一种高准确度电子补偿式电流比较仪

电流互感器(CT)被广泛应用于电流的比例变换,但其准确度一般难以优于0.01%。具有更高准确度的电流比例变换装置,例如双级电流互感器或补偿式电流比较仪,由于使用上的限制,一般只用于工频电流比例的量值溯源或量值传递。针对于此,研发出一种利用电子线路补偿铁心励磁电流的即所谓电子补偿式电流比较仪(ECCC)。文中阐述这种电流比较仪的基本原理,理论分析其误差性能,并进行了误差校准试验。试验结果表明,该ECCC的准确度满足0.000 5级要求,既可作为一种高准确度的电流比例标准,也可用于工频电流的高准确度测量。

A High Accuracy Current Comparator with Electronic Compensation

Current transformer ( CT ) has been widely used in current ratio transformation .Normally, its accuracy hardly exceeds 0.01%.Some more accurate current ratio transformer devices , such as two-stage current transformer and compensated current comparator , can only be used in the traceability or distribution area of current ratio quantity of power frequency due to some limitations .In view of this situation , a current comparator with electronic compensa-tion ( ECCC) using electronic circuit to compensate the magnetizing current of the core was developed .The principle , theoretical analysis of the error , and the calibration tests are presented in the paper .The results showed that the EC-CC fulfills the requirements of the accuracy class of 0 .0005 .It can be used either as a high accuracy current ratio standard , or a normal CT in power frequency current measurement where high accuracy is needed .