Usability of fiber Bragg grating sensors for the fatigue life monitoring of overhead transmission lines

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI:10.1109/CMD.2018.8535970

Xinbo Hang, Han Zhang, Yu Zhao

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引用次数: 1

Abstract

Fretting fatigue of transmission lines, caused by Aeolian vibration, always leads to catastrophic failure of conductors. The fatigue life monitoring of overhead transmission lines is an effective method to foresee strands broken of the conductor. Fatigue severity is usually expressed by alternating bending stress which occurs in the vicinity of suspension clamps during vibration. Given that it is hard to measure the fatigue stress directly, according to IEEE, alternating bending amplitude is recommended as a substitute measured parameter for fatigue life. In this paper, an on-line monitoring system based on a fiber-optic acceleration sensor is designed to analyze the fatigue life of overhead transmission lines in Aeolian vibration surveillance. Considering its superior performance of anti-electromagnetic interference, Fiber Bragg Grating (FBG) sensor is used to measure alternating bending amplitude of overhead transmission lines. And a Cumulative Fatigue Damage (CFD) method, which is based on alternating bending amplitude for vibration and the Stress-Cycle (S-N) curves, is proposed to calculate the fatigue life of overhead transmission lines. A case study of the one-month measurement data of Aeolian vibration for 1000kV Ultra-High Voltage (UHV) transmission lines is presented. Then an on-line monitoring system based on a fiber-optic acceleration sensor is designed to analyze the fatigue life of overhead transmission lines in Aeolian vibration surveillance.

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光纤光栅传感器在架空输电线路疲劳寿命监测中的可用性

由风致振动引起的输电线路微动疲劳常导致导线的灾难性失效。架空输电线路疲劳寿命监测是预见导线断股的有效手段。疲劳严重程度通常由振动时发生在悬挂夹附近的交变弯曲应力表示。考虑到直接测量疲劳应力的困难，IEEE建议将交变弯曲幅值作为替代疲劳寿命的测量参数。本文设计了一种基于光纤加速度传感器的架空输电线路风振监测疲劳寿命在线监测系统。光纤布拉格光栅(FBG)传感器由于具有良好的抗电磁干扰性能，被用于架空输电线路交变弯曲幅度的测量。提出了一种基于振动交变弯曲幅值和应力-周期曲线计算架空输电线路疲劳寿命的累积疲劳损伤(CFD)方法。以1000kV特高压输电线路一个月的风成振动测量数据为例进行了分析。在此基础上，设计了基于光纤加速度传感器的架空输电线路风蚀振动在线监测系统，对架空输电线路进行了疲劳寿命分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 Condition Monitoring and Diagnosis (CMD)

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