基于OPGW的输电线路雷击与非雷击信号时频特征分析

针对输电线路OPGW光传感雷击监测不能有效区分非雷击干扰的问题,根据OPGW分布式雷击监测系统现场测量的信号和光纤振动试验信号,采用时频分析方法对光纤振动信号、OPGW雷击信号和非雷击信号的特征进行提取分析。结果表明,雷击信号从低频到高频均有能量分布,频带范围为0~400kHz,非雷击信号主要分布在低频0~2.5kHz频段,光纤振动信号的时频特征与OPGW实测非雷击干扰信号的时频特征具有高度相似性,OPGW分布式雷击监测系统的非雷击干扰信号可能主要为振动信号。

Time-frequency Characteristics Analysis of Lightning and Non-lightning Strike Signals for Transmission Lines Based on OPGW

Aiming at the problem that the lightning stroke monitoring of transmission line OPGW optical sensor can not distinguish non-lightning interference effectively, according to the signal obtained from the field measurement of the OPGW distributed lightning stroke monitoring system and the signal obtained from the optical fiber vibration test, the time-frequency analysis method was used to extract the characteristics of optical fiber vibration signal, OPGW lightning signal and non lightning signal. The results show that the lightning signal is distributed from low frequency to high frequency, the frequency range is 0-400 kHz; non-lightning signal is mainly distributed in the low frequency 0-2.5 kHz band, and the time-frequency characteristics of fiber optic vibration signals are highly similar to the time-frequency characteristics of the measured OPGW non-lightning interference signals; non-lightning interference signal of OPGW distributed lightning monitoring system may be mainly vibration signal.