Electricity meter as a measuring device for harmonics content

Publikacja dotyczy możliwości zastosowania licznika energii elektrycznej do pomiarów zawartości harmonicznych napięcia oraz prądu, generowanych przez zasilacze urządzeń małej mocy przy czym licznik wykorzystano do pomiaru harmonicznych oraz współczynników THDU (ang. Total Harmonic Distortion, całkowity współczynnik odkształcenia napięcia) oraz THDI (całkowity współczynnik odkształcenia prądu).The article describes the possibility of using an electricity meter to measure both voltage and current harmonics content generated by power supplies for low power devices. The most frequently used single-phase DC power supplies were described and their influence on the supply network were tested. The following types of power supplies were checked: capacitive transformerless power supply, transformer power supply with Graetz rectifier and AC\DC switching power supply. All mentioned power supplies are non-linear load on the power grid, which causes the generation of a large content of harmonics in the supply current. This causes additional power losses in the power supply circuits. An EPS-type electricity meter manufactured by Pozyton was used for these measurements. Use of an electricity meter with harmonics content analyzer, provides better control over receivers operating in the network. Modern electricity meter makes it easy to maintain good power quality