Metrological Confirmation of Total Harmonic Distortion of Voltage Meters Used in Brazilian Electrical Power System

The widespread of power-electronic equipments in Brazilian electrical power system is provoking arise of a different type of disturbance that reduce the system’s power quality called harmonic distortion. The non-linear feature of these equipments is responsible for the injection of harmonic currents in the electric grid and thus causing the harmonic voltage distortion. In Brazil, there are standards, as Network Procedure 2.8 published by Brazilian Electricity Regulatory Agency (ANEEL), which establishes the limits for some power-quality parameters. The table 1 shows the lower global limits related to the harmonic voltage indices.