A Sensitivity-enhanced Fiber Grating Current Sensor Based on Giant Magnetostrictive Material for Large-Current Measurement

Abstract

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.

Optical Fiber Current Sensors Based on FBG and Magnetostrictive Composite Materials

“…Geometry TD Mass Linear Range [13] Cylindrical 40 250-700 A [14] Toroidal 144 320-900 A Wang et al [20] proposed a fiber grating current sensor with enhanced sensitivity based on giant magnetostrictive material. When subjected to preloading stress, GMM sensitivity to magnetic field increases significantly.…”

“…The cost is the lowest, the magnetic flux density is concentrated and the maximum non-linear error of the sensor is reduced, but the temperature error is not compensated. S. Wang [20] 1. The T-shaped structure is placed in the copper support structure 2. the copper screw exerts pressure Sensitivity is enhanced, but the structure is complex.…”

Construction and Numerical Realization of a Magnetization Model for a Magnetostrictive Actuator Based on a Free Energy Hysteresis Model

“…(2) Magnetostrictive mechanism Specifically, there are three reasons to change the magnetization state of the ferromagnetic material by changing the shape and volume of ferromagnetic materials [18,19]. The main effect of magnetostrictive strain on giant magnetostrictive material is field-induced deformation [20].…”

Structural optimization of magnetostrictive composite materials in magnetostrictive current sensor

“…In addition to the preparation of materials to enhance the performance of the sensor, Wang et al developed a sensitivityenhanced fiber grating current sensor based on giant magnetostrictive material through specially designed structure of probe [25]. Dante et al proposed an open-loop structure sensor and shortened the magnetostrictive composite material to 1 mm [26].…”