Rogowski线圈的FBG电流传感器研究

电流是电力设备进行计量、监控和保护的重要参量,对其准确测量是电力系统安全、稳定、可靠和经济运行的保证。研制了一种Rogowski线圈、叠堆压电陶瓷和光纤Bragg光栅组合成的测量大电流的电流传感器。利用Rogowski线圈把高压侧大电流线性地转换为低电压,输出电压加在叠堆压电陶瓷上,由逆压电效应,叠堆压电陶瓷伸缩带动光纤Bragg光栅伸缩,将叠堆压电陶瓷的应变线性转换为光纤Bragg光栅的中心反射波长的移位,增加温补光栅消除环境温度的影响,通过测量光纤Bragg光栅中心反射波长的移位来测量电流的大小。测试结果表明,该电流传感器的灵敏度为0.071 8pm/A,非线性误差为3.47%FS,滞后误差为4.17%FS,重复性误差为4.17%FS。

Research of FBG Current Sensor Based on Rogowski Coil

Current intensity is an important parameter of power equipment measurement, monitoring and protection, accurate measurement of the current intensity is the guarantee to the safeness, stableness and reliability of power system and its economic operation. A current sensor for measuring high current was developed, which a Rogowski coil, stacks of piezoelectric ceramic and fiber Bragg grating were combined together. Rogowski coil was used to put high pressure side heavy current into low voltage linearly. The output voltage was added to the stack of piezoelectric ceramic. The combined fiber Bragg grating was telescopic driven by piezoelectric ceramic stack because of the effect of inverse piezoelectric. The linear strain of piezoelectric ceramic stack was converted to the replacement of center reflective wavelength of the optical fiber Bragg grating. Temperature compensation to the fiber Bragg grating was added to eliminate the influence of environment temperature. The measurement of shift of the reflection wavelength of the fiber Bragg grating was used to measure the current. The test results showed that the sensitivity of the current sensor was 0.071 8 pm/A, the nonlinear error was 3.47% FS, the hysteresis was 4.17%FS and the repeatability was 4.17% FS.