Mingotti Alessandro, Peretto Lorenzo, Tinarelli Roberto
Department of Electrical, Electronic and Information Engineering-Guglielmo Marconi, Alma Mater Studiorum-University of Bologna, Viale del Risorgimento, 240136 Bologna, Italy.
Sensors (Basel). 2020 Feb 20;20(4):1172. doi: 10.3390/s20041172.
The article presents a study on low-power voltage transformers (LPVTs). Considering their increasing spread among Smart Grids, it is fundamental to assess their accuracy behavior in as realistic conditions as possible. Therefore, this article presents a detailed calibration procedure to test LPVTs' accuracy when various external influence quantities are simultaneously acting on them. In the calibration procedure, the considered quantities are frequency, air temperature, and external electric field. Afterwards, the designed procedure is applied on three different off-the-shelf LPVTs using a measurement setup developed in a laboratory environment. The presented results (i) confirm the easy applicability of the designed calibration procedure; (ii) highlight the various effects of the influence quantities on the accuracy of different types of LPVTs; (iii) confirm the need to include more realistic tests, like the type-tests presented, into the standards to appreciate a wider set of possible in-field behaviors.
本文介绍了一项关于低功率电压互感器（LPVT）的研究。鉴于它们在智能电网中越来越广泛的应用，在尽可能真实的条件下评估其精度特性至关重要。因此，本文提出了一种详细的校准程序，用于在各种外部影响量同时作用于低功率电压互感器时测试其精度。在校准程序中，考虑的量为频率、空气温度和外部电场。之后，使用在实验室环境中开发的测量装置，将设计的程序应用于三个不同的现成低功率电压互感器。给出的结果：（i）证实了所设计校准程序易于应用；（ii）突出了影响量对不同类型低功率电压互感器精度的各种影响；（iii）确认有必要将更实际的测试（如本文提出的型式试验）纳入标准，以了解更广泛的可能现场行为。
