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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.
Highlights
With the rapid development of the whole power industry, the highly automated and intelligent requirements of the current measurement system and the electrical appliances protection system are constantly increasing, the measurement of large currents has become an urgent problem to be solved [1,2,3,4,5,6,7,8,9,10,11,12,13]
Sensors 2019, 19, 1755 fiber current sensor technology is applied in the power industry to achieve uninterrupted-online measurement of large current on the high voltage grid lines has gradually become the mainstream of the current power industry [9,10,11,12,13]
The optical fiber current sensor has many advantages, for example, this current sensor doesn’t produce magnetic saturation and ferromagnetic resonance, and at the same time, it has a large dynamic range, which enables this current sensor to produce a high linearity response over a large dynamic range, besides, the sensor has the advantages of anti-electromagnetic interference, good insulation, small size, lightweight and so on, more importantly, there is no danger of high voltage caused by secondary open circuit and oil leakage and explosions of this traditional oil-filled current sensor [11,12]
Summary
With the rapid development of the whole power industry, the highly automated and intelligent requirements of the current measurement system and the electrical appliances protection system are constantly increasing, the measurement of large currents has become an urgent problem to be solved [1,2,3,4,5,6,7,8,9,10,11,12,13]. The mainstream optical fiber current sensors for uninterrupted-online measurement of large currents on high voltage gridlines mainly include three types, namely, the photoelectric hybrid current sensor, the current sensor based on Faraday magneto-optical effect and the current sensor based on giant magnetostrictive material [5,6,7,8,9,10,11,12,13]. Among these three types, the optical fiber current sensor based on giant magnetostrictive material shows more advantages than another two types of current sensors. For the photoelectric hybrid current sensor, there is no better solution to the power supply problem of high-potential electronic circuit and the reliability problem of electronic circuit [11]
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