数字式检测装置相位误差量值溯源方法研究

Research on Method for Phase Accuracy Measurement Traceability of Digital Test Equipment

摘要: 当前智能变电站中大量使用电子式互感器与合并单元等智能设备，用于检测这些智能设备的主要有电子式互感器校验仪以及合并单元测试仪等。这些设备的准确度特性可使用电子式互感器校验仪整体检测装置对其进行检测，但该检测装置的准确度，特别是相位准确度尚无有效的方法溯源到现有的标准量值，导致现场运行的智能二次设备的量值溯源体系不完整，无法应用于电量的贸易结算。针对此情况，本文提出了一种用于校准数字式检测装置相位准确度的方法，该方法与现有基于数字微差源的方法相比，具有简便可行并可溯源的特点。该方法可将智能设备的相位准确度最终溯源到时间标准，完善了量值溯源体系，为智能设备科学准确的用于电能贸易结算提供技术依据值。

Abstract: Electronic instrument transformers (EIT) and merging units (MU) are widely utilized in the smart substations, and EIT testers and MU testers are used to test the accuracy of EITs and MUs. The EIT tester calibrator can calibrate the accuracy of the equipment. However, the accuracy of calibrator, especially the phase accuracy, cannot be traced to the existing standards due to the lack of appropriate method, thus causing the incompleteness of the accuracy tracing system. Therefore, the EITs and MUs running in the smart substations cannot be used as electric power measurement equipment. In order to solve this problem, a method to calibrate the phase accuracy of the digital equipment is proposed in this paper. Compared to the currently used method based on digital micro-difference source, this method can trace the phase accuracy of EITs and MUs to a precise time standard. This method provides the technical basis for the smart equipment’s utilization as metrological devices.