An External Fiber Grating Sensor used for Measurement of Interface Pressure between Cable and Accessory at High Temperature

The interface pressure between cable and cable accessory can indicate and greatly affect the safe operation of cable accessory. In this paper, a new temperature compensation method is proposed to eliminate the influence of high temperature on the measurement results, based on the existing method of using fiber grating curvature sensor to measure the interface pressure of cable accessories online at room temperature. First, the fiber Bragg grating curvature sensor using this temperature compensation method was prepared using Dow Corning Sylgard-184 silicone rubber, and then the interface pressure values of 10KV cable accessories at room temperature and high temperature under different expanding ratios were measured. The measurement results show that the measurement deviation of the fiber grating temperature compensation curvature sensor is less than ± 5%, and the accuracy is improved compared with the original temperature compensation method. The interface pressure between cable and accessory gradually increases with the increase of temperature (from 30C to 60C), which are consistent with the measurement results of traditional piezoelectric sensors. It shows that this method is hopeful to be applied to the on-line measurement of the interface pressure of cable accessories under working conditions.