基于振动频谱机理的架空输电线路张力检测方法  

Study on Overhead Transmission Line Tension Detection Based on Vibration Spectrum Analysis

作　　者：周海滨[1] 董明[1] 余建国 王国利 杨彦博[1] 

机构地区：[1]电力设备电气绝缘国家重点实验室西安交通大学,西安710049 [2]特高压工程技术(昆明广州)国家工程实验室,广州510623

出　　处：《华东电力》2012年第3期412-417,共6页East China Electric Power

基　　金：国家自然科学基金(50907051);特高压工程技术(昆明;广州)国家工程实验室开放基金~~

摘　　要：介绍了采用振动频谱分析法实现线路张力的间接测量。首先,分析了导线微风振动的原理,讨论了导线张力与其振动频谱相关性的理论模型。在此基础上,搭建了导线张力和振动信号同步测试系统,校准了张力测量系统,设计了振动测量系统。根据架空输电线路的实测结果,采用小波分析对信号进行了降噪处理和分析。结果表明,振动频谱法能够对架空输电线路张力提供较好估计,适合在线监测使用;导线横向水平振动时,频谱分布与理论计算结果存在差异,其一阶振动本征频率相对变小,认为对于多股绞合导线,大振幅振动产生较大阻尼力,消耗风能输入功率,降低了振动频率。This paper presents the spectrum analysis method to detect indirectly the tension of overhead transmission line.Firstly,the principle of vibration led by breeze is analyzed,and the theory model of relationships between wire tension and its vibration spectrum is discussed.And then,the measurement system for synchronous measurement of wire tension and vibration is set up;the tension measurement system is calibrated;the vibration measurement system is designed.Finally,actual measurement on overhead transmission lines is taken,wavelet-based de-noising algorithm is used to reduce noise,and results data is analyzed.The results show that this method provides a good forecast for the tension of overhead transmission line and is suitable for online monitoring.For transverse horizontal vibration, spectral distribution results are different from theoretical calculation and first-order vibration frequency is relatively lower.This paper picks up a hypothesis which is,for stranded wire,larger amplitude leads larger damping force and more power consumption,so the vibration Eigen frequency is reduced.

关 键 词：架空输电线路 张力检测 振动检测 频谱分析 嵌入式LINUX系统 小波降噪 

分 类 号：TM726.3[电气工程—电力系统及自动化]