电力系统合并单元测试仪测量误差检测校准装置 研制及性能分析

为推进智能变电站建设,针对合并单元测试仪测量误差缺少验证手段导致的电力系统合并单元等关键二次设备应用和推广受影响的问题,研制了一种针对合并单元测试仪测量误差开展检测校准的装置。首先,分析现有方法弊端,提出合并单元测试仪测量误差检测校准的整体思路,明确设计方案。其次,基于高精度硬件采集回路和高分辨率ADC同步采样技术,实现模拟信号高精度采样和数字信号高精度输出,解决了信号源的问题。最后,基于精确时间戳技术和采样值校正算法,实现A/D误差的高精度、宽量程模拟,该误差可作为合并单元测试仪测量的基准误差。试验及工程验证结果表明,新研制装置的采集输出、A/D误差模拟和抗干扰能力满足标准要求和应用需求,有效解决了合并单元测试仪测量误差无法检测校准的行业难题,填补空白,提高了检测校准能力和效率。

Development and performance analysis of a measurement error test and calibration device for a merging unit tester in a power system

There is a problem that the application and popularization of key secondary equipment such as a power system merging unit are affected by the lack of verification means for the measurement error of a merging unit tester. Thus a device for testing and calibrating such measurement error is developed. This is an important step in the promotion of intelligent substation construction. First, the disadvantages of the existing methods are analyzed. Then the overall idea of the measurement error test and calibration for the merging unit tester is proposed, and the design scheme is clarified. Secondly, based on a high-precision hardware acquisition loop and high-resolution ADC synchronous sampling technology, high-precision sampling of analog signal and high-precision output of the digital signal are realized to solve the problem of signal source. Finally, based on accurate timestamp technology and a sampling value correction algorithm, the high-precision and wide-range simulation of A/D error are realized as the reference error measured by the merging unit tester. Test and engineering verification results show that the acquisition output, A/D error simulation and anti-interference ability of the newly developed device meet the standard and application requirements, effectively solve the industry problem outlined above, and fill a gap, and improve test and calibration ability and efficiency. This work is supported by the National Natural Science Foundation of China (No. U1804252).