抗直流电流互感器校验仪检定方法研究

目前国内对于抗直流电流互感器校验仪的检定研究，除了正弦全波电流信号情况下的校验仪准确度计量可以通过整体检定方法得到传递外，对于正弦半波电流信号的测量，尚无专业校准设备可以完成。该文提出一种能满足正弦全波、全波带直流、正弦半波三种测试条件的抗直流互感器校验仪整体检定技术，分析抗直流互感器校验仪的工作原理和误差模型，特别对正弦半波工作电流情况下的校验仪误差检定和校准方法进行详细的研究，介绍该装置核心模块双路任意波程控信号源的工作机理和信号流程，并通过第三方测试设备对关键的谐波成份以及各种误差工况下的输出电流精度及稳定性进行测量和验证，对可能产生的装置不确定度进行了分析。测量结果证明，该文提出的整体检定技术达到预期效果，对于完善目前正在开展的抗直流互感器计量体系具有重要意义。

Research on verification method of anti-DC current transformer calibrator

At present, there is no professional calibration equipment for the calibration of anti-DC current transformer in China, except that the accuracy measurement of the calibrator under the condition of sinusoidal full-wave current signal can be transmitted by the overall calibration method. In this paper, an integrated calibration technology of anti-DC transformer calibrator which can satisfy three test conditions of sinusoidal full-wave, full-band direct current and sinusoidal half-wave is proposed. The working principle and error model of anti-DC transformer calibrator are analyzed. In particular, the calibration method of the calibrator under sinusoidal half-wave working current is studied in detail, and the dual-channel core module of the device is introduced. The working mechanism and signal flow of the program-controlled signal source are analyzed. The key harmonic components and the output current accuracy and stability under various error conditions are measured and verified by the third-party testing equipment. The possible uncertainty of the device is analyzed. The measurement results show that the overall verification technology proposed in this paper achieves the desired results and is of great significance for improving the current measurement system of anti-DC transformers.