Enhancement of Reference Power Standard at SASO NMCC on AC power And revaluation of measurement uncertainty

NMCC-SASO Saudi Arabia

^* Corresponding author: s.mojaewel@saso.gov.sa

Published online: 7 April 2025

Abstract

The accuracy and reliability of Power Standards for AC power measurements are significant subjects in current times and for the future. The rapid increase in smart electricity meters in Saudi Arabia necessitates the development of an NMCC (National Metrology and Calibration Center) reference power standard to meet legal metrology and industrial requirements. This study explores advancements in reference power standards, specifically focusing on the development of more precise and stable AC power measurement systems for high-current applications. The results demonstrate a significant reduction in the estimated uncertainty, leading to more accurate calibration of power meters. In a parallel case study, a calibration method is applied to a commercial power meter to measure AC power across high current values ranging from 10 A to 120 A using Refernce CT. The calibration method involves comparing the reference AC power system with the commercial power meter. The term ‘DSWM’ (Digital Sampling Watt Meter) refers to the reference AC power system, which utilizes sampling techniques to collect various data with a Unit under Calibration (UUC). Homemade software under the environment of LabVIEW software is used to controlling, optimizing, handling the data, statistically calculation and finally for exporting the well gathering data in the form in digitized certificates. The paper explains the components of the DSWM, the measurement results for AC power are presented, considering active and reactive power, which may impact various aspects such as voltage, current, and phase measurements. The evaluation of uncertainty was 40 μW/V.A for active power and 40 μvar/V.A for reactive power. Finally, the paper mentions future work in its concluding section.