Research And Application In Power Cable Temperature Monitoring System Using Fiber Grating Sensor

Electricity is one of the important basic energy in industrial society. With the continuous development of the national economy, our demand for power resources has also increased rapidly. With the growing size of the power system, the safety of the cables in power system has become an increasingly important issue, while the management of cables is becoming more and more important.The traditional method of temperature detection cable uses the thermistors and thermocouples as temperature sensors. Usually the temperature sensors are installed in some fixed points in the cables. So the traditional method can only measure the temperature of the fixed points, while the data collected by the sensors can only transmit a certain distance.Meanwhile, in the traditional management mode of the cables, people usually draw distribution map of the cables, and create archives to store the attributes of equipments and the related data. This would consume a significant amount of manpower and resources, and the data cannot achieve real-time updates. Also the method cannot analyze and forecast the related data and ensure the accuracy of the collected data. Because of the various defects it has, the traditional approach cannot meet the requirements of system management, and also the maintenance of the cables has some difficulties.To solve the problem, this paper presents a temperature monitoring system based on WebGIS for power lines. In the system, we use distributed optical fiber grating temperature sensor system to measure the temperature of the cables in a large range. Also, the system presents a WebGIS-based cable management method. We format the temperature data and geographic information data in certain format and store the data in the database. When the user needs some data, the client can present the information required by the user in real time. Also the system can save a lot of human and material resources.This system consists of two parts:data acquisition and data processing. The data acquisition sub-system uses distributed optical fiber grating temperature sensor system to measure the temperature of the cables, and transmits the data to the data processing sub-system. The latter contains three parts:data layer, service layer and client layer. The function of the data layer is storing the temperature data and geographic information data while the main task of the service layer is getting the data from the data layer based on the commands transmitted from client layer and then transmitting the required data to client layer, and the function of the client layer is receiving the orders from users and display the related data in various ways.In this paper we mainly discuss the working principle and the realization of the distributed optical fiber grating temperature sensor system, also we design the data storage format used in data layer. After introducing the principles of data conversion and data processing, we design the client layer using SVG and realize the various functions of the system, such as synchronous detection, real-time data updates, and data display.