架空線—電纜混合輸電線路的線路結(jié)構(gòu)復(fù)雜,當(dāng)線路發(fā)生故障時(shí)故障暫態(tài)行波特性異常復(fù)雜。文章通過搭建海南聯(lián)網(wǎng)工程的輸電線路模型,模擬線路上同一點(diǎn)發(fā)生相同故障時(shí),故障點(diǎn)經(jīng)不同的故障阻抗接地時(shí)對行波故障測距算法的影響,分析過渡阻抗對行波測距法的影響,并得到相應(yīng)的結(jié)論。
關(guān)鍵詞:行波測距;故障行波;輸電線路;過渡阻抗
中圖分類號:TN915 文獻(xiàn)標(biāo)識碼:A 文章編號:
The Influence of Transition Impedance on Traveling Wave Ranging Algorithm for Three Section Hybrid Transmission Lines
LIU Hui
(Taishan College of Science and Technology, Tai’an Shandong 271000, China)
Abstract: Traveling wave fault location method is one of the main methods of transmission line fault location at present, it mainly includes single terminal traveling wave ranging method and double terminal traveling wave ranging method.Three-section overhead line-cable hybrid transmission line due to the complex line structure, When the line fails, the transient traveling wave characteristics of the fault on it are very complex. In this paper, the transmission line model of the Hainan interconnection project is built. In this paper, when the same fault occurs at the same point on the line, the influence of the fault point on the traveling wave fault location algorithm when the fault point is grounded through different fault impedances is simulated, the influence of the transition impedance on the traveling wave ranging method is analyzed, and the corresponding conclusions are obtained.
Keywords: traveling wave ranging; fault traveling wave; transmission line; transition impedance
0 引言
隨著城市土地資源的緊張和受周圍建筑物的影響,城市輸電線路逐步由以往占地較多的明線架空線路改為電力電纜輸電線路,并隨之出現(xiàn)了很多架空線—電纜混合輸電線路。隨著現(xiàn)代社會(huì)工業(yè)的快速發(fā)展,開發(fā)風(fēng)力資源、利用海上資源以及跨海峽的區(qū)域電網(wǎng)互聯(lián)等技術(shù)不斷提升,使得混合型輸電線路在配電網(wǎng)絡(luò)中得到了廣泛應(yīng)用[1-5]。
對輸電線路的故障點(diǎn)進(jìn)行定位,目的是減輕人工巡檢的壓力。在線路發(fā)生故障后,測距裝置能夠提供準(zhǔn)確、可靠的線路信息,以便分析故障,提高電力系統(tǒng)安全管理水平,減少經(jīng)濟(jì)損失,維持線路的可靠運(yùn)行。隨著電力電纜輸電線路的復(fù)雜化,出現(xiàn)了架空線和電纜的混合輸電線路。由于混合輸電線路的2種輸電線路的物理結(jié)構(gòu)和電氣參數(shù)存在明顯差異,除了在故障點(diǎn)處存在復(fù)雜的折反射現(xiàn)象以外,在線纜連接處也會(huì)存在復(fù)雜的行波折反射現(xiàn)象[6-10]。因?yàn)樾胁▊鞑ミ^程中在線纜連接點(diǎn)、故障點(diǎn)等阻抗不連續(xù)點(diǎn)的傳播特性復(fù)雜,所以如何正確利用故障行波的傳播特性定位架空線—電纜混合輸電線路故障,并分析不同過渡阻抗條件下對行波測距的影響,具有重要的研究意義。
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