Design of Transformer Temperature Measurement System Based on Fiber Grating

Abstract

This paper expounds the hardware and software system design for the transformer temperature measurement based on optical fiber grating. According to the linear relationship between the Bragg grating center wavelength and temperature, the FBG-T-01 optical fiber sensors constitute a sensor array through the WDM principles. And the tunable release-pearl ROM cavity (F-P) filtering demodulation method is used for wavelength detection. On the basis, the polynomial fitting algorithm for peak is proposed. The software system could find anomaly problem of transformer winding problem timely. The measurement point temperature and the temperature rise rate both are the criterions to judging transformer winding temperature normal or not. The experimental results show that optical fiber grating temperature measuring system is accurate and stable. It can perform the transformer temperature measurement task favourably.