Mingotti Alessandro, Costa Federica, Peretto Lorenzo, Tinarelli Roberto
Department of Electrical, Electronic and Information Engineering, Guglielmo Marconi Alma Mater Studiorum, University of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy.
Sensors (Basel). 2022 Jan 5;22(1):397. doi: 10.3390/s22010397.
Power quality evaluation is the process of assessing the actual power network parameters with respect to the ideal conditions. However, several new assets and devices among the grid include mining the voltage and current quality. For example, the power converters needed for renewable energy sources' connection to the grid, electric vehicles, etc., are some of the main sources of disturbances that inject high-frequency components into the grid. Consequently, instrument transformers (ITs) should be capable of measuring distorted currents and voltages with the same level of accuracy guaranteed for the ideal frequency (50-60 Hz). This is not a simple task if one considers that several other influence quantities endlessly act on the ITs. To this purpose, considering the lack of a standard, this work presents a measurement setup and specific tests for testing a commonly used type of low-power current transformer, the Rogowski coil (RC). In particular, the accuracy performance (ratio error and phase displacement) of the RCs was evaluated when measuring distorted signals while other influence quantities affected the RCs. Such quantities included positioning, burden, and magnetic field. The results indicate which quantities (or combination of them) have the greatest effect on the RC's accuracy performance.
电能质量评估是相对于理想条件评估实际电网参数的过程。然而，电网中的一些新资产和设备包括挖掘电压和电流质量。例如，可再生能源接入电网所需的功率转换器、电动汽车等，是向电网注入高频分量的一些主要干扰源。因此，仪表变压器（ITs）应能够以与理想频率（50 - 60Hz）相同的精度保证水平测量失真的电流和电压。如果考虑到其他几个影响量无休止地作用于仪表变压器，这并非一项简单的任务。为此，考虑到缺乏标准，这项工作提出了一种测量装置和特定测试，用于测试一种常用的低功率电流互感器——罗戈夫斯基线圈（RC）。特别是，在测量失真信号时，当其他影响量作用于罗戈夫斯基线圈时，评估了其精度性能（变比误差和相位移）。这些量包括位置、负载和磁场。结果表明哪些量（或它们的组合）对罗戈夫斯基线圈的精度性能影响最大。
