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

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?%.