双光纤温度补偿法测量高温下电缆与附件界面压力的方法

Double-optical-fibre Temperature Compensation Method Used for Interface Pressure Measurement Between Cable and Accessory at High Temperatures

电缆与附件的界面压力和电缆附件的安全运行密切相关,为此提出了一种采用光纤光栅温度补偿曲率传感器在线测量高温下电缆附件界面压力的新方法。首先基于光纤光栅传感机理、纯弯曲数学模型、厚壁圆筒模型,选用道康宁Sylgard–184硅橡胶制备了光纤光栅温度补偿曲率传感器,之后测量了不同扩径率下10 kV电缆附件常温和高温下的界面压力值。研究表明:该光纤光栅曲率传感器温度补偿测量偏差为−7.74%~7.01%,随着温度的升高(从30℃至60℃),电缆附件的界面压力值逐渐增大,其测试结果与传统压电传感器的测量结果趋势一致。该方法有望用于评估运行于复杂温度环境下的实体电缆附件界面压力的长期可靠性。

Interface pressure between cable and accessory is closely related to the safe operation of cable accessory.By means of an external optical fibre Bragg grating temperature-compensated curvature sensor,the paper proposed a new method for on-line measurement of interface pressure between cable and accessory at high temperatures.First,based on the fibre Bragg grating sensing mechanism,pure bending mathematical model,and thick-walled cylinder model,a fibre Bragg grating temperature-compensated curvature sensor was fabricated by using Dowcorning Sylgard−184 silicon rubber.Then,the interfacial pressure values of 10 kV cable accessories at room temperature and high temperatures under different expansion rates were measured.The measurement results show that the temperature compensation measurement deviation of the fiber grating curvature sensor is between−7.74%and 7.01%,and the interface pressure between cable and accessory gradually increases with the increase of temperature(from 30℃to 60℃),and the test results are consistent with the measurement results of traditional piezoelectric sensors.This method is hopeful to evaluate the long-term reliability of the interface pressure of cable accessories operating in complex temperature environments.