一种新型磁放大器式直流电流比较仪  

A New Type of DC Current Comparator with a Magnetic Amplifier

作　　者：揭秉信[1] 陈宁安[1] 徐恳[1] 

机构地区：[1]华中科技大学电力工程系

出　　处：《华中科技大学学报（自然科学版）》2001年第3期1-3,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

摘　　要：研究了一种新型直流电流比较仪 ,它包括两个环节 :双向自饱和磁放大器和双铁芯自饱和磁放大器 .前者为敏感元件 ,后者为功率放大器 ,由此构成一闭环系统 ,其中并有一特殊补偿绕组 ,用以改善量程低端的计量特性 .仪器结构简单 ,稳定可靠 ,初始电流极小 ,在 10 %～ 10 0 %额定电流范围内 ,读数的相对误差不超过0 .2 % 。A new type of DC current comparator is researched which includes two parts: a bidirectional self saturating magnetic amplifier and a two care self saturating magnetic amplifier. The former is used as a sensor, and the latter as a power amplifier which are constituted a closed loop system. In the system there is a special compensation winding in order to improve its metering performance in the low side of measurement range. The instrument has the following characteristics such as: simple construction; well stability and reliability; very small inital current; a relational error of reading value exceeding 0.2?% in range of rated current 10?%～100?%.

关 键 词：电流测量 直流电流比较仪 磁放大器 线路结构 工作原理 补偿绕组 

分 类 号：TM933.12[电气工程—电力电子与电力传动]