Corrosion monitoring and evaluation of steel strand for transmission line based on fiber Bragg grating (FBG)

2020 ◽  
Author(s):  
Jun Ma ◽  
Bo Lu ◽  
Yonggang Shi ◽  
Gang Dong ◽  
Xuefeng Zhao
Keyword(s):  
Transmission Line ◽  
Fiber Bragg Grating ◽  
Monitoring And Evaluation ◽  
Bragg Grating ◽  
Corrosion Monitoring ◽  
Steel Strand

Optical Sensor for Steel Corrosion Monitoring Based on Etched Fiber Bragg Grating Sputtered With Iron Film

2015 ◽  
Vol 15 (6) ◽  
pp. 3551-3556 ◽  
Author(s):  
Ning Zhang ◽  
Wei Chen ◽  
Xing Zheng ◽  
Wenbin Hu ◽  
Min Gao
Keyword(s):  
Fiber Bragg Grating ◽  
Optical Sensor ◽  
Steel Corrosion ◽  
Iron Film ◽  
Bragg Grating ◽  
Corrosion Monitoring

Whole-Span and Whole Length Pre-Stress Loss Monitoring Technique Study in Bonded Pre-Stressed System

2012 ◽  
Vol 188 ◽  
pp. 144-149
Author(s):  
Ji Bin Zhang ◽  
Song Tao Lin ◽  
Juan Gao
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Optic Fiber ◽  
Electromagnetic Environment ◽  
Monitoring Technique ◽  
Steel Strand ◽  
Margin Of Safety ◽  
Novel Method

The load of pre-stress structure comes from stretching of steel strand, but the stress built on the steel strand would be lost. The lost causes many problems on the structure, such as pre-stress uneven and margin of safety reduced. Monitoring stress lever on the steel strand can provide information of the structure, and then expert can estimate the behavior under load of structure. It is hardly to monitor the whole-span and whole length of steel strand by traditional senses and method, because of measure range, protection and interference of electromagnetic environment. A novel method based on Optic Fiber Bragg Grating (OFBG), which mentioned in the article, provides a successful experience on the monitoring of pre-stress loss in whole-span and whole length.

An Overhead Conductor Weighing Sensor Based on Fiber Bragg Grating

2013 ◽  
Vol 462-463 ◽  
pp. 32-38
Author(s):  
Shi Bin Liang ◽  
Hong Lei Yang ◽  
Xue Peng Miao ◽  
Min Cao ◽  
Ming Chang
Keyword(s):  
Transmission Line ◽  
Fiber Bragg Grating ◽  
Temperature Compensation ◽  
Sensitivity Coefficient ◽  
Bragg Grating ◽  
Strain Sensing ◽  
Center Wavelength ◽  
Repeatability Error ◽  
Sensor Module ◽  
Tension Sensor

Snow and ice disasters on power system safe and reliable operation of the transmission line has a great threaten.An overhead conductor tension sensor based on fiber Bragg grating is developed.The sensor contains a strain sensor module and a temperature compensation module which can offer temperature compensation for strain sensing module.The sensor connected to the tower and the insulator with metallic clamps.If there is ice on the transmission line,the tension of the sensor sensing module of the center wavelength will corresponding change,and the ice condition of the transmission wires can be reflected by the center wavelength variation.Experiment indicates that the tension sensitivity coefficient of the sensor is 9.8 pm/kN,the repeatability error is 1.78% FS,the nonlinear error is2.4% FS, the hysteresis is 1.5% FS.

Application of Fiber Bragg Grating Device in Icing Monitoring System of Transmission Lines

2014 ◽  
Vol 543-547 ◽  
pp. 1030-1034 ◽  
Author(s):  
Feng Lian Liu ◽  
Li Rui Guo ◽  
Yuan Shi Deng ◽  
Chi Wu ◽  
Jiang Ling Li ◽  
...  
Keyword(s):  
Transmission Line ◽  
Fiber Bragg Grating ◽  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Bragg Grating ◽  
Stable Operation ◽  
Monitoring Device ◽  
Active Sensors ◽  
Bragg Grating Sensor ◽  
Monitoring Devices

