Transmission Line Galloping Monitoring Device Based On Fiber Grating Strain Sensor

A global energy-connected network with a wide range of construction services,strong configuration capabilities,high security and reliability,and green and low-carbon is the development direction of power grid construction.Advanced power technology and information and communication technologies drive the operation of the entire grid.Advanced sensors,intelligent devices,and diverse network communication mechanisms are important support for building an energy Internet.The galloping of overhead transmission lines has always been a major obstacle to building a strong power grid,and the annual loss caused by the galloping is immeasurable.As an emerging sensing technology,optical fiber sensing technology has been widely studied in various fields due to its advantages of passive,anti-electromagnetic interference,long information transmission distance and reliable data transmission.It is an important power monitoring technology solution.The means of monitoring the galloping of overhead transmission lines are mainly based on video surveillance and acceleration sensor at present.However,both methods have problems such as unstable energy supply,vulnerability to electromagnetic interference,and untimely data transmission,that they are prone to high damage rate,low accuracy,unreliable data transmission in real-world applications.There is a need for a passive,anti-electromagnetic interference,reliable data transmission method through transmission line in galloping monitoring technology eagerly.In this paper,the research of transmission line galloping monitoring device based on fiber Bragg grating sensing technology is demonstrated,real-time monitoring of the galloping condition of overhead transmission lines is realized,and the warning of accidents such as strand breaks caused by line galloping can be realized.The main research work and results are as follows:1.A fiber-optic Bragg grating based transmission line galloping monitoring device is designed.The electronic galloping measurement device cannot accurately recognize the situations of line galloping and is difficult in supplying energy to the sensing device.In this paper,a novel fiber Bragg grating-based sensor is proposed which is able to measure the frequency of the galloping transmission line.The new strain sensor adopts a cantilever beam like structure,which not only effectively solves the commonly cross-sensitive problem in fiber sensing,but also improves the accuracy of the sensor.2.A fiber-optic passive transmission line galloping monitoring system is designed.By utilizing the characteristics of the simultaneous construction of the communication optical cable and the wire,the problem of unstable transmission of the transmission signal of the electronic galloping monitoring device is solved,and the long-distance real-time monitoring is realized.Through the actual system construction and operation test,results proved that the system has high stability and small error.3.Two kinds of algorithm based on fiber grating strain sensor for transmission line galloping frequency measurement are proposed.The feasibility of monitoring devices and algorithms was verified by several simulation experiments in the China Electric Power Research Institute.