【作者】 林森；

【导师】 杜林；

【作者基本信息】 重庆大学 ， 电气工程， 2010， 硕士

【摘要】 随着电力系统电压等级和容量的不断提高以及数字化变电站的发展,传统电流传感器越来越难以适应电力系统的要求。光学电流传感器具有体积小、成本低、运行安全可靠、适应数字化变电站要求等优点,成为人们重点研究的对象。光学电流传感器原理各有不同,也各有优缺点。但是,综合各种原理的光学电流传感器,发现磁光介质是制约其发展的最大瓶颈。另外,已有光学电流传感器的研究,鲜有对其响应特性进行系统研究。故本文采用MR3-2新型磁光玻璃和铁磁流体两种新型磁光介质,对基于法拉第磁光效应的光学电流传感器响应特性进行系统研究。本文首先介绍了法拉第磁光效应的基本原理和相关理论。对法拉第磁光效应的经典理论和顺磁性物质的法拉第磁光效应的量子理论做了重点介绍。根据马吕斯定律,对基于法拉第磁光效应的光学电流传感器的响应特性进行了仿真。主要包括:交流正弦激励下响应的波形、响应的幅值特性和频率特性;方波激励下响应的波形和幅值特性。通过仿真,得到了合适的参数和条件,为实验中参数的确定提供了依据。建立并介绍了本文采用的基于法拉第磁光效应的光学电流传感器实验平台。对实验平台中重要器件的参数进行了计算和说明。为进一步改进实验平台提供了有效的依据。最后,基于上述实验平台,采用MR3-2新型磁光玻璃和铁磁流体两种磁光介质,对基于法拉第磁光效应的光学电流传感器的响应特性进行了实验研究。主要包括:交流正弦激励下响应的波形、幅值特性和频率特性;方波脉冲激励下的响应波形;交流正弦激励下响应的温度特性。通过实验数据的分析,找到了铁磁流体“倍频”现象的原因。提出了一些实验平台和磁光介质参数的改进措施,并对两种磁光介质的不同特点做了分析。更多还原

【Abstract】 With the voltage level and capacity development of the power system and the development of digital substation, the traditional power current sensor is increasingly difficult to adapt to system requirements. Optical current sensor with small size, low cost, safe and reliable operation to meet the requirements of digital substations etc., become the object of research focus. Optical current sensors have different principle, advantages and disadvantages also. Still, magneto-optical medium is found in the greatest bottleneck constraining the development of optical current sensors which have different principle. In addition, there are few research of response characteristics. Therefore, this paper uses two new magneto-optical media, MR3-2 new magneto-optical glass and ferrofluid, do system research of response characteristics of the optical current sensor based on Faraday magneto-optical effect.At first, the basic principles of Faraday magneto-optical effect and the related theories have been introduced, focuses on the classical theory of Faraday magneto-optical effect and quantum theory of Faraday magneto-optical effect of Paramagnetic material.Secondly, the response characteristics of the optical current sensor based on Faraday magneto-optical effect have been simulated according to the Malus Law. Include: Waveform of response, Amplitude characteristic, Frequency characteristic in AC sine wave excitation; Waveform of response, Amplitude characteristic in square excitation. The simulation can provide appropriate parameters and conditions, and basis is provided for determining the parameters of experiment.Then, the experiment platform of the optical current sensor based on Faraday magneto-optical effect in this paper has been introduced and established. Parameters of important devices in this experimental platform have been calculated and introduced. To further improve the experimental platform provides an effective basis.Finally, based on the experimental platform, with the MR3-2 magneto-optical glass and ferrofluid, response characteristics of the optical current sensor based on Faraday magneto-optical effect were studied. Include: Waveform, Amplitude characteristic and Frequency characteristic of response in AC sine wave excitation; Waveform of response in square impulse excitation; Temperature characteristics of response in AC sine wave excitation. Through the analysis of experimental data, found the reason of "frequency multiplication" phenomenon in ferrofluid.Made a number of improvements of experimental platforms and the magneto-optical medium parameters, and the different feature of two kinds magneto-optical medium were analyzed.更多还原