Preliminary Observations of Supraharmonics in Low Voltage Networks

Supraharmonics (SH) are voltage and current components with frequencies greater than 2kHz. SH occur as a result of the operation of power electronic devices and propagate in networks, where such devices are supplied. Measurement of such components requires the use of specialized equipment and interpretation of measurement results requires the necessary knowledge and appropriate experience. The occurrence and propagation of SH in power grids are still poorly understood. The paper presents the results of SH measurements in supply circuits with low and high short circuit power. Measurements were made with the class A power quality analyzer PQ–Box 300 in the range from 2kHz to 170kHz.