Distributed temperature detection of transformer windings with externally applied distributed optical fiber

摘要

The local overheating fault of power transformer winding threatens the safe, stable operation of a power system. Conventional winding temperature detection methods are point-type temperature measurements, and the hotspot position and the temperature distribution on the winding cannot be accurately obtained. A distributed temperature measurement method of transformer winding based on Raman scattering was thus proposed, and a fiber composite winding model was designed. The influence of fiber on electric field distribution and temperature transfer in oil was simulated, and the insulation performance of fiber composite winding was studied. The distributed optical fiber temperature measurement platform was built, and a temperature sensing test was conducted. The results show that the distributed temperature detection system of transformer winding has high temperature sensing and positioning performance with temperature measurement error less than 1 degrees C and positioning accuracy error within 1.2 m. This means that this method can satisfy the requirements of transformer winding temperature measurement and provide a new, to the best of our knowledge, approach for online monitoring of high-power equipment. (C) 2019 Optical Society of America