【作者】 单伟；

【导师】 郑绳楦；

【作者基本信息】 燕山大学 ， 电路与系统， 2004， 硕士

【摘要】 电流互感器作为电力系统中的重要设备，对电力系统的正常运行和电力的精确计量有非常重要的作用。随着国民经济的发展，新的供电电压等级不断提高，系统的测量和保护精度要求不断提高，新型光电式电流互感器替代传统的电磁式电流互感器是必然的趋势。干涉式光纤电流传感器集现代电子技术和光学技术于一体，以其高精度、高可靠性、宽响应带宽等特点已逐渐为电力工程领域所接受。本文针对目前电力工业对电流互感器的要求，设计了一种新型的将偏振光干涉技术和传感技术相结合的高压干涉式光纤电流传感器。与混合式光纤电流传感器的研究方案相比较，本系统避开了高压端电源等难点。系统结构简单，动态测量范围大，对外界缓变量（如温度）的影响不敏感。本文精心设计了电子线路部分。文中设计了带通滤波器、低通滤波器，并进行了详细地分析。本课题利用最新的数字信号处理技术，实现了数字正交解调。详细阐述了各部分的组成和工作原理。论文在器件的选用、信号处理和软件算法等方面都作了深入的研究，力求精简电路并提高测量精度。采用可编程逻辑器件实现整个工作电路的时序发生和同步协调工作。最后对文中方案进行了深入分析，采用这种方法设计的干涉式光纤电流传感器工作可靠，电路和光路简单。更多还原

【Abstract】 As important equipments in electric power industry, current transducers play a primary rolefor working well and calculating precisely in power supplying system. With the development ofnational economy, new high voltage level emerges continuously, and high accuracy ofmeasurement and protection are demanded increasingly. It is an absolute trend that novel opticalcurrent transducers substitute the old electromagnetic current transformer. Based on modernelectronics technology and optics technology, fiber-optic interferometer current sensors havealready been accepted by electric power engineering because of attractive characteristics of highaccuracy, high reliability and wide bandwidth. In order to satisfy the demands for electric current transducer in modern electric powerindustry, this issue describes a novel fiber-optic interferometer current sensor, which combinespolarized-light interference technology with fiber sensing technology. Compared with the hybridfiber-optic current transducers, novel current sensors don’t need special power supply forhigh-voltage unit. The advantages of the sensor are simple structure, wide dynamic range andbandwidth, especially insensitive to temperature and vibration. This issue designs band pass filter and low pass filter. The digital demodulation is realized byuse of recent digital signal processing technology. Much research has been made on the devicesselection, signal processing and software design. The whole circuit’s timing generation andsynchronization are realized with the complex programmable logic device. At last, the analysis about this interferometer current sensor is described. The current sensorwe designed is much better than traditional current transducer.更多还原