影响间接接入式直流电能表计量准确性的相关研究

间接接入式直流电能表是直流充电、轨道交通等领域进行贸易结算不可或缺的器具，其通常搭配直流分流器使用。本文对该类型表的单独检定与整体检定试验进行了分析，得出了其误差受引线电阻与输入阻抗的影响较大的结论。提出了应将直流小信号输入阻抗纳入该类型表的型式评价考核项目，并最大限度地降低引线误差，以确保直流电能计量的准确性。

Research on the influence factors of the accuracy of indirected connected DC energy meter

Indirect connected DC energy meter is the indispensable apparatus for trade settlement in automobile charging, rail transit and other fields. It usually works with DC shunt. This paper analyses separate and integral calibration tests of this type of meter, and draws a conclusion that the error is greatly affected by the lead resistance and input impedance. It is proposed that the input impedance of DC small signal should be included in the type evaluation items of this type of meter, and the lead error should be minimized to ensure the accuracy of DC electric energy measurement.