Research Of The On-line Temperature Monitoring System Of Power Cable Based On FBG

The status of power cable in urban power system is the problem that attracts the most attention. Cable faults are responsible for breaking down the power supply system. Its temperature is an important parameter to reflect the running status of cable. When load or environmental temperature increased, the temperature of cable joint will rise. The cable joint may explode when the temperature is over critical value. More seriously, that may lead to great power failure or fire. The on-line temperature monitoring system can easily monitor the real-time status of cable, timely alarm, and can effectively avoid cable fire accident and reduce the economic losses.Based on the analysis of temperature monitoring methods, this paper compared the advantages and disadvantages of point sensing technology, linear sensing technology and thermal effect sensing technology. Then an on-line temperature monitoring system of power cable based on FBG is proposed. This system makes full use of the characteristics of optical fiber sensor technology. It also uses geographic information system, network programming and multi-threading technology. This system has high real-time and provides a user-friendly graphical interface. It can meet the engineering needs and has good prospectsIn order to meet the system handle the volume of data and real time features this paper adopts C/S architecture, the software part contains client modulate and monitoring center modulate. The client modulate collects real time data through the serial port, and then the disposed data is sent to monitoring center through the network. The monitoring center provides various functions by using these data.The main contents of this paper are as follows:Firstly, the temperature sensing properties and strain sensing characteristics of fiber grating sensors is studied and the popular wavelength demodulation technology is introduced.Secondly, the overall structure of system is analyzed; then the detail of system design and implementation is present. The paper analyses the difficult problems that occurred in the design process and provides technical solutions. Such as:MapX control used to realize location of geographic information; Winsock network programming used to realize data network transmission function, Multithread technique used to solve the problem of mass data acquisition and processing, and DLL technology used to finish calculation module.Finally, the design and realization of this system is summarized and prospected.