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Abstract
Measurement of DC current is critically important in a wide range of applications, such as in photovoltaic power generation and DC power transmission. In this paper, the DC current measuring method based on magnetic fluids with orthogonal magnetic fields is studied. Firstly, the induced voltage of measurement coil, which contains a series of harmonics and the amplitude of its fundamental component is 2.5 times larger than that of other components, is derived and analyzed. Then, influence factors of the induced voltage are systematically studied. As a result, with a DC component injection into the exciting current, the frequency of the induced voltage becomes a half of that without a DC component, and when the DC component reaches to or exceeds the amplitude of the AC component, the induced voltage nearly has no distortion. Finally, the input-output characteristic of the measurement method is examined, and the accuracy, measuring range, and sensitivity are discussed, indicating that the linearity of the foundamental component root mean square (RMS) value curve is better than the one of the voltage amplitude curve under the same DC current range, and the sensitivities of induced voltage amplitude and the fundamental component RMS value are 5.948 and 3.717 mΩ, respectively.
Highlights
With the development of photovoltaic power generation, DC power transmission,[1,2,3] DC distribution, railway application,[4] as well as for further improving the efficiency of DC/AC energy conversion,[5] DC power generation technology has received intensive attention recently
This study provides a new method for measuring DC current, the induced voltage in measurement coil is not derived and analyzed, and the input-output characteristic is not studied, both of which are crucial for a DC current measurement
This paper systematically studied the characteristics of the method, including induced voltage waveform features, influence factors, harmonic analysis, and the input-output characteristics, which provide new thoughts for experimental research on the DC current measuring method, and theoretical guidance for the optimal design of a DC current sensor
Summary
With the development of photovoltaic power generation, DC power transmission,[1,2,3] DC distribution, railway application,[4] as well as for further improving the efficiency of DC/AC energy conversion,[5] DC power generation technology has received intensive attention recently. Magnetic fluid is a solid-liquid mixture system, in which the strong magnetic particles are mixed into the base carrier liquid, and surfactant is added to disperse the magnetic particles in the base carrier liquid uniformly This kind of materials have good magnetization characteristics,[20,23,24,25] and, recently, the characteristics of a magnetic fluid under an orthogonal alternating magnetic field is studied, and a model of a magnetic fluid under an orthogonal alternating magnetic field is proposed.[23] This study provides a new method for measuring DC current, the induced voltage in measurement coil is not derived and analyzed, and the input-output characteristic is not studied, both of which are crucial for a DC current measurement.
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