适合高精度关口电能表检定的小电流标准功率源设计

Design of Low Current Standard Power Source for High-Precision Gateway Watt-Hour Meter Verification

针对高精度关口电能表检定中0.3 A小电流输出准确度低的问题,提出基于跨阻负反馈的小电流输出方案,设计反馈测量模块和噪声滤波单元,研制一种小电流标准功率源。实验结果表明所设计的小电流标准功率源稳定可靠,解决了0.3 A及以上关口电能表小电流点检定溯源问题。

In order to solve the problem that the accuracy of 0.3 A low current output is low in the verification of high precision gateway watt-hour meter,a low current output scheme based on trans-resistance negative feedback is proposed,and the feedback measurement module and noise filtering unit are designed,a low current standard power source is developed.The experimental results show that the designed small current standard power source is stable and reliable,and the problem of verification and tracing of small current points in 0.3 A and above gateway meter is solved.