Research on online monitoring method for time-varying tension in transmission lines based on operational modal response

Zhicheng Liu, Long Zhao, Guanru Wen, Jingyao Wang, Jiameng Wang, Xinbo Huang
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Abstract

The cumulative overload of conductor tension under severe weather conditions is an important cause of accelerated fatigue fracture of transmission lines. Traditional tension measurement methods require the replacement of ball head hanging rings, which poses safety risks. In this paper, a method for monitoring conductor tension based on acceleration data under operating conditions is proposed. Firstly, a modal order extraction based method for identifying the modal frequencies of conductor operation is proposed, and then the time-varying tension of the conductor is estimated based on the instantaneous modal frequencies. Since this method directly installs sensors on the conductor, there is a certain error in the obtained intrinsic characteristic data of the conductor. Therefore, a modal correction method is used to remove the influence of the sensors. The accuracy of modal identification, modal correction, and tension identification methods is verified through finite element models. Based on the above methods, a monitoring system for conductor tension status is designed, and the feasibility of this system is verified through experiments. Finally, the vibration data obtained from the field engineering pilot test is successfully used for conductor tension analysis. The results show that the proposed method can effectively identify time-varying tension and provide a new approach for monitoring the status of transmission line conductors.
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基于运行模态响应的输电线路时变张力在线监测方法研究
恶劣天气条件下导体张力的累积过载是导致输电线路加速疲劳断裂的重要原因。传统的张力测量方法需要更换球头吊环,存在安全隐患。本文提出了一种基于运行条件下加速度数据的导线张力监测方法。首先,提出一种基于模态阶次提取的方法来识别导体运行的模态频率,然后根据瞬时模态频率估算导体的时变张力。由于该方法直接在导体上安装传感器,因此获得的导体固有特性数据存在一定误差。因此,需要使用模态修正方法来消除传感器的影响。模态识别、模态修正和张力识别方法的准确性通过有限元模型得到验证。基于上述方法,设计了导线张力状态监测系统,并通过实验验证了该系统的可行性。最后,现场工程试验获得的振动数据被成功用于导体张力分析。结果表明,所提出的方法能有效识别时变张力,为输电线路导体状态监测提供了一种新方法。
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