The Reusable Load Cell with Protection Applied for Online Monitoring of Overhead Transmission Lines Based on Fiber Bragg Grating.
The Reusable Load Cell with Protection Applied for Online Monitoring of Overhead Transmission Lines Based on Fiber Bragg Grating.
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基于光纤光栅的架空输电线路在线监测可重复使用带保护称重传感器
DOI：
10.3390/s16060922
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发表时间：
2016-06-21
期刊：
影响因子：
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通讯作者：
Li C
中科院分区：
文献类型：
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作者：
Ma G;Mao N;Li Y;Jiang J;Zhou H;Li C
高压架空输电线路覆冰严重时，可能会导致导线断裂、杆塔倒塌，造成电力供应的意外中断。用于冰监测系统的光学称重传感器不受电磁干扰，现场不需要电源。因此，它已成为国内外研究的热点。本文针对测量中存在的偏载问题，采用了附加槽的剪切结构，改善了应变分布，获得了良好的重复性。然后，在弹性元件的前后槽上通过点焊的方式安装光纤布拉格光栅（FBG），使FBG的方向相互偏离90°，从而实现温度补偿，而无需额外的FBG。之后，保护部件的设计确保了轻载条件下的高灵敏度和高达65 kN的重载下的工业安全性。拉伸实验结果表明，该传感器在常规量程（0-10 kN）内的灵敏度为0.1285pm/N，分辨率为7.782N。重载拉伸实验证明，该保护结构工作正常，经过多次高载荷（65 kN）循环后，灵敏度和分辨率基本不变。此外，实验表明，该传感器的分辨率为87.79 N的大负载范围内，允许该参数用于重覆冰监测。
Heavy ice coating of high–voltage overhead transmission lines may lead to conductor breakage and tower collapse causing the unexpected interrupt of power supply. The optical load cell applied in ice monitoring systems is immune to electromagnetic interference and has no need of a power supply on site. Therefore, it has become a hot research topic in China and other countries. In this paper, to solve the problem of eccentric load in measurement, we adopt the shearing structure with additional grooves to improve the strain distribution and acquire good repeatability. Then, the fiber Bragg grating (FBG) with a permanent weldable package are mounted onto the front/rear groove of the elastic element by spot welding, the direction deviation of FBGs is 90° from each other to achieve temperature compensation without an extra FBG. After that, protection parts are designed to guarantee high sensitivity for a light load condition and industrial safety under a heavy load up to 65 kN. The results of tension experiments indicate that the sensitivity and resolution of the load cell is 0.1285 pm/N and 7.782 N in the conventional measuring range (0–10 kN). Heavy load tension experiments prove that the protection structure works and the sensitivity and resolution are not changed after several high load (65 kN) cycles. In addition, the experiment shows that the resolution of the sensor is 87.79 N in the large load range, allowing the parameter to be used in heavy icing monitoring.