作者：周力任, 潘洋, 朱力

作者单位：上海市计量测试技术研究院, 上海 201203

关键词：直流电流比较仪;传递比较法;参考绕组法;自校准;不确定度

摘要：

为提升磁调制式直流电流比较仪的性能，探索低磁势至额定磁势下的比例准确度，提出基于参考绕组法的自校准方法。分析含有参考绕组的DCC结构，通过测量独立的10组一次绕组与参考绕组和10组一次绕组串联后与二次绕组的差值电流，结合公式推导计算，得到一次绕组相对于参考绕组以及二次绕组的比例实际值和相应误差。测量结果的相对误差和不确定度都达到10^-8量级。采用具有溯源性的传递比较法对自校准结果进行验证，经过与上一级计量机构的测量结果和不确定度比较，满足JJF 1033-2016《计量标准考核规范》对测量结果验证的要求。基于参考绕组的DCC自校准方法具有测量结果不确定度小和测量过程简单的优点，满足直流电流比例溯源的要求。

Self-calibration of DC current ratio based on reference winding method
ZHOU Liren, PAN Yang, ZHU Li
Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China
Abstract: In order to improve the performance of DC current comparator (DCC) and explore the ratio accuracy between low magnetic potential to rated magnetic potential, a self-calibration method based on reference winding method was presented. The structure of DCC with reference winding was analyzed; the ratio actual value and corresponding error of primary winding against reference winding and secondary winding were finally obtained by measuring the difference current (the 10 groups of independent primary winding against the reference winding and the 10 groups primary winding in series against the secondary winding) and combining with formula deduction and calculation. The error and uncertainty of measurement results reached 10^-8 level. The transfer comparison method characterized by traceability was employed to verify the self-calibration results. It satisfied the requirement for measurement result verification proposed by JJF 1033-2016 Rule for the Examination of Measurement Standards through comparing the measurement results and uncertainties with the higher metrology institution. Self-calibration of DCC based on reference winding method can meet the requirements for DC current ratio traceability, with the advantages of small uncertainty and simple measurement process.
Keywords: DC current comparator;transfer comparison method;reference winding method;self-calibration;uncertainty
2019, 45(4):43-46  收稿日期: 2018-03-30;收到修改稿日期: 2018-04-28
基金项目: 国家质量监督检验检疫总局项目（2016QK117）
作者简介: 周力任(1985-),男,浙江宁波市人,高级工程师,硕士,主要从事高电压大电流计量的研究
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