高精确度交流电流测试仪的设计  

Design of Alternating Current Testing Instrument with High Accuracy

作　　者：朱武[1] 瞿长春[2] 操瑞发 赵莎[3] 

机构地区：[1]上海电力学院计算机与信息工程学院,上海200090 [2]上海市电力公司教培中心,上海200438 [3]中国电力科学研究院,北京100085

出　　处：《上海电力学院学报》2008年第2期107-110,共4页Journal of Shanghai University of Electric Power

基　　金：上海市科学技术委员会地方高校能力建设项目(071605125)

摘　　要：介绍了一种宽量程范围的交流电流测试仪的工作原理及设计方法．该仪器采用双级电流互感器作为电流分流器，采用对数-反对数放大器实现交流电流真有效值转换，采用超线性度模／数转换器实现数字采样．实验结果表明，在45—65Hz频率范围内实现了线性度达到0．02％交直流有效值的测量．The principle and design method of alternating current testing instrument with wide rang is introduced. In this instrument, two-stage current transformers are used as current shunt, logantilog amplifiers are used to perform true rms-to-dc conversion, and rms voltage is sampled by ultra-linear analog to digital converter. There is not any adjustable element in the circuit because of advanced auto-calibration introduced. Experimental results show that the linearity of rms-to-dc conversion is up to 0.02% in the range from 45 Hz to 65 Hz.

关 键 词：真有效值 双级电流互感器 模数转换 

分 类 号：TM933.13[电气工程—电力电子与电力传动]