Galloping Vibration Monitoring of Overhead Transmission Lines by Chirped FBG Array

Abstract

A distributed online fiber sensing system based on the phase-sensitive optical time domain reflectometer (Φ-OTDR) enhanced by the drawing tower fiber Bragg grating (FBG) array is presented and investigated experimentally for monitoring the galloping of overhead transmission lines. The chirped FBG array enhanced Φ-OTDR sensing system can be used to measure the galloping behavior of the overhead transmission lines (optical phase conductor or optical power ground wire), which are helpful for monitoring the frequency response characteristics of the ice-induced galloping, evaluating the motion tendencies of these cables, and avoiding the risk of flashover during galloping. The feasibility of the proposed online monitoring system is demonstrated through a series of experiments at the Special Optical Fiber Cable Laboratory of State Grid Corporation of China (Beijing, China). Results show that the proposed system is effective and reliable for the monitoring of galloping shape and characteristic frequency, which can predict the trend of destructive vibration behavior and avoid the occurrence of cable breaking and tower toppling accidents, and these features are essential for the safety operation in smart grids.

All‐in‐One Sensing System for Online Vibration Monitoring via IR Wireless Communication as Driven by High‐Power TENG

“…Such a structure renders itself a possibility that to be conveniently deployed on equipment and even in its interior to obtain abnormal vibration information, which is potential for practical application in typical scenarios such as flow excitation in hydraulic turbine instabilities, [ 48,49 ] transformer winding condition assessment, [ 50,51 ] mechanical defect identification for gas‐insulated switchgear, [ 52,53 ] and aeolian vibration disrupted transmission line fatigue. [ 54,55 ]…”

“…Such a structure renders itself a possibility that to be conveniently deployed on equipment and even in its interior to obtain abnormal vibration information, which is potential for practical application in typical scenarios such as flow excitation in hydraulic turbine instabilities, [48,49] transformer winding condition assessment, [50,51] mechanical defect identification for gas-insulated switchgear, [52,53] and aeolian vibration disrupted transmission line fatigue. [54,55] The detailed structural diagram of TENG is illustrated in Figure 1b, which is a mechanical switch-integrated three-layer sandwich structure with two couples of contact-separation layers. Specifically, the top and bottom fixed layers are both composed of triboelectric layer with back electrode as well as an independent mechanical contact along one side, and the triboelectric materials herein are polyamide (PA) and polytetrafluoroethylene (PTFE), respectively.…”

High precision uwCFBG wavelength calculation method based on correlation coefficient

“…Jiang et al [7] successfully mastered the continuous inscription technique of ultra-weak fiber Bragg grating (uwFBG) arrays in the fiber preparation process through a single exposure using an excimer laser, its key advantages being large-scale multiplexing capacities and minimal crosstalk interference, aspects that have fostered a vigorous development in multiple engineering fields [8]. In the uwFBG system, ultra-weak chirped fiber Bragg gratings (uwCFBGs) hold significant potential for engineering applications [9]. Owing to its wider bandwidth, the coherent vibration detection based on narrow linewidth lasers presents unique advantages [10].…”

Self‐Powered Vibration Frequency Monitoring Device for the Grid Based on Triboelectric Nanogenerator and Micro Thermoelectric Generator

“…[10] Although solutions based on visual and traditional sensors could achieve real-time monitoring of galloping in transmission lines, both of these approaches required power from batteries or transmission lines, resulting in higher maintenance costs. [11,12] Traditional methods for monitoring power transmission lines are no longer sufficient to satisfy the needs of the smart grid. There is a need for a self-powered device that can provide real-time monitoring of the TLs operating, replacing manual inspections.…”