Abstract
This paper puts forward a power cable on-line measurement system which is based on fiber Bragg grating. Firstly the paper analyzes several solutions to cable lines temperature measurement, then the best solution to cable temperature measurement should be chosen from characters and defects of these temperature measurements. Due to the characters and merits of fiber Bragg grating such as high sensitivity, insensitive to the electromagnetic interference and lower cost than BOTDR, a cable lines temperature measurement which is based on fiber Bragg grating has been applied to engineering application. On the basis of temperature measurement principle of fiber Bragg Grating, the power cable on-line measurement system consists of FBG sensing system, FBG demodulator, multi-channels wireless acquisition and transmission terminal, and data publishing system. This measurement accuracy is relatively high, the temperature test in laboratory acrosscable line is analyzed, the maximum absolute error is 0.05°C; the maximum relative error is 0.2%. Moreover, along period of time and multiple channels engineering application, the monitoring system proposed in thepaper provides a feasible scheme for the on-line monitoring of underground and submarine cable. All the results shows that the fiber Bragg grating sensing system could be used for the on-line temperature monitoring on the power transmission lines and provide technical support for the smart grid, and this FBG on-line monitoring system will have a broad prospect in engineering application.
