Wei Jie, Hao Yanpeng, Fu Yuan, Yang Lin, Gan Jiulin, Li Han
School of Electric Power, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China.
Sensors (Basel). 2020 Mar 26;20(7):1834. doi: 10.3390/s20071834.
Icing detection of composite insulators is essential for the security and stability of power grids. As conventional methods have met difficulties in harsh weather, a 110 kV composite insulator with embedded Fiber Bragg Gratings (FBGs) was proposed for detecting glaze icing in this paper. FBG temperature compensation sensors in ceramic tubes were adopted for simultaneous measurement of icicle loads and temperature. Then, temperature calibration experiments and simulated icicle load experiments were carried out to obtain temperature and icicle load characteristics of FBGs. The results showed that temperature sensitivities of FBG strain sensors and FBG temperature compensation sensors were 18.16 pm/°C, and 13.18 pm/°C, respectively. Besides, wavelength shifts were linearly related to icicle loads within the polar angle range of -60° to 60°, and the load coefficient of FBG facing the icicle was -34.6 pm/N. In addition, the wavelength shift generated by several icicles was equal to the sum of wavelength shifts generated by each icicle within the polar angle range of -15° to 15°. Finally, icicles can cause wavelength shifts of FBGs within a big shed spacing. The paper provides a novel icing detection technology for composite insulators in transmission lines.
复合绝缘子的覆冰检测对电网的安全稳定至关重要。由于传统方法在恶劣天气下遇到困难，本文提出一种嵌入光纤布拉格光栅（FBG）的110 kV复合绝缘子用于检测 glaze icing（此处可能有误，推测为“覆冰”）。采用陶瓷管中的FBG温度补偿传感器同时测量冰柱载荷和温度。然后，进行温度校准实验和模拟冰柱载荷实验以获取FBG的温度和冰柱载荷特性。结果表明，FBG应变传感器和FBG温度补偿传感器的温度灵敏度分别为18.16 pm/°C和13.18 pm/°C。此外，在-60°至60°的极角范围内，波长偏移与冰柱载荷呈线性关系，且面向冰柱的FBG的载荷系数为-34.6 pm/N。另外，在-15°至15°的极角范围内，多个冰柱产生的波长偏移等于每个冰柱产生的波长偏移之和。最后，冰柱可在大伞裙间距内引起FBG的波长偏移。本文为输电线路复合绝缘子提供了一种新型覆冰检测技术。
