As fire accidents in electrical power systems are often caused by device or cable heating

on-line temperature monitoring is an important guarantee for the system security and stability.This paper designs and realizes a high-rate

high precision and low-cost distributed FBG temperature monitoring system suitable for project applications and verifies the temperature response characteristics of the ceramic-packaged FBG sensors.The results show that there is a good linear relationship between the reflective wavelength and temperature of the sensor and a long-term monitoring of the high voltage switchgears shows that this system is highly accurate and fairly stable

appropriate for temperature monitoring in power systems.