具有高功率输出接口的罗氏线圈电流互感器  

Rogowski Coil Current Transformer with High Power Output Interface

作　　者：梁汉祥 张冈[2] 黄莹 

机构地区：[1]武汉天瑞自控技术有限公司,武汉430060 [2]华中科技大学机械科学与工程学院,武汉430074

出　　处：《电测与仪表》2013年第S1期122-125,共4页Electrical Measurement & Instrumentation

摘　　要：罗氏线圈以其高精度、良好的线性度以及不饱和等显著优点,在电流测量领域显现出广阔的应用前景,尤其是在工频大电流和脉冲电流的测量方面更是独占鳌头。但它的输出信号通常为模拟电压或数字脉冲信号,而工业现场大量使用的测控仪表和继电保护装置所接受的信号均为1A或5A的模拟电流信号,这就极大地限制了罗氏线圈电流互感器的使用范围。本文介绍的具有高功率输出接口的罗氏线圈电流互感器,采用了高精度的单片集成功率放大器OPA548,既具有常规罗氏线圈的优点,又可输出0~1A模拟电流信号,可与常规测控仪表和继电保护装置联接。Rogowski coil has a promsing appliction in current measurement because of its unique features, such as high sensitivity, excellent linearity and unsaturated characteristic. It plays a very important role especially in the measure-ments of 50/60Hz large currents and pulsed currents. But the output signal of Rogowski coil is often analog voltage signal or digital pulsed signal, considering that the rated input signal of many widely-used measurement/control instru-ments and relay protection devices is 1A/5A analog current signal, it restricts the application of Rogowski coil to some extent. The novel Pogowski coil current transformer with a high power output interface is present here. A high-preci-sion single-chip integrated power amplifier OPA548 is adopted in it, therefore this kind of Rogowski coil current trans-former not only has features of traditional Rogowski coil, but also output 0 -1A analog current signal which can be connected with widely-used tranditional measurements and relay protection device directly.

关 键 词：罗氏线圈 高功率输出接口 单片功率放大器 

分 类 号：TM933.1[电气工程—电力电子与电力传动]