Research on Fiber Breakage Localization of Long-Distance OPGW Cables with Rayleigh Scattering Signal
Optical fiber composite overhead ground wire(OPGW)is prone to fiber breakage faults due to lightning strikes,ice coverage,burns,and strand breakage,resulting in the interruption of backbone power supply and dispatching communications,and threatening the safety of power system electricity.With the gradual expansion of fiber optic applications,the detection of large-scale fiber breakage faults has become a difficult problem.The proposed method is based on wide-area measurement to locate fiber breaks in long-distance OPGW cables.Based on the Rayleigh scattering principle,the Rayleigh scattering signals reflected from incident photons entering the core structure of OPGW cables are collected.The fast Fourier transform,which has the highest retention of signal waveform features,is utilized to eliminate the Rayleigh scattering signal noise.The amplitude fluctuation of the Rayleigh scattered signal in a three-dimensional view is fitted by a phase modulator to identify the location of fiber breaks in OPGW cables where the signal amplitude has dropped significantly.Using the characteristics of Rayleigh scattering signals with large changes in amplitude that can be captured over long-distances,it is possible to locate the broken fibers of OPGW cables over long-distances.The test results show that the proposed method has a long distance,high accuracy,and high efficiency.Through the application of the proposed method,the broken fiber position in OPGW cables can be timely and accurately located,which can help maintenance personned to quickly respond and handle faults,so as to minimize the interruption time of the power system caused by broken fiber faults,and improve the reliability and stability of the power system.
NETL
NSTL
万方数据
维普
