外置光纤光栅传感器测量电缆附件界面压力的方法研究  

External Fiber Grating Sensor Used for Measurement of Interface Pressure Between Cable and Accessory

作　　者：王霞[1] 樊卓杨 吴超[1] 吴锴[1] WANG Xia;FAN Zhuoyang;WU Chao;WU Kai(State Key Laboratory of Electric Insulation and Power Equipment,Xi'an Jiaotong University,Xi'an 712000,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安712000

出　　处：《高电压技术》2022年第1期38-46,共9页High Voltage Engineering

基　　金：国家自然科学基金(52077171)。

摘　　要：电缆与附件的界面压力是确保电缆附件长期可靠运行的关键。迄今为止,电缆与附件界面压力的测量方法均为内置压电传感器的离线式测量。该方法操作困难,对电缆与附件界面具有一定的破坏性,且离线式测量不能实时反映电缆附件运行过程中面压的变化特性。因此,提出了一种外置光纤曲率传感器在线测量电缆与附件界面压力的新方法。基于纯弯曲理论制备得到光纤曲率传感器,建立了电缆附件外曲率-径向位移-内界面压力间的关系模型,最后通过标定后的光纤曲率传感器,测量了10 kV电缆附件在不同扩径率下的界面压力值。测量结果表明:该光纤曲率传感器能够实现附件外曲率的精确测量,可测曲率范围0.033~0.05 mm^(-1),电缆附件界面压力的测量结果与传统压电传感器的测量结果基本一致。Interface pressure between cable and accessory is the key to ensure the long-term reliable operation of cable accessories.So far,the measurement method of interface pressure is the off-line measurement with the built-in piezoelectric sensor.However,this method not only is difficult to operate,but also damages the interface structure,and the off-line measurement cannot reflect the dynamic changes of interface pressure during the operation of the cable accessory in real time.Therefore,in this paper,a new method for on-line measurement of interface pressure between cable and accessory was proposed by means of an external optical fiber curvature sensor.Based on the pure bending theory,the optical fiber curvature sensor was prepared.Then the relationship model among the outer curvature of the cable accessory,the radial displacement and the inner interface pressure was established.Finally,the interface pressures of 10 kV cable accessories under the different expansion ratios were measured by the calibrated optical fiber curvature sensor.The measurement results show that the optical fiber curvature sensor can be adopted to measure the external curvature of the accessory accurately,and the measurable curvature ranges from 0.033 mm^(-1)to 0.05 mm^(-1).The measured results of the interface pressure of the cable accessory are basically consistent with the results of traditional piezoelectric sensor measurement.

关 键 词：电缆附件 界面压力 光纤传感 在线测量 纯弯曲 厚壁圆筒 

分 类 号：TM75[电气工程—电力系统及自动化] TP212[自动化与计算机技术—检测技术与自动化装置]