On the feasibility on RM-A method for extended RMS measurements in the 9-500 kHz range   A. Gallarreta, J. González-Ramos, J. Vildósola, I. Fernández, I. Angulo, D. de la Vega and A. Arrinda   2024/07/20

Abstract

The conducted emissions in the 2-500 kHz range are widely known for prematurely age certain components of devices connected to the low-voltage (LV) distribution grid. The method described in IEC 61000-4-7 for the 2-9 kHz range is the only standardized technique that provides valid RMS results to assess the energy of the emissions, which is related to this phenomenon. Recently, the RM-A have been presented as an adaptation of the IEC 61000-4-7 to the 9-150 kHz band.

This paper analyzes the suitability of the extension of the RM-A method to the 9-500 kHz range and for 10 min measurements intervals. This work compares the performance of the RM-A method with respect to the IEC 61000-4-7 method, analyzing the deviations on the output spectral values and the execution performance of both methods. In this study, 30 recordings of 10 min length, taken in the LV grid, are processed with both methods to perform a statistical analysis of the deviations. The study shows that the RM-A method provides comparable RMS outputs to the IEC 61000-4-7, but requiring less computational burden and memory resources. Moreover, the RM-A spectra provides higher time and frequency resolution than the IEC 61000-4-7 due to its configuration.

Authors and affiliations

A. Gallarreta, J. González-Ramos, J. Vildósola, I. Fernández, I. Angulo, D. de la Vega and
A. Arrinda

University of the Basque Country (UPV/EHU). 48013 Bilbao (Spain)

Key words

Electromagnetic interference, measurement methods, power quality, power line communications, supraharmonic emissions.

References