Study Of Galloping Monitoring Technology For The Fusion Of Transmission Line Monitoring Device And Spacer Bar Structure

In order to solve the problem of uneven power distribution,China is vigorously developing high-voltage transmission lines to make China’s power grid operating mileage and coverage area increasingly expand.In recent years,due to the frequent occurrence of extreme weather,the safe operation of the power grid faces huge challenges.Transmission line galloping is a more common phenomenon,once the wire galloping can cause the transmission tower to collapse,line breakage,broken metal,phase flashover,and other accidents,a greater threat to the safe operation of the power grid.Therefore,the impact factors for conductor galloping,galloping prevention,and galloping early warning research is necessary.This type of research is required through the galloping monitoring system to obtain the conductor galloping amplitude and frequency and other related data support.This paper addresses the above needs and carries out the research work related to the galloping monitoring system,designs and extracts the feature values of the galloping monitoring system,further completes the design and analysis of the installation structure of the galloping monitoring system,and proposes the design of the galloping monitoring system and the algorithm design of the galloping monitoring system,and conducts the relevant galloping experiments in the laboratory environment,and conducts experimental verification of the galloping monitoring system prototype.The main research contents of this paper are as follows:(1)According to the demand for transmission line galloping monitoring systems and relevant national technical standards,the overall scheme of galloping monitoring system is designed.The whole galloping monitoring system consists of online monitoring system,an ontower monitoring system and data processing center;The online monitoring system takes the attitude sensor as the core and transmits data with the tower monitoring system through Zig Bee,and NB-Io T is used for data transmission between the tower monitoring system and the data processing center.(2)The galloping monitoring system installation structure is designed according to the conductor spacer bar,and the original structural function of the spacer bar is retained while giving it the function of galloping information sensing.In order to study the degree of influence of the designed galloping monitoring system installation structure on the original transmission line,static analysis,structural multi-objective optimization,two-dimensional and threedimensional structural simulation analysis in fluid environment,tail flow distribution analysis and two-way fluid-structure coupling simulation analysis are carried out.Through multidimensional simulation analysis,it can be seen that the designed galloping monitoring system installation structure has a small impact on the original transmission line,and the galloping displacement error between the two is 7.38% to meet the actual engineering requirements.(3)For the designed galloping monitoring system,complete the selection of control system chip,Zig Bee module and NB-Io T module and the corresponding peripheral circuit design.Carry out the circuit design of power management module and the environmental adaptation design of monitoring system,and complete the design of corresponding attitude solving algorithm and gravitational acceleration filtering algorithm according to the design scheme of galloping monitoring system.(4)According to the characteristics of the data collected by the galloping monitoring system,the corresponding data pre-processing methods are selected.The acceleration data preprocessing methods are mainly the least squares method to remove the trend term and adaptive smoothing filtering processing.The constant deviation and mean error methods are used to preprocess the angular velocity data.Further for the pre-processed acceleration,the wire galloping amplitude is calculated using time-frequency domain hybrid integration.The accuracy of the angle measurement of the attitude sensor is tested under laboratory conditions,and the relevant galloping experiments are done on the standard galloping test bench.The comparison between the measured results of the monitoring system and the standard galloping amplitude of the test bench shows that the X and Y axis amplitude errors are within 10%,and the results show that the measured amplitude reduction of the wire galloping trajectory curve is basically consistent with the actual galloping.Finally,the upper computer is developed by Lab VIEW for real-time display of the wire galloping monitoring data.