Abstract
The online temperature monitoring of high voltage switchgear is of great significance to the safe operation of power system. However, the sensitive signal of the traditional active temperature sensor is electrical signal, which is susceptible to the interference of external electromagnetic signals, resulting in a decrease in accuracy. The sensitive signal of fluorescent optical fiber temperature sensor is optical signal, which is completely insulated from the external electromagnetic signal. In addition, the optical signal is safer than the electrical signal in the high-voltage field. Therefore, the fluorescence optical fiber temperature sensor based on the principle of photoluminescence for high-voltage switchgear is realized in this paper. The Fast Fourier Transform (FFT) algorithm is used by the sensor to calculate the fluorescence lifetime. The experimental data show that when the temperature increases from 29 ℃ to 102 ℃, the fluorescence lifetime decreases from 2.6864 ms to 2.2246 ms, and the temperature sensitivity is about 6 us/℃. The fluorescence lifetime has a good linear relationship with temperature. In summary, the fluorescent optical fiber temperature sensor has application value in the field of high voltage switchgear.
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