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微地形引起的輸電線路舞動(dòng)案例分析

來源:電工電氣發(fā)布時(shí)間:2023-10-17 15:17 瀏覽次數(shù):261

微地形引起的輸電線路舞動(dòng)案例分析

董新勝1,蔡敏博2,董仲凱2,王躍2,劉新民2
(1 國(guó)網(wǎng)新疆電力有限公司電力科學(xué)研究院,新疆 烏魯木齊 830011;
2 國(guó)網(wǎng)新疆電力有限公司,新疆 烏魯木齊 830000)
 
    摘 要:輸電線路舞動(dòng)主要由氣象、地理、線路結(jié)構(gòu)等因素等造成,其中微地形對(duì)風(fēng)速有重要影響,進(jìn)而影響到導(dǎo)地線的覆冰及舞動(dòng)。對(duì)處于微地形的某輸電線路舞動(dòng)案例進(jìn)行了山地風(fēng)場(chǎng)仿真分析,結(jié)果表明附近微地形山丘對(duì)該輸電線路的風(fēng)速水平加速比達(dá)到了1.1,現(xiàn)場(chǎng)勘驗(yàn)發(fā)現(xiàn) N5—N6、N6—N7 舞動(dòng)幅值有明顯差別,通過對(duì)影響舞動(dòng)的因素分析,表明是由兩段檔距的大小差異造成的。提出了加裝相間間隔棒、增塔縮檔的防范措施。
    關(guān)鍵詞: 輸電線路舞動(dòng);微地形;風(fēng)速;加速比
    中圖分類號(hào):TM726     文獻(xiàn)標(biāo)識(shí)碼:B     文章編號(hào):1007-3175(2023)09-0030-04
 
Analysis of Transmission Line Galloping Caused by Micro-Topography
 
DONG Xin-sheng1, CAI Min-bo2, DONG Zhong-kai2, WANG Yue2, LIU Xin-min2
(1 Electric Power Research Institute of State Grid Xinjiang Electric Power Co., Ltd, Urumqi 830011, China;
2 State Grid Xinjiang Electric Power Co., Ltd, Urumqi 830000, China)
 
    Abstract: Transmission line galloping is mainly caused by meteorology, geography, line structure and other factors. Among them, micro-topography has an important influence on wind speed, which in turn affects the icing and galloping of ground conductors.The paper simulates a mountain wind field to analyze a transmission line galloping case , and the results show that the nearby micro-topography hill makes the wind speedup ratio of transmission lines reaches 1.1. According to the on-site investigation, there is a significant difference of galloping amplitudes between N5—N6 and N6—N7. After analyzing factors affecting the galloping, it finds that the size of two span distances is the cause, so prevention measures of installing interphase spacers, increasing towers and reducing span are put forward.
    Key words: transmission line galloping; micro-topography; wind velocity; speedup ratio
 
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