行波故障定位系统中数据采集卡的设计与实现

提出一种用于行波故障定位系统的高速、高精度、多通道同步数据采集卡的设计和实现方法。首先给出了采集卡的总体结构及工作原理，然后详细介绍了采集卡硬件和软件的设计和实现思路。硬件以现场可编程门阵列(field programmable gate array，FPGA)为中央处理器，以高速、高精度、低功耗的模数转换器为信号转换单元，配备先进先出高速缓存，同步动态随机存储器和全球定位系统同步时钟接收模块。软件主要包括FPGA编程和外部设备互连PCI总线驱动程序。该采集卡能实现每路100 MHz的采样速率和16位高精度3路模拟输入的同步采集，并为采集的数据附加时标，可有效解决故障行波的高速、高精度数据采集问题。

Design and Implementation of Data Sampling Card for Traveling Wave Fault Location System

In this paper the design and implementation of a multi-channel synchronous data-sampling card with high-speed and high-accuracy are proposed.At first,the overall structure and working principle of this card are presented;then the design and implementation of hardware and software for this card are described in detail.The field programmable gate array(FPGA) is used as central processor unit and the D/A converter with high-speed,high-accuracy and low-power consumption as signal conversion unit,in addition,the high speed FIFO cache memory,synchronous dynamic random access memory(SDRAM) and synchronizing clock receiver module of GPS are equipped.The software includes the program for FPGA programming and PCI bus device driver.The presented data-sampling card can implement the sampling rate of 100MHz per channel and synchronously sample analog inputs from three channels with 16-bit accuracy,and add the time scale to the sampled data.Thus,the data-sampling problem of fault generated traveling wave with high-speed and high-accuracy is effectively solved.