Calibration Procedure to Test the Effects of Multiple Influence Quantities on Low-Power Voltage Transformers

Abstract

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.

Accuracy Type Test for Rogowski Coils Subjected to Distorted Signals, Temperature, Humidity, and Position Variations

“…In [ 27 ], the authors studied the calibration of direct current (DC) current transformers (CT); while in [ 28 ] it was conducted for digital ITs. A calibration procedure for legacy CTs was presented in [ 29 ], while different kinds of LPITs were calibrated in [ 30 , 31 , 32 ]. All of these works were extremely important for enhancing knowledge of ITs.…”

3D Electromagnetic Field Analysis Applied to Evaluate the Accuracy of a Voltage Transformer under Distorted Voltage

“…Measurement methods and systems for determining the transformation errors of current and voltage transformers based on various principles are described in the literature [15][16][17].…”