Ice accretion has been a huge threat for the stable operation of transmission line. Icing monitoring devices used presently are active sensors with low working stability. Signals are transmitted in the electrical form, which are easily affected by the electromagnetic interference. In this paper, an online icing monitoring device of transmission line based on fiber bragg grating (FBG) sensor is designed, and is operated as a pilot unit on the 44# tower of 110kV Zhenzou line. Experimental results show that the online icing monitoring device operates stably, and the designed fiber bragg grating sensor has high linearity, good sensitivity and high accuracy.

scholarly journals A Fiber Bragg Grating-Based Dynamic Tension Detection System for Overhead Transmission Line Galloping

Sensors ◽  
2018 ◽  
Vol 18 (2) ◽  
pp. 365 ◽  
Author(s):  
Guo-ming Ma ◽  
Ya-bo Li ◽  
Nai-qiang Mao ◽  
Cheng Shi ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Transmission Line ◽  
Fiber Bragg Grating ◽  
Detection System ◽  
Bragg Grating ◽  
Dynamic Tension ◽  
Overhead Transmission Line

scholarly journals Strain, natural frequency, damping coefficient and elastic modulus of mortar beams determined by fiber Bragg grating (FBG) sensors

2021 ◽  
Vol 14 (3) ◽  
Author(s):  
Gustavo Macioski ◽  
Valmir de Oliveira ◽  
Marcelo Henrique Farias de Medeiros
Keyword(s):  
Elastic Modulus ◽  
Fiber Bragg Grating ◽  
Monitoring And Evaluation ◽  
Damping Coefficient ◽  
Bragg Grating ◽  
Natural Vibration Frequency ◽  
Good Precision ◽  
Engineering Structures ◽  
Elastic Module ◽  
Fbg Sensors

Abstract Structural health monitoring can detect anomalies in time, allowing the implementation of more efficient maintenance and repair actions in special engineering structures. An alternative in the monitoring and evaluation of structures in civil engineering is the use of optical fibers inscribed with Bragg gratings (FBG or Fiber Bragg Grating). This paper aims to compare available techniques to estimate the elastic module of cementitious composites, as well as contribute to the application of optical fiber sensors in the monitoring of strain, natural vibration frequency, damping coefficient and elastic modulus of mortar beams. The FBG sensors manufactured and calibrated by the authors presented a good precision for measuring those parameters in mortar samples. The results show that FBG sensors and strain gauge sensors present a similar result for strain and estimation of the elastic module (static and dynamic), therefore, bare FBGs could be further investigated for non-destructive testing.

scholarly journals Detection of Broken Strands of Transmission Line Conductors Using Fiber Bragg Grating Sensors

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2397 ◽  
Author(s):  
Long Zhao ◽  
Xinbo Huang ◽  
Jianyuan Jia ◽  
Yongcan Zhu ◽  
Wen Cao
Keyword(s):  
Wind Speed ◽  
Transmission Line ◽  
Fiber Bragg Grating ◽  
Natural Frequency ◽  
Monitoring System ◽  
Natural Frequencies ◽  
Modal Identification ◽  
Bragg Grating ◽  
Frequency Variation ◽  
Natural Frequency Variation

Transmission lines are affected by Aeolian vibration, which causes strands to break and eventually causes an entire line to break. In this paper, a method for monitoring strand breaking based on modal identification is proposed. First, the natural frequency variation of a conductor caused by strand breakage is analyzed, and a modal experiment of the LGJ-95/15 conductor is conducted. The measurement results show that the natural frequencies of the conductor decrease with an increasing number of broken strands. Next, a monitoring system incorporating a fiber Bragg grating (FBG)-based accelerometer is designed in detail. The FBG sensor is mounted on the conductor to measure the vibration signal. A wind speed sensor is used to measure the wind speed signal and is installed on the tower. An analyzer is also installed on the tower to calculate the natural frequencies, and the data are sent to the monitoring center via 3G. Finally, a monitoring system is tested on a 110 kV experimental transmission line, and the short-time Fourier transform (STFT) method and stochastic subspace identification (SSI) method are used to identify the natural frequencies of the conductor vibration. The experimental results show that SSI analysis provides a higher precision than does STFT and can extract the natural frequency under various wind speeds as an effective basis for discriminating between broken strands.

Sign in / Sign up

Export Citation Format

Share Document