Study on Temperature Measurement Technology of Oil Immersed Transformer and Associated Prony Algorithm

In the paper the measurement program of transformer winding temperature was proposed by using the fluorescence lifetime. We produced a probe to measure the temperature of the oil immersed transformer winding and used high temperature fiber to transfer fluorescence. Three methods were used to calculate the fluorescent life. By comparing advantages and disadvantages of three methods, the Prony algorithm was selected .Because it can fit multi-exponential and improve the accuracy of temperature measurement which is suitable for the fluorescence curve. At the same time, the calibration experiments of the measured temperature were carried out to achieve a real-time measurement of oil temperature.