Research On Data Processing Method Of Optical Fiber Raman Temperature Measurement System For Power Cable

With the rapid development of economy and the need of city construction,more and more power cables are used,which means that it greatly increases the proportion in transmission lines.Therefore,the stable operation of power cable is closely related to the stable operation of power grid.While the temperature is one of the important indicators to measure the stability of power cable,so it is important to monitor the temperature of power cable in real time.Distributed fiber raman temperature measurement system can realize real-time monitoring and can locate a specific temperature fault on the cable.The basic principle and the basic structure of the distributed optical fiber raman temperature measurement system is analysed,and on this basis,the performance of the system and the properties of noise in the system is analysed.Then,the importance of selecting the appropriate signal processing method to improve the SNR of the system is discussed.The basic principle of the classical temperature signal processing algorithm is introduced,mainly accumulative average algorithm and wavelet threshold denoising algorithm.And then,the problems existing in the classical algorithm in dealing with the cable temperature signal is analysed.On the basis of the above analysis,a threshold de-noising algorithm based on EMD decomposition to realize the data processing of power cable temperature signal is proposed,and the algorithm is simulated by MATLAB.And,the simulation effect,as well as signal-to-noise ratio and root-mean-square error are compared and analyzed.The results verify that using the algorithm to deal with the cable temperature signal is better.Finally,the data processing method of distributed optical fiber temperature measurement system is simulated and verified on LABVIEW.The interface design of cable temperature monitoring system based on LABVIEW is presented,including user login interface,cable temperature real-time monitoring interface,as well as temperature alarm interface,etc..