A Novel Temperature Monitoring System Based on FBG for Switchgear

To satisfy temperature monitoring of high voltage (HV) switchgear cabinet, a novel temperature monitoring system based on Fiber Bragg Grating (FBG) is developed in this paper. The principles of Fiber Bragg Grating sensor and its temperature characteristics are introduced. Two calibration methods are used to improve the accuracy of the sensor. A temperature monitoring system based on FBG for HV switchgear cabinet is designed. FBG is used to detect temperature and optical fiber is utilized to transport signals. The monitoring system has been successfully used in monitoring the contacts temperature of HV switchgear cabinet. The experimental results indicate that FBG sensors can measure the contact point temperature for a long time and satisfy the demand in measurement range, measurement precision and anti-high voltage interference. The problem of temperature measurement in high voltage and strong magnetic field environment is solved.