宽范围交流大电流高准确度测量方法研究  

Research on method of measurement wide range AC current with high accuracy

作　　者：陈鹏[1] 陆俭国[1] 李新[1] 杨彦杰[1] 

机构地区：[1]河北工业大学,天津300130

出　　处：《电工电能新技术》2006年第3期21-24,28,共5页Advanced Technology of Electrical Engineering and Energy

摘　　要：在继电保护系统中常需测量一次侧大电流。电力系统中,一次侧电流变化范围很大,传统的方法难以满足要求。将Rogowski线圈和数字信号处理技术有机地结合,实现了在大电流范围内进行高准确度的测量。Rogowski线圈不饱和特性使之能够测量大范围的电流,结合数字信号处理的无零漂积分器的测量方法,消除了模拟信号调理电路的零点漂移,并把其非线性因素影响降低到比较低的水平,它测量大电流具有较高的准确度,实现简单,是一种测量宽范围变化的交流电流的较为理想的选择。Usually, in relay protection system, measurement of wide range AC current is inevitable. This paper analyzes the measuring principle of AC current based on Rogowski coil and digital signal processing. Unsaturated characteristic of Rogowski coil makes it suitable for measurement wide range AC current, and with digital signal processing technology, this measurement principle can eliminate the zero drift, nonlinear error and capacity leakage. We have done some experiments with it, and it is proved that its characteristic is very good and gets good results. Adopting this principle, it is possible to measure wide range AC current precisely and simply.

关 键 词：继电保护 ROGOWSKI线圈 零点漂移 数字积分器 

分 类 号：TN957.51[电子电信—信号与信息处理]