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500 kV輸電鐵塔力學失效分析和失效預測研究

來源：電工電氣發布時間：2024-05-08 14:08 瀏覽次數：687

500 kV輸電鐵塔力學失效分析和失效預測研究

陳易飛¹, 陽林¹, 黃歡², 吳建蓉²

(1 華南理工大學電力學院，廣東廣州 510640；

2 貴州電網電力科學研究院，貴州貴陽 550000)

摘要：針對中國南方地區典型覆冰線路，采用有限元仿真方法建立了 500 kV 輸電鐵塔的仿真模型，開展了不均勻覆冰下不同覆冰厚度和不同風速等工況的力學特性分析，統計得到鐵塔的薄弱點位置規律。基于薄弱點構件的軸向應力和節點位移，開展輸電鐵塔力學失效分析，并通過基于 BP 神經網絡的輸電鐵塔力學失效預測方法研究，實現對輸電鐵塔最大軸向應力和節點位移的預測。結果表明：相同風速和基本冰厚下，長、短檔距側冰厚值相差越大，薄弱點構件軸向應力和節點位移值越大；隨著覆冰厚度的增加，風速對節點位移的影響更大；相同冰風荷載下，長檔距側重覆冰對軸向應力和節點位移的影響要大于短檔距側重覆冰；不均勻覆冰工況下，500 kV 輸電鐵塔的薄弱點位置主要分布在輸電鐵塔塔頭地線支架處、上下曲臂連接處、瓶頸處以及鐵塔的塔身處。該預測方法可以實現對其最大軸向應力和節點位移的有效預測，為重冰區輸電鐵塔的失效預測提供了參考。

關鍵詞： 覆冰線路；輸電鐵塔；失效分析；失效預測

中圖分類號：TM726 ；TM753 文獻標識碼：A 文章編號：1007-3175(2024)04-0017-10

Study on Mechanical Failure Analysis and Failure Prediction of

500 kV Transmission Tower

CHEN Yi-fei¹, YANG Lin¹, HUANG Huan², WU Jian-rong²

（1 School of Electric Power Engineering, South China University of Technology, Guangzhou 510640, China;

2 Guizhou Power System Research Institute, Guiyang 550000, China）

Abstract: This paper focuses on typical icing transmission lines in southern China and uses finite element simulation method to establish the simulation model of 500 kV transmission towers. The mechanical characteristics of different icing thicknesses and wind speeds under uneven icing working conditions are analyzed, and the weak point position rules of the towers are statistically obtained. Based on the axial stress and nodal displacement of weak point components, the mechanical failure analysis of the transmission tower was carried out, and the prediction of the maximum axial stress and nodal displacement of the transmission tower was realized through the research of the transmission tower mechanical failure prediction method based on BP neural network. The study results show that the greater the difference between the ice thickness values of the long and short pitch sides, the greater the axial stress and node displacement values of the weak point members under the same wind speed and basic ice thickness. As the thickness of ice cover increases, the influence of wind speed on node displacement becomes greater. Under the same ice wind load, the influence of longpitch heavy icing on axial stress and nodal displacement is greater than that of shortpitch heavy icing. Under uneven icing working conditions, the weak points position of 500 kV transmission towers are mainly distributed at the ground wire support of the tower head, the connection between the upper and lower curved arms, the bottleneck, and the body of the tower. The prediction method can effectively predict the maximum axial stress and nodal displacement providing a reference to the failure prediction of transmission towers in heavy ice areas.

Key words: icing transmission line; transmission tower; failure analysis; failure prediction

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