349 / 2019-03-14 11:00:32

Temperature Monitoring of Distribution Transformer Windings Based on Fiber Bragg Grating Array

fiber Bragg grating; distributed temperature monitoring; distribution transformer; finite element simulation; hot spot temperature

Abstract—During the operation of distribution transformers, the windings will have temperature rise hot spots, which may accelerate insulation aging and decrease service life of the transformers. Monitoring of hot spot temperature is important to ensure safe operation of the transformer. In order to realize accurate monitoring on winding temperature, the paper presents a distributed temperature measurement system for power transformer based on fiber Bragg grating (FBG). Firstly, the principle of the FBG temperature measurement is introduced. Then, temperature distribution of a 10 kV distribution transformer is simulated based on finite element simulation method. Hot spot locations of the windings are obtained. After that, the manufacturing techniques are improved, and a distribution transformer prototype with FBGs is developed. Finally, temperature rise tests under the rated load are carried out to investigate the efficient of the proposed system. The experiment results indicate that the winding hot spot distribution is in consistent with the simulation result, the proposed optical system can be used in the field transformer monitoring.