Metodología para transmisión de trazabilidad de THDi en Analizadores de Calidad de Energía

Abstract

The equipment commonly used for monitoring voltage and current waveform distortion is known as a power quality analyzer. These devices are becoming increasingly important due to the incorporation of non-linear loads into distribution networks. At the regional level, there are no laboratories that have demonstrated technical competence in calibrating these devices. It is essential that network analyzers—or any other equipment used—justify the traceability of their measurements, as this allows for the demonstration of the reliability, comparability, and validity of the results. This work proposes distorting the current waveform using a luminous flux attenuator, a device that operates by clipping the voltage supply, enabling the measurement of THDi at ten different positions. Traceability is transmitted from a reference analyzer (AR) to an analyzer under calibration (AUC). To estimate the measurement uncertainty of the AUC, a mathematical model is developed based on the recommendations established by the Guide to the Expression of Uncertainty in Measurement (GUM) from the International Bureau of Weights and Measures (BIPM). The results show that it is possible to distort the current waveform within a THDi range of 8 % to 120 %, with an identified expanded uncertainty of 1.06e-6.