磁调制零磁通电流传感器状态监测方法

doi:10.3969/j.issn.1001-2400.2018.03.029

摘要/Abstract

摘要：

磁调制零磁通电流传感器凭借其优良特性，广泛应用在供电设备和用电设备上．智能电网、智能电器和大数据的快速发展对传感器的工作状态监测需求日益强烈．为获得电流传感器的状态特征信息，文中利用铁磁材料磁导率随磁场强度(电流)变化的规律，提出一种磁调制分析方法．该方法既能避开三折线分析磁调制的不足，又能获得各参数之间的清晰关系．文中以零磁通电流传感器的磁调制解调为基础，运用傅里叶级数分析调制解调信号携带的频率成分，通过比对零磁通状态和非零磁通状态调制、解调包含的频率成分，确定了反映磁调制正常工作与否的关联频率分量;文中结合零磁通电流传感器工作原理，提出了一种判断磁调制式零磁通电流传感器工作状态的基本方法．实验电路验证了文中所述磁调制特征信息与零磁通电流传感器工作状态之间的关系，实验结果与文中推论一致．

关键词: 电流传感器, 零磁通, 调制, 状态, 磁调制特征

Abstract:

The magnetic modulation zero-flux current sensor, with its excellent characteristics, is widely used in both power supply and power consumption equipment. The rapid developments of the smart grid and big data lead to a remarkable increase in the demand for monitoring the working status of the sensor. To obtain the state feature information of the current sensor, this paper proposes a magnetic modulation analysis method based on the fact that the permeability of ferromagnetic materials varies with the strength of the magnetic field (or current). This method not only circumvents the shortcomings of magnetic modulation with trilinear analysis, but also is able to obtain clear relations among all parameters. Based on the fundamental principle of the zero-flux, the Fourier series is employed to analyze the frequency components carried by modulation and demodulation signals. By comparing the spectrum of modulation and demodulation signals with both zero and non-zero flux, the relevant frequency components indicating the working status of magnetic modulation are determined. According to the working principle of the zero-flux current sensor, a basic method is proposed to judge the working status of the magnetic-modulation-style zero-flux current sensor. The relation between the magnetic modulation feature information and the working status of the zero-flux current sensor is validated with real circuits, and the experimental results coincide with the inference.

Key words: current sensor, zero flux, modulation, states, magnetic modulation characteristic

王东兴;朱燕燕;李瑞;李德明. 磁调制零磁通电流传感器状态监测方法[J]. 西安电子科技大学学报, 2018, 45(3): 169-174.

WANG Dongxing;ZHU Yanyan;LI Rui;LI Deming. States monitoring method for zero-flux current sensor based on magnetic modulation[J]. Journal of Xidian University, 2018, 45(3): 169-174.

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