Research On Data Exchange Method Of Transmission Line Condition Monitoring System

In order to improve the data transmission efficiency of transmission lines and study the transmission mode of transmission line condition monitoring data for the future,this thesis researched the Protocol Buffers,FTP protocol,FTP protocol,RTMP protocol,FFmpeg and H.264 coding standard,and applied Protocol Buffers,FTP protocol,RTMP protocol to transmission line status monitoring data transmission to achieve the transmission line of various types of data fast transmission.The thesis firstly studies the monitoring data of transmission line,and divides the data into structured data and unstructured data according to the characteristics of the monitoring data.The thesis use different methods for different data transmission.For structured data transmission technology,the thesis use Google's Protocol Buffers technology replaced the previously used Web Service technology,and use JAVA language programming verification,the results show that Protocol Buffers achieve better efficiency,take up less storage space.Then,for the transmission of discharge waveform data in unstructured data,the conventional transmission line on-line detection system can only process the discharge waveform data into the number of discharges,the peak value and the average discharge current before being uploaded,but it can not achieve the discharge waveform of the original data upload.This thesis designed to use FTP protocol to achieve the rapid discharge waveform data upload,and set up an FTP server,and use JAVA language programming to verify the feasibility of the method.Finally,for the transmission of video data in unstructured data,the RTSP protocol and the RTP / RTCP protocol are adopted in the State Grid standard.Although this method is better in real-time,sending a large number of UDP packets in the public network can easily cause blocking of the firewall and the client can hardly implement plug-in playback.The thesis designs a RTMP protocol to realize the fast upload of video data by studying the real-time internet broadcast system and on-demand system,and solves the problem of plug-in development and firewall blocking of video surveillance system.The thesis uses FFmpeg to encode H.264 for monitoring code stream,and uses TRMP protocol to package and send.At the same time set up a RTMP streaming media server,and uses the JAVA programming language with the third-party JavaCV development kit for experiments.The result shows that the delay meets the requirements of the State Grid Corporation when the network is in good network condition.