Wang Shuchao, Wan Fu, Zhao Hong, Chen Weigen, Zhang Weichao, Zhou Quan
State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New Technology (Ministry of Education), School of Electrical Engineering, Chongqing University, Chongqing 400044, China.
State Key Laboratory of Engineering Dielectrics and Their Applications, School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China.
Sensors (Basel). 2019 Apr 12;19(8):1755. doi: 10.3390/s19081755.
Currently, in the modern power industry, it is still a great challenge to achieve high sensitivity and uninterrupted-online measurement of large current on the high voltage gridlines. At present, the fiber grating current sensors based on giant magnetostrictive material used in the modern power industry to achieve uninterrupted-online measurement of large currents on high voltage grid lines is a better method, but the sensitivity of this current sensor is relatively low, therefore, it is key to improve the sensitivity of this current sensor. Here we show a sensitivity-enhanced fiber grating current sensor based on giant magnetostrictive material (in the following, simply referred to as the sensitivity-enhanced fiber grating current sensor) that is able to achieve high sensitivity and uninterrupted-online measurement of large currents by means of pressurizing the giant magnetostrictive material. Sampling the power frequency sinusoidal alternating current signals with the amplitudes of 107, 157 and 262 A respectively, based on realistic factors, for the sensitivity-enhanced current sensor, the sensitivities, compared with that of the traditional fiber grating current sensor based on giant magnetostrictive material (in the following, simply referred to as the traditional fiber grating current sensor), were respectively enhanced by 268.96%, 135.72% and 71.57%. Thus the sensitivity-enhanced fiber grating current sensor allows us to solve the issue of high sensitivity and uninterrupted-online measurement of large currents that have been plaguing the power industry in a very simple and low-cost way.
当前，在现代电力行业中，要在高压电线上实现大电流的高灵敏度和不间断在线测量仍是一项巨大挑战。目前，现代电力行业中用于实现高压电线上大电流不间断在线测量的基于巨磁致伸缩材料的光纤光栅电流传感器是一种较好的方法，但这种电流传感器的灵敏度相对较低，因此，提高这种电流传感器的灵敏度是关键。在此，我们展示了一种基于巨磁致伸缩材料的灵敏度增强型光纤光栅电流传感器（以下简称灵敏度增强型光纤光栅电流传感器），它能够通过对巨磁致伸缩材料施加压力来实现大电流的高灵敏度和不间断在线测量。基于实际因素，分别对幅值为107、157和262A的工频正弦交流电流信号进行采样，对于该灵敏度增强型电流传感器，与传统的基于巨磁致伸缩材料的光纤光栅电流传感器（以下简称传统光纤光栅电流传感器）相比，其灵敏度分别提高了268.96%、135.72%和71.57%。因此，灵敏度增强型光纤光栅电流传感器使我们能够以非常简单且低成本的方式解决一直困扰电力行业的大电流高灵敏度和不间断在线测量问题。
