基于光纤传感的输电线路杆塔倾斜监测研究

Monitoring and research on tilt of transmission line tower based on optical fiber sensing

输电线路杆塔倾斜的在线监测为杆塔倒塔的预防提供了数据支撑,保障了电网的安全稳定运行。应用光纤传感技术,选取杆塔不同高度的测点,安装光纤光栅双轴倾角传感器,监测杆塔倾斜角度及杆塔的应力变形,实现了云南电网某110 kV输电线路杆塔倾斜的在线监测。以2018年2月1日至2018年5月31日4个月的监测数据为例,由塔顶的双轴倾角传感器得到的杆塔倾斜角度主要集中在0°～1.5°,最大倾斜角3°,由塔腰的双轴倾角传感器得到的杆塔倾斜角度主要集中在0°～1°,最大倾斜角2.5°。结果表明,塔顶倾斜角度约为塔腰倾斜角度的1.3～1.8倍,杆塔从塔腰到塔顶的位置出现了应力变形。基于光纤传感的输电线路杆塔倾斜监测方法可用来监测杆塔的倾斜情况,对后续杆塔倾斜问题的研究有着重要意义。

The online monitoring on tilt of the transmission line tower provides data support for prevention of tower collapse and ensures the safe and stable operation of the grid. In this paper,the optical fiber sensing technology is applied,the measuring points are selected at different heights of the tower and the fiber Bragg grating dual-axis tilt sensor is installed to monitor the tower tilt angle and stress deformation,which realizing the online monitoring on tilt of a 110kV transmission line tower in Yunnan Power Grid. Taking the monitoring data from February 1,2018 to May 31,2018 as an example,the tower tilt angle obtained from the dual-axis tilt sensor at the tower top is mainly within the range of 0° ~ 1. 5°,and the maximum tilt angle is 3°,the tower tilt angle obtained from the dual-axis tilt sensor at the tower waist is mainly within the range of 0° ~ 1°,and the maximum tilt angle is 2. 5°. The results show that the tilt angle of the tower top is about 1. 3 ~ 1. 8 times of the same of the tower waist,and the stress deformation occurs from the tower waist to the tower top. The transmission line tower tilt monitoring method based on optical fiber sensing can be used to monitor the tower tilt,which is of great significance for subsequent researches on the tower tilt problems.