用于小电流测量的Rogowski线圈电流互感器

ROGOWSKI COIL CURRENT TRANSDUCER FOR LOW AMPLITUDE CURRENT MEASUREMENT

在用 Rogowski线圈测量电流时 ,国外通常把小于 1 0 0 0 A的电流测量统称为小电流测量。当 Rogowski线圈测量小于 1 0 0 A电流时 ,线圈所感应出的电压信号极其微弱 (仅为几 m V到几十m V) ,易受干扰而很难准确测量 ,因此 ,电力系统中研制用于小于或等于 1 0 0 A电流的 Rogowski电流互感器一直是公认的一大难题。文中介绍了一种通过后续电路的处理来测量小电流的新型Rogowski电流互感器 ,给出了其基本原理、实现和频率响应特性 ,最后就额定电流为 1 0 0 A的Rogowski电流互感器给出了实验结果。实验数据证明 ,其精度达到了 0 .2级。这种方法在测量额定值为几十 A甚至几

Measuring current, which is less than 1 000 A, is usually called low amplitude current measurement overseas when using a Rogowski coil for the measurement of current. The voltage induced in the coil is very small (only several mV and several tens mV) and easily disturbed when the measured current is less than 100 A. The paper introduces a novel Rogowski coil current transducer to measure current which is less than 100 A by circuit disposing. The basic theory, the realization and the frequency responses are given. At last, test results of Rogowski current transducer, of which rated current is 100 A, prove the precision of the transducer to be grade 0.2. This method is valid when the measured current is less than 100A, even only several amperes.