Details

This thesis investigates the use of an FBG-based optical fiber sensing system for vibration measurement near high-voltage equipment. The work includes static calibration of the FBG sensor, high-voltage feasibility testing, fan vibration experiments, artificial imbalance testing, FFT analysis, standard deviation evaluation, and final measurement under a 12 kV high-voltage surface discharge condition. The static calibration confirmed that the Bragg wavelength increased almost linearly with applied tensile force. In the fan experiments, the system recorded vibration signals under normal and artificial imbalance conditions. FFT analysis showed a low-frequency component around 140 ± 10 Hz related to artificial imbalance and a high-frequency component around 4.9–5 kHz related to fan and blade vibration. The standard deviation increased from 0.10533 V to 0.18951 V at 12 V after artificial imbalance was introduced. In the final 12 kV experiment, the fan was not used. The CH2 signal showed regular vibration-related fluctuations caused mainly by bending of the flexible insulating film with the FBG and partly by acoustic waves from surface discharge. The results confirm the feasibility of using optical fiber sensing for vibration monitoring near high-voltage equipment.