磁调制式剩余电流传感器的动态励磁过程分析与仿真

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摘要随着智能电网的发展和电力电子设备不断增多,设备故障时产生的剩余电流呈现非线性,本文针对非线性剩余电流传感器的工作过程开展了研究。首先建立了电压型磁调制式剩余电流传感器的动态励磁电流变化过程模型,推导出励磁脉冲电压频率的计算公式,并证明了通过励磁电流的检测可以实现剩余电流的准确测量;其次对动态励磁电流变化过程进行了分析,在剩余电流传感器励磁电流动态变化过程简化计算模型中,通过合理选择饱和电流值可以使励磁脉冲电压频率和励磁电流平均值的计算结果与考虑磁滞情况的结果一致;然后分析了影响磁调制剩余电流传感器工作性能的因素,通过改变传感器的匝数、励磁电压幅值、反转励磁电流等方法可以使传感器满足设计要求;最后通过仿真模型和实际测试,对动态励磁电流变化过程模型进行了验证,考虑磁滞影响的励磁电流动态过程与实际变化过程更吻合。本文对励磁电流动态过程的分析为电压型磁调制式剩余电流传感器的设计提供了依据。

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	武一
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	牛峰
	刘冰月
	任伯飞
	刘友松

关键词 ：磁调制, 剩余电流传感器, 动态励磁过程, 磁滞效应

Abstract：With the development of smart grid and the increase of power electronic devices, residual current presents nonlinear characteristics in the event of faults on these devices. This paper focuses on the study of dynamic characteristics of nonlinear residual current transformer. Firstly the dynamic model is established to describe the changing process of excitation current of the voltage-drive magnetic modulation residual current transformer. And the equations to obtain the frequency of pulsed excitation voltage are derived. Furthermore, it is proved that the residual current can be measured precisely by detecting the excitation current. Secondly, the dynamic process of the excitation current is analyzed and it is found that the reasonable selection of saturated current will lead to agreement in the results of both frequency of pulsed excitation voltage and the mean value of excitation current even if magnetic hysteresis is not considered. Additionally, factors that affect the operating performance of the residual current transformer are analyzed and several measures, such as varying number of turns, tuning amplitude of pulsed excitation voltage and reversing the exciting current, can be taken to make the transformer meet the design requirements. Finally, both simulation and experimental results are presented to verify the dynamic process of excitation current. It is found that the simulation result of dynamic process is more consistent with the actual changing process when magnetic hysteresis is taken into consideration. In conclusion, the analysis of dynamic process for excitation current in this paper lays foundation for the design of voltage-drive magnetic modulation residual current transformer.

Key words： Magnetic modulation residual current transformer dynamic process of excitation current magnetic hysteresis

收稿日期: 2014-01-13 出版日期: 2014-08-05

PACS:

TM52

基金资助:国家自然科学基金（51077038）和河北省高等学校创新团队领军人才培育计划（LJRC003）资助项目

作者简介: 武一女,1964年生,教授,研究方向为电子技术、电器智能化技术。李奎男,1965年生,教授,博士生导师,研究方向为可靠性技术、电器智能化技术。

引用本文:

武一, 李奎, 王尧, 牛峰, 刘冰月, 任伯飞, 刘友松. 磁调制式剩余电流传感器的动态励磁过程分析与仿真[J]. 电工技术学报, 2014, 29(7): 244-252. Wu Yi, Li Kui, Wang Yao, Niu Feng, Liu Bingyue, Ren Bofei, Liu Yousong. Analysis and Simulation of Dynamic Process of Excitation Current of Magnetic Modulation Residual Current Transformer. Transactions of China Electrotechnical Society, 2014, 29(7): 244-252.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I7/244

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