Exploration and Analysis of Traceability and Calibration Methods for DC Shunt Verification Devices

To ensure the effective traceability of DC shunt verification devices, thus guaranteeing the accuracy and reliability of both the device and the DC shunts it measures, this paper delineates the wide-range, high-current traceability relationships for DC energy. It introduces the working principles of each measuring instrument in the traceability chain, with a focus on the traceability standards and calibration methods of the DC shunt verification device. The paper also discusses and analyzes key technologies for precise measurement of large DC currents and small-signal DC voltages, such as precision I/V conversion and multiple-slope integral analog-to-digital conversion techniques. An example of uncertainty evaluation for measurement results is provided. The proposed methods offer technical support for the development of clean energy infrastructure and ensure fair energy trading. This field warrants further in-depth study based on the discussions and analyses presented.